From e0c6872cf40896c7be36b11dcc744620f10adf1d Mon Sep 17 00:00:00 2001
From: Norbert Preining <norbert@preining.info>
Date: Mon, 2 Sep 2019 13:46:59 +0900
Subject: Initial commit

---
 macros/generic/tracklang/tracklang.dtx | 10870 +++++++++++++++++++++++++++++++
 1 file changed, 10870 insertions(+)
 create mode 100644 macros/generic/tracklang/tracklang.dtx

(limited to 'macros/generic/tracklang/tracklang.dtx')

diff --git a/macros/generic/tracklang/tracklang.dtx b/macros/generic/tracklang/tracklang.dtx
new file mode 100644
index 0000000000..1768bcc3ce
--- /dev/null
+++ b/macros/generic/tracklang/tracklang.dtx
@@ -0,0 +1,10870 @@
+%\iffalse
+% tracklang.dtx generated using makedtx version 1.2 (c) Nicola Talbot
+% Command line args:
+%   -doc "tracklang-manual.tex"
+%   -section "chapter"
+%   -src "tracklang.sty\Z=>tracklang.sty"
+%   -src "tracklang.tex\Z=>tracklang.tex"
+%   -src "tracklang-region-codes.tex\Z=>tracklang-region-codes.tex"
+%   -src "tracklang-scripts.sty\Z=>tracklang-scripts.sty"
+%   -src "tracklang-scripts.tex\Z=>tracklang-scripts.tex"
+%   -author "Nicola Talbot"
+%   tracklang
+% Created on 2019/8/31 16:29
+%\fi
+%\iffalse
+%<*package>
+%% \CharacterTable
+%%  {Upper-case    \A\B\C\D\E\F\G\H\I\J\K\L\M\N\O\P\Q\R\S\T\U\V\W\X\Y\Z
+%%   Lower-case    \a\b\c\d\e\f\g\h\i\j\k\l\m\n\o\p\q\r\s\t\u\v\w\x\y\z
+%%   Digits        \0\1\2\3\4\5\6\7\8\9
+%%   Exclamation   \!     Double quote  \"     Hash (number) \#
+%%   Dollar        \$     Percent       \%     Ampersand     \&
+%%   Acute accent  \'     Left paren    \(     Right paren   \)
+%%   Asterisk      \*     Plus          \+     Comma         \,
+%%   Minus         \-     Point         \.     Solidus       \/
+%%   Colon         \:     Semicolon     \;     Less than     \<
+%%   Equals        \=     Greater than  \>     Question mark \?
+%%   Commercial at \@     Left bracket  \[     Backslash     \\
+%%   Right bracket \]     Circumflex    \^     Underscore    \_
+%%   Grave accent  \`     Left brace    \{     Vertical bar  \|
+%%   Right brace   \}     Tilde         \~}
+%</package>
+%\fi
+% \iffalse
+% Doc-Source file to use with LaTeX2e
+% Copyright (C) 2019 Nicola Talbot, all rights reserved.
+% \fi
+% \iffalse
+%<*driver>
+\documentclass[report,inlinetitle]{nlctdoc}
+
+\DeleteShortVerb{|}
+
+\usepackage[a4paper,marginpar=2in,marginparsep=10pt,
+ left=2in,right=.5in]{geometry}
+\usepackage{graphicx}
+\usepackage[utf8]{inputenc}
+\usepackage[T1]{fontenc}
+\usepackage{tracklang}
+\usepackage{etoolbox}
+\usepackage{longtable}
+\usepackage{datatool-base}[2016/07/20]
+\let\orgtheindex\theindex
+\let\orgendtheindex\endtheindex
+\usepackage{imakeidx}
+\usepackage[colorlinks,
+            bookmarks,
+            hyperindex=false,
+            pdfauthor={Nicola L.C. Talbot},
+            pdftitle={tracklang: tracking language options}]{hyperref}
+
+\CheckSum{3961}
+
+\appto\MacroFont{\scriptsize}
+\renewcommand*{\usage}[1]{\textit{\hyperpage{#1}}}
+\renewcommand*{\main}[1]{\underline{\hyperpage{#1}}}
+\PageIndex
+\setcounter{IndexColumns}{2}
+\newcommand*{\PrintCodeIndex}{%
+ \bgroup
+  \let\theindex\orgtheindex
+  \let\endtheindex\orgendtheindex
+  \PrintIndex
+ \egroup
+}
+\IndexPrologue{%
+\clearpage\phantomsection
+\addcontentsline{toc}{chapter}{Code Index}%
+\chapter*{Code Index}\markboth{Code Index}{Code Index}%
+}
+
+\makeindex[name=user,title=Main Index,intoc]
+\renewcommand{\iapp}[1]{\index[user]{#1@\appfmt{#1}|hyperpage}}
+\renewcommand{\iterm}[1]{\index[user]{#1|hyperpage}}
+\renewcommand{\ics}[1]{\cs{#1}\index[user]{#1@\protect\cs{#1}|hyperpage}}
+\renewcommand*{\ipkgopt}[2][]{%
+ \ifstrempty{#1}%
+ {\index[user]{package options:!#2@\pkgoptfmt{#2}|hyperpage}}%
+ {\index[user]{package options:!#2@\pkgoptfmt{#2}!#1@\pkgoptfmt{#1}|hyperpage}}%
+}
+\renewcommand*{\pkgopt}[2][]{%
+ \pkgoptfmt{#2}\ifstrempty{#1}%
+ {\index[user]{package options:!#2@\pkgoptfmt{#2}|hyperpage}}%
+ {\index[user]{package options:!#2@\pkgoptfmt{#2}!#1@\pkgoptfmt{#1}|hyperpage}}%
+}
+\renewcommand*{\isty}[1]{%
+ \index[user]{#1 package@\styfmt{#1} package|hyperpage}}
+
+\newcommand*{\envvar}[1]{%
+ \texttt{#1}%
+ \index[user]{#1@\texttt{#1}}}
+
+\newcommand*{\isopkgopts}{}
+\newcommand*{\nonisopkgopts}{}
+\newcommand*{\rootlangopts}{}
+
+\makeatletter
+\renewcommand*{\changes@}[3]{%
+  \protected@edef\@tempa{\noexpand\glossary{#1 (#2)\levelchar
+                                 \ifx\saved@macroname\@empty
+                                   \space
+                                   \actualchar
+                                   \generalname
+                                 \else
+                                   \expandafter\@gobble
+                                   \saved@macroname
+                                   \actualchar
+                                   \string\verb\quotechar*%
+                                   \verbatimchar\saved@macroname
+                                   \verbatimchar
+                                 \fi
+                                 :\levelchar #3\encapchar hyperpage}}%
+  \@tempa\endgroup\@esphack}
+
+
+\ifdim\overfullrule=0pt\relax % final mode
+  \typeout{Sorting available options. This may take a while.}%
+  \newcommand{\addopt}[3]{%
+    \expandafter\dtlinsertinto\expandafter{#1}{#2}{#3}%
+  }%
+\else
+  \newcommand{\addopt}[3]{%
+    \ifdefempty{#2}{\edef#2{#1}}{\eappto{#2}{,#1}}
+  }
+\fi
+
+
+\@for\thisdialect:=\@tracklang@declaredoptions\do{%
+  \ifdefempty\thisdialect
+  {}%
+  {%
+    \typeout{\thisdialect}%
+    \ifnum\pdfmatch {[a-z]{2,3}-[A-Z]{2}}{\thisdialect}=1\relax
+      \addopt{\thisdialect}{\isopkgopts}{\dtlcompare}%
+    \else
+      \TrackLangIfKnownLang{\thisdialect}
+      {%
+        \addopt{\thisdialect}{\rootlangopts}{\dtlcompare}%
+      }%
+      {%
+        \addopt{\thisdialect}{\nonisopkgopts}{\dtlicompare}%
+      }%
+    \fi
+  }%
+}
+
+\newcommand*{\isopkgoptstab}{\begin{table}[p]
+\caption[Predefined ISO Language-Region Dialects]%
+{Predefined ISO Language-Region Dialects. (May be used as a package
+option or with \cs{TrackPredefinedDialect}.)}\label{tab:isoopts}
+\medskip
+\centering
+\begin{tabular}{llll}%
+}
+
+\newcommand*{\fnregion}{\textsuperscript{\textdagger}}
+
+\newcommand*{\rootlangoptstab}{\begin{longtable}{lll}
+\caption[Predefined Root Languages]{Predefined Root Languages.
+(\fnregion Has an associated territory.)
+The corresponding
+language tag obtained with \cs{GetTrackedLanguageTag}\marg{dialect}
+is shown in parentheses.}\label{tab:rootlangopts}\\\endfirsthead
+\caption[]{Predefined Root Languages Continued.}\\\endhead
+}
+
+\newcommand*{\nonisopkgoptstab}{\begin{longtable}{ll}
+\caption[Predefined Non-ISO Dialects]{Predefined Non-ISO Dialects.
+(\fnregion Has an associated territory.)
+The corresponding
+language tag obtained with \cs{GetTrackedLanguageTag}\marg{dialect}
+is shown in parentheses. If the dialect has a corresponding mapping
+for the closest matching non-root language \cs{caption\ldots} or
+\cs{date\ldots}, this is also include after the tag following a
+slash.}%
+\label{tab:nonisoopts}\\\endfirsthead
+\caption[]{Predefined Non-ISO Dialects Continued}\\\endhead
+}
+
+\newcount\tmpctr
+
+\@for\thisdialect:=\isopkgopts\do{%
+  \advance\tmpctr by 1\relax  
+  \eappto\isopkgoptstab{\noexpand\pkgoptfmt{\thisdialect}&}%
+  {%locally track this dialect to pick up information
+    \TrackPredefinedDialect\thisdialect
+    \xappto\isopkgoptstab{\space
+     {\noexpand\small(\noexpand\texttt{%
+       \csname @tracklang@dialect\endcsname})}}%
+  }%
+  \ifnum\tmpctr>1
+    \tmpctr = 0\relax
+    \appto\isopkgoptstab{\\}%
+  \else
+    \appto\isopkgoptstab{&}%
+  \fi
+}
+
+\appto\isopkgoptstab{\end{tabular}\par
+\medskip
+Other combinations need to be set with \cs{TrackLocale} or
+\cs{TrackLanguageTag}.
+\end{table}}
+
+\tmpctr=0\relax
+
+\@for\thisdialect:=\nonisopkgopts\do{%
+  \advance\tmpctr by 1\relax  
+  \eappto\nonisopkgoptstab{\noexpand\pkgoptfmt{\thisdialect}}%
+  {%locally track this dialect to pick up information
+    \TrackPredefinedDialect\thisdialect
+    \IfTrackedLanguageHasIsoCode{3166-1}{\thisdialect}%
+    {\gappto\nonisopkgoptstab{\fnregion}}%
+    {}%
+    \IfTrackedDialectHasMapping\thisdialect
+    {\def\nonisopkgmap{ / 
+      \noexpand\texttt{\GetTrackedDialectToMapping\thisdialect}}}%
+    {\def\nonisopkgmap{}}%
+    \xappto\nonisopkgoptstab{\space
+     {\noexpand\small(\noexpand\texttt{\GetTrackedLanguageTag\thisdialect}%
+      \nonisopkgmap)}}%
+  }%
+  \ifnum\tmpctr>1
+    \tmpctr = 0\relax
+    \appto\nonisopkgoptstab{\\}%
+  \else
+    \appto\nonisopkgoptstab{&}%
+  \fi
+}
+
+\appto\nonisopkgoptstab{\end{longtable}}
+
+\tmpctr=0\relax
+
+\@for\thisdialect:=\rootlangopts\do{%
+  \advance\tmpctr by 1\relax  
+  \eappto\rootlangoptstab{\noexpand\pkgoptfmt{\thisdialect}}%
+  \TrackLangIfHasKnownCountry{\thisdialect}%
+  {%
+    \appto\rootlangoptstab{\fnregion}%
+  }%
+  {}%
+  {%locally track this language to pick up information
+    \TrackPredefinedDialect\thisdialect
+    \xappto\rootlangoptstab{\space
+     {\noexpand\small(\noexpand\texttt{\GetTrackedLanguageTag\thisdialect})}}%
+  }%
+  \ifnum\tmpctr>2
+    \tmpctr = 0\relax
+    \appto\rootlangoptstab{\\}%
+  \else
+    \appto\rootlangoptstab{&}%
+  \fi
+}
+
+\appto\rootlangoptstab{\end{longtable}}
+
+\makeatother
+
+\newcommand*{\refoptstables}{tables~\ref{tab:isoopts}, \ref{tab:rootlangopts}
+and~\ref{tab:nonisoopts}}
+
+\begin{document}
+\DocInput{tracklang.dtx}
+\end{document}
+%</driver>
+%\fi
+%
+%\MakeShortVerb{"}
+%
+%\title{tracklang v1.3.7:
+%tracking language options}
+%\author{Nicola L. C. Talbot\\\url{http://www.dickimaw-books.com/}}
+%
+%\date{2019-08-31}
+%\maketitle
+%
+%\begin{abstract}
+%The \styfmt{tracklang} package is provided for package developers
+%who want a simple interface to find out which languages the user has
+%requested through packages such as \sty{babel} and
+%\sty{polyglossia}. \emph{This package doesn't provide any
+%translations.}
+%Its purpose is simply to track which languages have been requested by the
+%user. Generic \TeX\ code is in \texttt{tracklang.tex} for
+%non-\LaTeX\ users.
+%
+%If the shell escape is enabled or \ics{directlua} is available,
+%this package may also be used to query the \envvar{LC\_ALL}
+%or \envvar{LANG} environment variable (see
+%\sectionref{sec:langsty}). Windows users, who don't have the locale
+%stored in environment variables, can use \app{texosquery}
+%in combination with \styfmt{tracklang}. (Similarly if \envvar{LC\_ALL}
+%or \envvar{LANG} don't contain sufficient information.) In order to
+%use \app{texosquery} through the restricted shell escape, you must
+%have at least Java~8 and set up \texttt{texosquery.cfg}
+%appropriately. (See the \app{texosquery} manual for further details.)
+%\end{abstract}
+%
+%The fundamental aim of this generic package is to be able to
+%effectively say:
+%\begin{quote}
+%The user (that is, the \emph{document} author) wants to use
+%dialects \texttt{xx-XX}, \texttt{yy-YY-Scrp}, etc in their
+%document. Any packages used by their document that provide 
+%multilingual or region-dependent support should do whatever is
+%required to activate the settings for those languages and regions
+%(or warn the user that there's no support).
+%\end{quote}
+%Naturally, this is only of use if the locale-sensitive packages use
+%\styfmt{tracklang} to pick up this information, which is entirely up
+%to the package authors, but at the moment there's no standard method
+%for packages to detect the required language and region. The aim of
+%\styfmt{tracklang} is to provide that method.
+%
+%Related article: \qt{Localisation of \TeX\ documents: 
+%\styfmt{tracklang}.} TUGBoat, Volume~37 (2016), No.~3
+%(\url{http://www.tug.org/TUGboat/tb37-3/tb117talbot.pdf}).
+%
+%\clearpage
+%\tableofcontents
+%\clearpage\phantomsection
+%\pdfbookmark{Tables}{lot}%
+%\listoftables
+%
+%\chapter{Introduction}
+%\label{sec:intro}
+%
+%When I'm developing a package that provides multilingual support
+%(for example, \styfmt{glossaries}) it's cumbersome trying to work out
+%if the user has requested translations for fixed text.  This usually
+%involves checking if \sty{babel} or \sty{ngerman} or
+%\sty{translator} or \sty{polyglossia} has been loaded and, if so,
+%what language settings have been used. The result can be a tangled
+%mass of conditional code. The alternative is to tell users to add
+%the language as a~document class option, which they may or may not
+%want to do, or to tell them to supply the language settings to every
+%package they load that provides multilingual support, which users
+%are even less likely to want to do.
+%
+%The \styfmt{tracklang} package tries to neaten this up by working out
+%as much of this information as possible for you and providing a
+%command that iterates through the loaded languages. This way, you
+%can just iterate through the list of tracked languages and, for each
+%language, either define the translations or warn the user that
+%there's no translation for that language.
+%
+%This package works best with \sty{ngerman} or with recent versions
+%of \sty{babel} or when the language options are specified
+%in the document class option list. It works fairly well with
+%\sty{translator} but will additionally assume the root language was
+%also requested when a dialect is specified. So, for example,
+%\begin{verbatim}
+%\usepackage[british]{translator}
+%\usepackage{tracklang}
+%\end{verbatim}
+%is equivalent to
+%\begin{verbatim}
+%\usepackage[british]{translator}
+%\usepackage[english,british]{tracklang}
+%\end{verbatim}
+%This means that \ics{ForEachTrackedDialect} will iterate
+%through the list \qt{english,british} instead of just
+%\qt{british}, which can result in some redundancy.
+%
+%Unfortunately I can't work out how to pick up the language variant
+%or script from \sty{polyglossia}, so only the root languages are detected,
+%which is suboptimal but at least provides some information.
+%(\sty{polyglossia} now provides \cs{xpg@loaded}, which
+%\sty{tracklang} uses to track the root languages, but the language variant
+%command \cs{xpg@vloaded} only seems to be set when the language
+%changes, which doesn't occur until the start of the \env{document}
+%environment.)
+%
+%If the \sty{ngerman} package has been loaded, \styfmt{tracklang}
+%effectively does
+%\begin{verbatim}
+%\TrackPredefinedDialect{ngerman}
+%\end{verbatim}
+%Similarly, if the \sty{german} package has been loaded, 
+%\styfmt{tracklang} effectively does
+%\begin{verbatim}
+%\TrackPredefinedDialect{german}
+%\end{verbatim}
+%
+%If any document class or package options are passed to
+%\styfmt{tracklang}, then \styfmt{tracklang} won't bother checking
+%for \sty{babel}, \sty{translator}, \sty{ngerman}, \sty{german} or
+%\sty{polyglossia}. So, if the above example is changed to:
+%\begin{verbatim}
+%\documentclass[british]{article}
+%\usepackage{translator}
+%\usepackage{tracklang}
+%\end{verbatim}
+%then the dialect list will just consist of \qt{british} rather than
+%\qt{english,british}. This does, however, mean that if the user mixes
+%class and package options, only the class options will be detected.
+%For example:
+%\begin{verbatim}
+%\documentclass[british]{article}
+%\usepackage[french]{babel}
+%\usepackage{tracklang}
+%\end{verbatim}
+%In this case, only the \qt{british} option will be detected. The user
+%can therefore use the document class option (or \styfmt{tracklang}
+%package option) to override the dialect and set the country code
+%(where provided). For example:
+%\begin{verbatim}
+%\documentclass[es-MX]{article}
+%\usepackage[spanish]{babel}
+%\usepackage{tracklang}
+%\end{verbatim}
+%This sets the dialect to \qt{mexicanspanish} and the root language to
+%\qt{spanish}. 
+%
+%Predefined dialects are listed in \refoptstables. These may be 
+%passed in the document class options or
+%used in \ics{TrackPredefinedDialect}, as illustrated above. 
+%
+%\sectionref{sec:summary} provides brief examples of use for those
+%who want a general overview before reading the more detailed
+%sections.
+%\sectionref{sec:generic} describes generic commands for
+%identifying the document languages.
+%\sectionref{sec:user} is for package writers who want to
+%add multilingual support to their package and need to know which
+%settings the user has requested through language packages like
+%\sty{babel}. \sectionref{sec:langsty} is for
+%developers of language definition packages who want to help other
+%package writers to detect what languages have been requested.
+%
+%\isopkgoptstab
+%
+%\clearpage
+%
+%\rootlangoptstab
+%
+%\clearpage
+%
+%\nonisopkgoptstab
+%
+%\chapter{Summary of Use}
+%\label{sec:summary}
+%
+%There are three levels of use:
+%\begin{enumerate}
+%\item document level (code used by document authors);
+%\item locale-sensitive package level 
+%(code for package authors who need to 
+%know what languages or locale the document is
+%using, such as \styfmt{glossaries} to translate commands like
+%\cs{descriptionname} or \styfmt{datetime2} to provide localised 
+%formats or time zone information);
+%\item language set-up level (code for packages that set up
+%the document languages, such as \sty{babel} or \sty{polyglossia}).
+%\end{enumerate}
+%
+%\section{Document Level}
+%\label{sec:summary-doc}
+%
+%\subsection{Generic \texorpdfstring{\TeX}{TeX}}
+%Unix user wants the locale information picked up from the 
+%locale environment variable:
+%\begin{verbatim}
+%\input tracklang % v1.3
+%\TrackLangFromEnv
+%% load packages that use tracklang for localisation
+%\end{verbatim}
+%
+%Windows user wants the locale information picked up from the 
+%operating system:
+%\begin{verbatim}
+%\input texosquery
+%\input tracklang %v1.3
+%\TrackLangFromEnv
+%% load packages that use tracklang for localisation
+%\end{verbatim}
+%Or (\sty{texosquery} v1.2 currently pending)
+%\begin{verbatim}
+%\input texosquery % v1.2
+%\input tracklang % v1.3
+%
+%\TeXOSQueryLangTag{\langtag}
+%\TrackLanguageTag{\langtag}
+%% load packages that use tracklang for localisation
+%\end{verbatim}
+%Anticipate the release of \styfmt{texosquery} v1.2:
+%\begin{verbatim}
+%\input texosquery
+%\input tracklang % v1.3
+%
+%\ifx\TeXOSQueryLangTag\undefined
+% \TrackLangFromEnv
+%\else
+% \TeXOSQueryLangTag{\langtag}
+% \TrackLanguageTag{\langtag}
+%\fi
+%% load packages that use tracklang for localisation
+%\end{verbatim}
+%
+%User is writing in Italy in Armenian with a Latin
+%script and the arevela variant:
+%\begin{verbatim}
+%\input tracklang % v1.3
+%\TrackLanguageTag{hy-Latn-IT-arevela}
+%% load packages that use tracklang for localisation
+%\end{verbatim}
+%
+%User is writing in English in the UK:
+%\begin{verbatim}
+%\input tracklang
+%\TrackPredefinedDialect{british}
+%% load packages that use tracklang for localisation
+%\end{verbatim}
+%
+%Find out information about the current language (supplied
+%in \cs{languagename}):
+%\begin{verbatim}
+%\SetCurrentTrackedDialect{\languagename}
+%Dialect: \CurrentTrackedDialect.
+%Language: \CurrentTrackedLanguage.
+%ISO Code: \CurrentTrackedIsoCode.
+%Region: \CurrentTrackedRegion.
+%Modifier: \CurrentTrackedDialectModifier.
+%Variant: \CurrentTrackedDialectVariant.
+%Script: \CurrentTrackedDialectScript.
+%Sub-Lang: \CurrentTrackedDialectSubLang.
+%Additional: \CurrentTrackedDialectAdditional.
+%Language Tag: \CurrentTrackedLanguageTag.
+%\end{verbatim}
+%Additional information about the script can be obtained by
+%also loading \sty{tracklang-scripts}:
+%\begin{verbatim}
+%\input tracklang-scripts
+%\end{verbatim}
+%The name, numeric code and direction can now be obtained:
+%\begin{verbatim}
+%Name: \TrackLangScriptAlphaToName{\CurrentTrackedDialectScript}.
+%Numeric: \TrackLangScriptAlphaToNumeric{\CurrentTrackedDialectScript}.
+%Dir: \TrackLangScriptAlphaToDir{\CurrentTrackedDialectScript}.
+%\end{verbatim}
+%Test for a specific script:
+%\begin{verbatim}
+%Latin?
+%\ifx\CurrentTrackedDialectScript\TrackLangScriptLatn
+% Yes
+%\else
+% No
+%\fi
+%\end{verbatim}
+%
+%\subsection{\texorpdfstring{\LaTeX}{LaTeX}}
+%
+%For \sty{babel} users where the supplied \sty{babel} dialect
+%label is sufficient, there's no need to do anything special:
+%\begin{verbatim}
+%\documentclass[british,canadien]{article}
+%\usepackage[T1]{fontenc}
+%\usepackage{babel}
+%% load packages that use tracklang for localisation
+%\end{verbatim}
+%If the region is important but there's no \sty{babel} dialect
+%that represents it, there are several options.
+%
+%Use the class options recognised by \styfmt{tracklang}
+%and the root language labels when loading \sty{babel}:
+%\begin{verbatim}
+%\documentclass[en-IE,ga-IE]{article}
+%\usepackage[english,irish]{babel}
+%% load packages that use tracklang for localisation
+%\end{verbatim}
+%
+%This method is needed for \sty{polyglossia} where the regional
+%information is required. For example
+%\begin{verbatim}
+%\documentclass[en-GB]{article}
+%\usepackage{polyglossia}
+%\setmainlanguage[variant=uk]{english}
+%% load packages that use tracklang for localisation
+%\end{verbatim}
+%
+%Another method with \sty{babel} is to
+%use \cs{TrackLanguageTag} and map the new dialect label to
+%\sty{babel}'s nearest matching label:
+%\begin{verbatim}
+%\documentclass{article}
+%
+%\usepackage{tracklang}% v1.3
+%\TrackLanguageTag{en-MT}
+%\SetTrackedDialectLabelMap{\TrackLangLastTrackedDialect}{UKenglish}
+%
+%\usepackage[UKenglish]{babel}
+%% load packages that use tracklang for localisation
+%\end{verbatim}
+%This ensures that the \cs{captionsUKenglish} hook is detected
+%by the localisation packages. This mapping isn't needed
+%for \sty{polyglossia} as the caption hooks use the root language
+%label. This mapping also isn't needed if \texttt{british} is used
+%instead of \texttt{UKenglish} since the \pkgopt{en-MT}
+%(\pkgopt{maltaenglish})
+%predefined dialect automatically sets up a mapping to
+%\texttt{british}. (The default mappings are shown in
+%\tableref{tab:nonisoopts}.)
+%
+%\section{Locale-Sensitive Packages}
+%\label{sec:summary-localepkg}
+%
+%Let's suppose you are developing a package called 
+%\texttt{mypackage.sty} or \texttt{mypackage.tex} and you want
+%to find out what languages the document author has requested.
+%
+%Generic use:
+%\begin{verbatim}
+%\input tracklang 
+%\end{verbatim}
+%(Most of the commands used in this section require at least
+%\styfmt{tracklang} version 1.3.)
+%Note that \texttt{tracklang.tex} has a check to determine if
+%it's already been loaded, so you don't need to worry about that.
+%
+%\LaTeX\ use:
+%\begin{verbatim}
+%\RequirePackage{tracklang}[2016/10/07]% at least v1.3
+%\end{verbatim}
+%This will picked up any language options supplied in the document
+%class options and will also detect if \sty{babel} or
+%\sty{polyglossia} have been loaded.
+%
+%(\LaTeX) If you want to allow the user to set the locale in the 
+%package options:
+%\begin{verbatim}
+%\DeclareOption*{\TrackLanguageTag{\CurrentOption}}
+%\end{verbatim}
+%This means the user can do, say,
+%\begin{verbatim}
+%\usepackage[hy-Latn-IT-arevela]{mypackage}
+%\end{verbatim}
+%The rest of the example package in this section uses generic code.
+%
+%If you want to fetch the locale information from the operating
+%system when the user hasn't requested a language:
+%\begin{verbatim}
+%\AnyTrackedLanguages
+%{}
+%{% fetch locale information from the operating system
+%  \ifx\TeXOSQueryLangTag\undefined
+%    % texosquery v1.2 not available
+%    \TrackLangFromEnv
+%  \else
+%    % texosquery v1.2 available
+%    \TeXOSQueryLangTag{\langtag}
+%    \TrackLanguageTag{\langtag}
+%  \fi
+%}
+%\end{verbatim}
+%
+%Set up the defaults if necessary:
+%\begin{verbatim}
+%\def\fooname{Foo}
+%\def\barname{Bar}
+%\end{verbatim}
+%
+%Now load the resource files:
+%\begin{verbatim}
+%\AnyTrackedLanguages
+%{%
+%  \ForEachTrackedDialect{\thisdialect}{%
+%    \TrackLangRequireDialect{mypackage}{\thisdialect}%
+%  }%
+%}
+%{}% no tracked languages, default already set up
+%\end{verbatim}
+%
+%Each resource file has the naming scheme \meta{prefix}\texttt{-}
+%\meta{tag}\texttt{.ldf}. In this example, the \meta{prefix} is
+%\texttt{mypackage}. The \meta{tag} may be the language or dialect label
+%(for example, \texttt{english} or \texttt{british}) or a combination of the ISO
+%language and region codes (for example, \texttt{en-GB} or 
+%\texttt{en} or \texttt{GB}).
+%
+%The simplest scheme is to use the root language label (not the
+%dialect label) for the base language settings and use the ISO
+%codes for regional support.
+%
+%For example, the file \texttt{mypackage-english.ldf}:
+%\begin{verbatim}
+%\TrackLangProvidesResource{english}[2016/10/06 v1.0]% identify this file
+%
+%\TrackLangAddToCaptions{%
+%  \def\fooname{Foo}%
+%  \def\barname{Bar}%
+%}
+%\end{verbatim}
+%This sets up appropriate the \cs{captions\ldots} hook (if it's
+%found). For other hooks, such as \cs{date\ldots}, use 
+%\ics{TrackLangAddToHook}\marg{code}\marg{hook type} instead.
+%
+%Here's an example for a language with different writing systems.
+%The resource file for Serbian \texttt{mypackage-serbian.ldf}:
+%\begin{verbatim}
+%\TrackLangProvidesResource{serbian}[2016/10/06 v1.0]% identify file
+%
+%\TrackLangRequestResource{serbian-\CurrentTrackedScript}
+%{}% file not found, do something sensible here
+%\end{verbatim}
+%The file \texttt{mypackage-serbian-Latn.ldf} sets up
+%the Latin script:
+%\begin{verbatim}
+%\TrackLangProvidesResource{serbian-Latn}[2016/10/06 v1.0]
+%
+%\TrackLangAddToCaptions{%
+%  \def\fooname{...}% provide appropriate Latin translations
+%  \def\barname{...}%
+%}
+%\end{verbatim}
+%The file \texttt{mypackage-serbian-Cyrl.ldf} sets up
+%the Cyrllic script:
+%\begin{verbatim}
+%\TrackLangProvidesResource{serbian-Cyrl}[2016/10/06 v1.0]
+%
+%\TrackLangAddToCaptions{%
+%  \def\fooname{...}% provide appropriate Cyrllic translations
+%  \def\barname{...}%
+%}
+%\end{verbatim}
+%
+%\section{Language Packages}
+%\label{sec:summary-langpkg}
+%
+%Let's suppose now you're the developer of a package that 
+%sets up the language, hyphenation patterns and so on.
+%It would be really helpful to the locale-sensitive packages 
+%in \sectionref{sec:summary-localepkg} to know what languages
+%the document author has requested. You can use the
+%\styfmt{tracklang} package to identify this information
+%by tracking the requested localisation, so that other packages
+%can have a consistent way of querying it.
+%
+%Generic use:
+%\begin{verbatim}
+%\input tracklang
+%\end{verbatim}
+%Alternative \LaTeX\ use:
+%\begin{verbatim}
+%\RequirePackage{tracklang}[2016/10/07] % v1.3
+%\end{verbatim}
+%Unlike \cs{input}, \cs{RequirePackage} will allow \styfmt{tracklang}
+%to pick up the document class options, but using \cs{RequirePackage}
+%will also trigger the tests for known language packages.
+%(If you want to find out if \styfmt{tracklang} has already been
+%loaded and locales have already been tracked, you can use the
+%same code as in the previous section.)
+%
+%When a user requests a particular language through your package,
+%the simplest way of letting \styfmt{tracklang} know about it
+%is to use \cs{TrackPredefinedDialect} or \cs{TrackLanguageTag}.
+%For example, if the user requests \texttt{british}, that's a
+%predefined dialect so you can just do:
+%\begin{verbatim}
+%\TrackPredefinedDialect{british}
+%\end{verbatim}
+%Alternatively
+%\begin{verbatim}
+%\TrackLanguageTag{en-GB}
+%\end{verbatim}
+%If your package uses caption hooks, then you can set up 
+%a mapping between \styfmt{tracklang}'s internal dialect label
+%and your caption label. For example, let's suppose the
+%closest match to English used in Malta (\texttt{en-MT}) is the 
+%dialect \texttt{UKenglish} (for example, the date format is 
+%similar between GB and MT):
+%\begin{verbatim}
+%\TrackLanguageTag{en-MT}
+%\SetTrackedDialectLabelMap{\TrackLangLastTrackedDialect}{UKenglish}
+%\def\captionsUKenglish{%
+%  \def\contentsname{Contents}%
+%  %...
+%}
+%\end{verbatim}
+%(The predefined \pkgopt{maltaenglish} option provided by
+%\styfmt{tracklang} automatically sets the mapping to
+%\texttt{british}, but the above method will change that mapping
+%to \texttt{UKenglish}.)
+%
+%This now means that \cs{TrackLangAddToCaptions} command used
+%at the end of \sectionref{sec:summary-localepkg} above can
+%find your caption hook. You don't need the map if your dialect
+%label is the same as \styfmt{tracklang}'s root language label
+%for that locale. For example:
+%\begin{verbatim}
+%\TrackLanguageTag{en-MT}
+%\def\captionsenglish{%
+%  \def\contentsname{Contents}%
+%  %...
+%}
+%\end{verbatim}
+%
+%When the user switches language through commands like
+%\ics{selectlanguage} it would be useful to also use
+%\ics{SetCurrentTrackedDialect}\marg{dialect} to make it easier
+%for the document author or locale-sensitive packages to pick
+%up the current locale. The \meta{dialect} argument may be
+%\styfmt{tracklang}'s internal dialect label or the dialect
+%label you assigned with \cs{SetTrackedDialectLabelMap}. It
+%may also be the root language label, in which case
+%\styfmt{tracklang} will search for the last dialect to be
+%tracked with that language. For example:
+%\begin{verbatim}
+%\def\selectlanguage#1{%
+%  % set up hyphenation patterns etc
+%  \SetCurrentTrackedDialect{#1}%
+%}
+%\end{verbatim}
+%See the example in \sectionref{sec:summary-doc}.
+%
+%\chapter{Generic Use}
+%\label{sec:generic}
+%
+%For plain \TeX\ you can input \texttt{tracklang.tex}:
+%\begin{verbatim}
+%\input tracklang
+%\end{verbatim}
+%or for \TeX\ formats that have an argument form for \ics{input}:
+%\begin{verbatim}
+%\input{tracklang}
+%\end{verbatim}
+%As from version 1.3, you don't need to change the category
+%code of \texttt{@} before loading \texttt{tracklang.tex}
+%as it will automatically be changed to 11 and switched
+%back at the end (if required).
+%
+%The \LaTeX\ package \texttt{tracklang.sty} 
+%inputs the generic \TeX\ code in \texttt{tracklang.tex}, but before 
+%it does so it defines
+%\begin{definition}
+%\cs{@tracklang@declareoption}\marg{name}
+%\end{definition}
+%to
+%\begin{definition}
+%\cs{DeclareOption}\marg{name}\{\cs{TrackPredefinedDialect}\marg{name}\}
+%\end{definition}
+%
+%This means that all the predefined languages and dialects
+%(\refoptstables) automatically become package options, so
+%the \styfmt{tracklang} package can pick up document class
+%options and add them to \styfmt{tracklang}'s internal list of tracked
+%document languages.
+%
+%If you're not using \LaTeX, this option isn't available
+%(although you could redefine the internal command 
+%\cs{@tracklang@declareoption}
+%to use something analogous to \cs{DeclareOption}).
+%Instead, the document languages need
+%to be explicitly identified (using any of the following commands)
+%so that \styfmt{tracklang} knows about them.
+%
+%\begin{definition}[\DescribeMacro\TrackPredefinedDialect]
+%\ics{TrackPredefinedDialect}\marg{dialect label}
+%\end{definition}
+%This will add the predefined dialect and its associated ISO codes to the list
+%of tracked document languages. The \meta{dialect label} may be any
+%of those listed in \refoptstables.
+%(See also \sectionref{sec:predefinedlang} and \sectionref{sec:predefined}.)
+%
+%For example:
+%\begin{verbatim}
+%\input tracklang
+%\TrackPredefinedDialect{british}
+%\end{verbatim}
+%is the Plain \TeX\ alternative to
+%\begin{verbatim}
+%\documentclass[british]{article}
+%\usepackage{tracklang}
+%\end{verbatim}
+%
+%Note that it's impractical to define every possible language
+%and region combination as it would significantly slow the
+%time taken to load \styfmt{tracklang} so, after version~1.3,
+%I don't intend adding any new predefined dialects. As from version
+%1.3, if you want to track a dialect that's not predefined by
+%\styfmt{tracklang}, then you can use:
+%\begin{definition}[\DescribeMacro\TrackLocale]
+%\cs{TrackLocale}\marg{locale}
+%\end{definition}
+%If \meta{locale} is a recognised dialect, this is equivalent to
+%using \cs{TrackPredefinedDialect}, otherwise \meta{locale}
+%needs to be in one the following formats:
+%\begin{itemize}
+%\item \meta{ISO lang}
+%\item \meta{ISO lang}\texttt{@}\meta{modifier}
+%\item \meta{ISO lang}\texttt{-}\meta{ISO country}
+%\item \meta{ISO lang}\texttt{-}\meta{ISO country}\texttt{@}\meta{modifier}
+%\end{itemize}
+%where \meta{ISO lang} is the ISO~639-1 or 639-2 code identifying
+%the language (lower case), \meta{ISO country} is the 3166-1
+%ISO code identifying the territory (upper case) and 
+%\meta{modifier} is the modifier or variant. The hyphen may be
+%replaced by an underscore character. Code set information in the
+%form \texttt{.}\meta{codeset} may optionally appear before the
+%modifier. For example, \texttt{de-DE.utf8@new} (modifier is
+%\texttt{new}) or \texttt{en-GB.utf8} (modifier is missing).
+%The codeset will be ignored if present, but it won't interfere
+%with the parsing.
+%
+%For example:
+%\begin{verbatim}
+%\TrackLocale{de-NA@new}
+%\end{verbatim}
+%indicates German in Namibia using the new spelling.
+%
+%\begin{important}
+%If a language has different \qt{T} and \qt{B} ISO~639-2 codes, then
+%the \qt{T} form should be used. (So for the above example,
+%\texttt{deu} may be used instead of \texttt{de}, but \texttt{ger}
+%won't be recognised.)
+%\end{important}
+%
+%Alternatively, you can use
+%\begin{definition}[\DescribeMacro\TrackLanguageTag]
+%\cs{TrackLanguageTag}\marg{tag}
+%\end{definition}
+%where \meta{tag} is a regular, well-formed language tag or a recognised dialect
+%label. (Irregular grandfather tags aren't recognised.)
+%This command will fully expand \meta{tag}.
+%A warning is issued if the tag is empty.
+%For example:
+%\begin{verbatim}
+%\TrackLanguageTag{hy-Latn-IT-arevela}
+%\end{verbatim}
+%
+%If \meta{tag} contains a sub-language tag, this will be set
+%as the 639-3 code for the \emph{dialect} label. Note that this is
+%different to the root language codes which are set using the
+%language label. For example
+%\begin{verbatim}
+%\TrackLanguageTag{zh-cmn-Hans-CN}
+%\end{verbatim}
+%creates a new dialect with the label \texttt{zhcmnHansCN}.
+%The root language \texttt{chinese} has the ISO 639-1 code
+%\texttt{zh} and the dialect \texttt{zhcmnHansCN} has the
+%ISO 639-3 code \texttt{cmn}.
+%\begin{verbatim}
+%ISO 639-1: \TrackedIsoCodeFromLanguage{639-1}{chinese}.
+%ISO 639-3: \TrackedIsoCodeFromLanguage{639-3}{zhcmnHansCN}.
+%\end{verbatim}
+%
+%Version 1.2 (currently pending) of
+%\sty{texosquery} will have a new command \ics{TeXOSQueryLangTag},
+%which may be used to fetch the operating system's regional
+%information as a language tag. These commands can be used as
+%follows:
+%\begin{verbatim}
+%\input tracklang % v1.3
+%\input texosquery % v1.2
+%
+%\TeXOSQueryLangTag{\langtag}
+%\TrackLanguageTag{\langtag}
+%\end{verbatim}
+%(If the shell escape is disabled, \cs{langtag} will be empty, which
+%will trigger a~warning but no errors.)
+%
+%Some of the predefined root language options listed
+%in \tableref{tab:rootlangopts} have an associated region
+%(denoted by \fnregion).
+%If \cs{TrackLocale} is used with just the language ISO code,
+%no region is tracked for that language. For example
+%\begin{verbatim}
+%\TrackLocale{manx}
+%\end{verbatim}
+%will track the \qt{IM} ISO~3166-1 code but
+%\begin{verbatim}
+%\TrackLocale{gv}
+%\end{verbatim}
+%won't track the region.
+%Similarly for \cs{TrackLanguageTag}.
+%
+%(New to version 1.3.)
+%There's a similar command to \cs{TrackLocale} that doesn't take an argument:
+%\begin{definition}[\DescribeMacro\TrackLangFromEnv]
+%\cs{TrackLangFromEnv}
+%\end{definition}
+%If the shell escape has been enabled or
+%\ics{directlua} is available, this will try to get the language
+%information from the system environment variables 
+%\envvar{LC\_ALL} or \envvar{LANG}
+%and, if successful, track that.
+%
+%Since \styfmt{tracklang} is neither able to look up the POSIX locale
+%tables nor interpret file locales, if the result is \texttt{C} or
+%\texttt{POSIX} or starts with a forward slash \texttt{/} then
+%the locale value is treated as empty.
+%
+%\begin{important}
+%Not all operating systems use environment variables for
+%the system locale information. For example, Windows stores the
+%locale information in the registry. In which case, consider
+%using \styfmt{texosquery}.
+%\end{important}
+%
+%If the operating system locale can't be obtained from environment variables, then
+%\styfmt{tracklang} will use \ics{TeXOSQueryLocale} as a fallback if
+%\styfmt{texosquery} has been loaded. Since \sty{texosquery} requires
+%both the shell escape and the Java runtime environment,
+%\styfmt{tracklang} doesn't automatically load it.
+%
+%Plain \TeX\ example:
+%\begin{verbatim}
+%\input texosquery
+%\input tracklang
+%\TrackLangFromEnv
+%\end{verbatim}
+%with \texttt{etex -{}-shell-escape }\meta{filename}
+%
+%\LaTeX\ example:
+%\begin{verbatim}
+%\usepackage{texosquery}
+%\usepackage{tracklang}
+%\TrackLangFromEnv
+%\end{verbatim}
+%with \texttt{latex -{}-shell-escape }\meta{filename}
+%
+%If the locale can't be determined, there will be warning messages.
+%These can be suppressed using
+%\begin{definition}[\DescribeMacro\TrackLangShowWarningsfalse]
+%\cs{TrackLangShowWarningsfalse}
+%\end{definition}
+%or switched back on again using
+%\begin{definition}[\DescribeMacro\TrackLangShowWarningstrue]
+%\cs{TrackLangShowWarningstrue}
+%\end{definition}
+%
+%For example, I have the environment variable \envvar{LANG} set to 
+%\texttt{en\_GB.utf8} on my Linux system so instead of
+%\begin{verbatim}
+%\TrackPredefinedDialect{british}
+%\end{verbatim}
+%I can use
+%\begin{verbatim}
+%\TrackLangFromEnv
+%\end{verbatim}
+%
+%With \LaTeX\ documents I can do
+%\begin{verbatim}
+%\documentclass{article}
+%\usepackage{tracklang}
+%\TrackLangFromEnv
+%\end{verbatim}
+%However, this only helps subsequently loaded packages that
+%use \styfmt{tracklang} to determine the required regional 
+%settings. For example:
+%\begin{verbatim}
+%\documentclass{article}
+%\usepackage{tracklang}
+%\TrackLangFromEnv
+%\usepackage[useregional]{datetime2}
+%\end{verbatim}
+%In my case, with \envvar{LANG} set to \texttt{en\_GB.utf8} and
+%shell escape enabled, this automatically switches on the 
+%\texttt{en-GB} date style.
+%Naturally this doesn't help locale-sensitive packages that don't use
+%\styfmt{tracklang}.
+%
+%The \cs{TrackLangFromEnv} command also incidentally sets
+%\begin{definition}[\DescribeMacro\TrackLangEnv]
+%\cs{TrackLangEnv}
+%\end{definition}
+%to the value of the environment variable or empty if the
+%query was unsuccessful (for example, the shell escape is
+%unavailable).
+%
+%If \cs{TrackLangEnv} is already defined before 
+%\cs{TrackLangFromEnv} is used, then the environment variable
+%won't be queried and the value of \cs{TrackLangEnv} will be 
+%parsed instead.
+%
+%\begin{important}
+%The parser which splits the locale string into 
+%its component parts first tries splitting on the underscore
+%\texttt{\_} with its usual category code~8, then tries splitting 
+%on a hyphen \texttt{-} with category code~12, and then tries 
+%splitting on the underscore \texttt{\_} with category code~12.
+%\end{important}
+%
+%For example:
+%\begin{verbatim}
+%\def\TrackLangEnv{en-GB}
+%\TrackLangFromEnv
+%\end{verbatim}
+%This doesn't perform a shell escape since \cs{TrackLangEnv}
+%is already defined. In this case, you may just as well use
+%\begin{verbatim}
+%\TrackLocale{en-GB}
+%\end{verbatim}
+%(unless you happen to additionally require the component
+%commands that are set by \cs{TrackLangFromEnv}, see below.)
+%
+%If the shell escape is unavailable 
+%(for example, your \TeX\ installation prohibits it), you
+%can set this value when you invoke \TeX. For example,
+%if the document file is called \texttt{myDoc.tex} (and it's
+%in Plain \TeX):
+%\begin{verbatim}
+%tex "\\def\TrackLangEnv{$LANG}\\input myDoc"
+%\end{verbatim}
+%
+%The \cs{TrackLangFromEnv} command also happens to store the
+%component parts of the environment variable value in the
+%following commands. (These aren't provided by 
+%\cs{TrackLocale}.)
+%
+%The language code is stored in:
+%\begin{definition}[\DescribeMacro\TrackLangEnvLang]
+%\cs{TrackLangEnvLang}
+%\end{definition}
+%
+%The territory (if present) is stored in:
+%\begin{definition}[\DescribeMacro\TrackLangEnvTerritory]
+%\cs{TrackLangEnvTerritory}
+%\end{definition}
+%(Defined to empty if not present.)
+%
+%The codeset (if present) is stored in:
+%\begin{definition}[\DescribeMacro\TrackLangEnvCodeSet]
+%\cs{TrackLangEnvCodeSet}
+%\end{definition}
+%(Defined to empty if not present.)
+%
+%The modifier (if present) is stored in:
+%\begin{definition}[\DescribeMacro\TrackLangEnvModifier]
+%\cs{TrackLangEnvModifier}
+%\end{definition}
+%(Defined to empty if not present.)
+%
+%If you want to query the language environment, but don't
+%want to track the result, you can just use:
+%\begin{definition}[\DescribeMacro\TrackLangQueryEnv]
+%\cs{TrackLangQueryEnv}
+%\end{definition}
+%This only tries to fetch the value of the
+%language environment variable (and use \sty{texosquery} as
+%a fallback, if it has been loaded). It doesn't try to parse the 
+%result. The result is stored in \cs{TrackLangEnv} (empty if 
+%unsuccessful). Unlike \cs{TrackLangFromEnv}, this doesn't check if
+%\cs{TrackLangEnv} already exists. A warning will occur if the shell
+%escape is unavailable. For systems that store the locale information in
+%environment variables, this is more efficient than using
+%\sty{texosquery}'s \cs{TeXOSQueryLocale} command (which is what's
+%used as the fallback).
+%
+%The above queries \envvar{LC\_ALL} and, if that is unsuccessful,
+%then queries \envvar{LANG} (before optionally falling back on 
+%\sty{texosquery}). If you want another environment
+%variable tried after \envvar{LC\_ALL} and before \envvar{LANG},
+%you can instead use:
+%\begin{definition}[\DescribeMacro\TrackLangQueryOtherEnv]
+%\cs{TrackLangQueryOtherEnv}\marg{name}
+%\end{definition}
+%For example, to also query \envvar{LC\_MONETARY}:
+%\begin{verbatim}
+%\TrackLangQueryOtherEnv{LC_MONETARY}
+%\end{verbatim}
+%
+%Since this sets \cs{TrackLangEnv}, you can use it before
+%\cs{TrackLangFromEnv}. For example:
+%\begin{verbatim}
+%\TrackLangQueryOtherEnv{LC_MONETARY}
+%\TrackLangFromEnv
+%\end{verbatim}
+%Remember that if you only want to do the shell escape if
+%\cs{TrackLangEnv} hasn't already been defined, you can test for this
+%first:
+%\begin{verbatim}
+%\ifx\TrackLangEnv\undefined
+%  \TrackLangQueryOtherEnv{LC_MONETARY}
+%\fi
+%\TrackLangFromEnv
+%\end{verbatim}
+%
+%It's also possible to just parse the value of \cs{TrackLangEnv}
+%without tracking the result using:
+%\begin{definition}[\DescribeMacro\TrackLangParseFromEnv]
+%\cs{TrackLangParseFromEnv}
+%\end{definition}
+%This is like \cs{TrackLangFromEnv} but assumes that 
+%\cs{TrackLangEnv} has already been set and doesn't track the 
+%result. The component parts are stored as for \cs{TrackLangFromEnv}.
+%
+%Example (Plain \TeX):
+%\begin{verbatim}
+%\input tracklang
+%
+%\def\TrackLangEnv{fr-BE.utf8@euro}
+%
+%\TrackLangParseFromEnv
+%
+%Language: \TrackLangEnvLang.
+%Territory: \TrackLangEnvTerritory.
+%Codeset: \TrackLangEnvCodeSet.
+%Modifier: \TrackLangEnvModifier.
+%Any tracked languages? \AnyTrackedLanguages{Yes}{No}.
+%
+%\end{verbatim}
+%This produces:
+%
+%\medskip
+%
+%Language: fr. Territory: BE.  Codeset: utf8.  Modifier: euro.
+%Any tracked languages? No.
+%
+%\medskip
+%
+%Compare this with:
+%\begin{verbatim}
+%\input tracklang
+%
+%\def\TrackLangEnv{fr-BE.utf8@euro}
+%
+%\TrackLangFromEnv
+%
+%Language: \TrackLangEnvLang.
+%Territory: \TrackLangEnvTerritory.
+%Codeset: \TrackLangEnvCodeSet.
+%Modifier: \TrackLangEnvModifier.
+%Any tracked languages? \AnyTrackedLanguages{Yes}{No}.
+%Tracked dialect(s):%
+%\ForEachTrackedDialect{\thisdialect}{\space\thisdialect}.
+%\end{verbatim}
+%This produces:
+%
+%\medskip
+%
+%Language: fr. Territory: BE.  Codeset: utf8.  Modifier: euro.
+%Any tracked languages? Yes.
+%Tracked dialect(s): belgique.
+%
+%\medskip
+%
+%If \cs{TrackLangFromEnv} doesn't recognise the given language and
+%territory combination, it will define a new dialect and add that.
+%
+%For example, \styfmt{tracklang} doesn't recognise \texttt{en-BE}, so
+%the sample document below defines a new dialect labelled
+%\texttt{enBEeuro}:
+%\begin{verbatim}
+%\input tracklang
+%
+%\def\TrackLangEnv{en-BE.utf8@euro}
+%
+%\TrackLangFromEnv
+%
+%Language: \TrackLangEnvLang.
+%Territory: \TrackLangEnvTerritory.
+%Codeset: \TrackLangEnvCodeSet.
+%Modifier: \TrackLangEnvModifier.
+%Any tracked languages? \AnyTrackedLanguages{Yes}{No}.
+%Tracked dialect(s):%
+%\ForEachTrackedDialect{\thisdialect}{\space\thisdialect}.
+%\end{verbatim}
+%This now produces:
+%\medskip
+%
+%Language: en. Territory: BE.  Codeset: utf8.  Modifier: euro.
+%Any tracked languages? Yes.
+%Tracked dialect(s): enBEeuro.
+%
+%\chapter{Detecting the User's Requested Languages}
+%\label{sec:user}
+%
+%The \styfmt{tracklang} package tries to track the loaded languages and
+%the option names used to identify those languages. For want of a better
+%term, the language option names are referred to as dialects even if
+%they're only a synonym for the language rather than an actual
+%dialect.  For example, if the user
+%has requested \texttt{british}, the \emph{root language} label is
+%\texttt{english} and the dialect is \texttt{british}, whereas if the
+%user requested \texttt{UKenglish}, the root language label is
+%\texttt{english} and the dialect is \texttt{UKenglish}. The
+%exceptions to this are the \styfmt{tracklang} package options that have been
+%specified in the form \meta{iso lang}-\meta{iso country} (listed
+%in \tableref{tab:rootlangopts}). For
+%example, the package option \texttt{en-GB} behaves as though the
+%user requested the package option \texttt{british}.
+%
+%If \cs{TrackLocale} or \cs{TrackLangFromEnv} are used and the locale
+%isn't recognised a new dialect is created with the label formed from
+%the ISO codes (and modifier, if present). 
+%Similarly for \cs{TrackLanguageTag} a new
+%dialect is created with a label that's essentially the language tag
+%without the hyphen separators.  For example, 
+%\begin{verbatim}
+%\TrackLocale{xx-YY}
+%\end{verbatim}
+%will add a new dialect with the label \texttt{xxYY},
+%\begin{verbatim}
+%\TrackLocale{xx-YY@mod}
+%\end{verbatim}
+%will add a new dialect with the label \texttt{xxYYmod} and 
+%\begin{verbatim}
+%\TrackLanguageTag{xx-YY-Latn}
+%\end{verbatim}
+%will add a new dialect with the label \texttt{xxYYLatn}.
+%
+%\begin{important}
+%If \cs{TrackLocale} or \cs{TrackLangFromEnv} find a modifier, the 
+%value will be sanitized to allow it to be used as a label. If the
+%modifier is set explicitly using \cs{SetTrackedDialectModifier}, 
+%no sanitization is performed.
+%\end{important}
+%
+%In addition to the root language label and the dialect identifier,
+%many of the language options also have corresponding ISO codes. In
+%most cases there is an ISO~639-1 or an ISO~639-2 code (or both), and in some
+%cases there is an ISO~3166-1 code identifying the dialect region.
+%Where a language has both a \qt{T} and a \qt{B} ISO~639-2
+%code, the \qt{T} version is assumed.
+%
+%When the \styfmt{tracklang} \LaTeX\ package is loaded, it first attempts to find the
+%language options through the package options supplied to
+%\styfmt{tracklang}. This means that any languages that have been
+%supplied in the document class options should get identified
+%(provided that the document class has used the standard option
+%declaration mechanism).  If no languages have been supplied in this
+%way, \styfmt{tracklang} then attempts to identify any \sty{babel}
+%language options and failing that it will try the \sty{translator}
+%language options. It will then check if \sty{ngerman} or
+%\sty{polyglossia} have been loaded.
+%
+%Each identified language and dialect is added to the \emph{tracked
+%language} and \emph{tracked dialect} lists. Note that the tracked
+%language and tracked dialect are labels rather than proper nouns.
+%If a~dialect label is identical to its root language label, the
+%label will appear in both lists.
+%
+%You can check whether or not any languages have been detected using:
+%\begin{definition}[\DescribeMacro\AnyTrackedLanguages]
+%\cs{AnyTrackedLanguages}\marg{true part}\marg{false part}
+%\end{definition}
+%This will do \meta{true part} if one or more languages have been
+%detected otherwise it will do \meta{false part}. (Each detected
+%dialect will automatically have the root language label added
+%to the tracked language list, if it's not already present.)
+%
+%If you want to find out if any of the tracked dialects
+%matches a particular language tag, you can use:
+%\begin{definition}[\DescribeMacro\GetTrackedDialectFromLanguageTag]
+%\ics{GetTrackedDialectFromLanguageTag}\marg{tag}\marg{cs}
+%\end{definition}
+%If successful, the supplied control sequence \meta{cs} is set to the
+%dialect label, otherwise \meta{cs} is set to empty. The test is for an exact
+%match on the root language, script, sub-language, variant and
+%region. The control sequence \meta{cs} will be empty if none of the
+%tracked dialects matches all five of those elements. (If the script
+%isn't given explicitly, the default for that language is assumed.)
+%In the event that \meta{cs} is empty, you can now (as from v1.3.6)
+%get the closest match with
+%\begin{definition}[\DescribeMacro\TrackedDialectClosestSubMatch]
+%\ics{TrackedDialectClosestSubMatch}
+%\end{definition}
+%(which is set by \cs{GetTrackedDialectFromLanguageTag}).
+%This will be empty if no tracked dialects match on the root
+%language or if there's a tracked dialect label that exactly matches
+%the label formed by concatenating the language code, sub-language,
+%script, region, modifier and variant.
+%
+%For example (Plain \TeX):
+%\begin{verbatim}
+%\input tracklang
+%\TrackLanguageTag{en-826}
+%Has en-GB-Latn been tracked?
+%\GetTrackedDialectFromLanguageTag{en-GB-Latn}{\thisdialect}%
+%\ifx\thisdialect\empty
+% No!
+%\else
+% Yes! Dialect label: \thisdialect.
+%\fi
+%\bye
+%\end{verbatim}
+%This matches because the territory code 826 is recognised as
+%equivalent to the code GB, and the default script for
+%\texttt{english} is \texttt{Latn}. In this case, the dialect
+%label is \texttt{british}. Note that this doesn't require
+%the use of \cs{TrackLanguageTag} to track the dialect. 
+%It also works if the dialect has been tracked using other commands,
+%such as \cs{TrackLocale}.
+%
+%Here's an example that doesn't have an exact match, but does have a
+%partial match:
+%\begin{verbatim}
+%\input tracklang
+%\TrackLanguageTag{de-CH-1996}
+%Has de-DE-1996 been tracked?
+%\GetTrackedDialectFromLanguageTag{de-DE-1996}{\thisdialect}%
+%\ifx\thisdialect\empty
+% No!
+%  \ifx\TrackedDialectClosestSubMatch\empty
+%    No match on root language.
+%  \else
+%    Closest match: \TrackedDialectClosestSubMatch.
+%  \fi
+%\else
+% Yes! Dialect label: \thisdialect.
+%\fi
+%\bye
+%\end{verbatim}
+%In this case the result is:
+%\begin{quote}
+%Has de-DE-1996 been tracked? No! Closest match: nswissgerman.
+%\end{quote}
+%
+%You can iterate through each tracked dialect using:
+%\begin{definition}[\DescribeMacro\ForEachTrackedDialect]
+%\cs{ForEachTrackedDialect}\marg{cs}\marg{code}
+%\end{definition}
+%At the start of each iteration, this sets the control sequence 
+%\meta{cs} to the tracked dialect and does \meta{code}.
+%
+%You can iterate through each tracked language using:
+%\begin{definition}[\DescribeMacro\ForEachTrackedLanguage]
+%\cs{ForEachTrackedLanguage}\marg{cs}\marg{code}
+%\end{definition}
+%At the start of each iteration, this sets the control sequence \meta{cs} to the 
+%tracked language and does \meta{code}.
+%
+%The above for-loops use the same internal mechanism as \LaTeX's
+%\cs{@for} loop. The provided control sequence \meta{cs} is updated at the
+%start of each iteration to the current element. The loop is
+%terminated when this control sequence is set to \cs{@nil}. This
+%special control sequence should never been used as it's just a
+%marker and isn't actually defined. If you get an error message
+%stating that \cs{@nil} is undefined, then it's most likely due to a
+%loop control sequence being used outside the loop. This can occur if
+%the loop contains code that isn't expanded until later. For example,
+%if the loop code includes \cs{AtBeginDocument}, you need to ensure
+%that the loop control sequence is expanded before being added to the
+%hook.
+%
+%You can test if a root language has been detected using:
+%\begin{definition}[\DescribeMacro\IfTrackedLanguage]
+%\cs{IfTrackedLanguage}\marg{label}\marg{true part}\marg{false part}
+%\end{definition}
+%where \meta{label} is the language label. If
+%true, this does \meta{true part} otherwise it does \meta{false
+%part}.
+%
+%You can test if a particular dialect has been detected using:
+%\begin{definition}[\DescribeMacro\IfTrackedDialect]
+%\cs{IfTrackedDialect}\marg{label}\marg{true part}\marg{false part}
+%\end{definition}
+%where \meta{label} is the dialect label. If the root language was explicitly specified, then it will
+%also be detected as a dialect.
+%
+%For example:
+%\begin{verbatim}
+%\documentclass[british,dutch]{article}
+%
+%\usepackage{tracklang}
+%
+%\begin{document}
+%``english'' \IfTrackedDialect{english}{has}{hasn't} been specified.
+%
+%``british'' \IfTrackedDialect{british}{has}{hasn't} been specified.
+%
+%``flemish'' \IfTrackedDialect{flemish}{has}{hasn't} been specified.
+%
+%``dutch'' \IfTrackedDialect{dutch}{has}{hasn't} been specified.
+%
+%``english'' or an English variant 
+%\IfTrackedLanguage{english}{has}{hasn't} been specified.
+%
+%\end{document}
+%\end{verbatim}
+%This produces:
+%\begin{quote}
+%``english'' hasn't been specified.
+%
+%``british'' has been specified.
+%
+%``flemish'' hasn't been specified.
+%
+%``dutch'' has been specified.
+%
+%``english'' or an English variant has been specified.
+%\end{quote}
+%
+%You can find the root language label for a given tracked dialect
+%using:
+%\begin{definition}[\DescribeMacro\TrackedLanguageFromDialect]
+%\cs{TrackedLanguageFromDialect}\marg{dialect}
+%\end{definition}
+%If \meta{dialect} hasn't been defined this does nothing otherwise it
+%expands to the root language label.
+%
+%You can find the tracked dialects from a given root language
+%using:
+%\begin{definition}[\DescribeMacro\TrackedDialectsFromLanguage]
+%\cs{TrackedDialectsFromLanguage}\marg{root language label}
+%\end{definition}
+%This will expand to a~comma-separated list of dialect labels
+%if the root language label has been defined, otherwise it
+%does nothing.
+%
+%
+%You can test if a language or dialect has a corresponding ISO code using:
+%\begin{definition}[\DescribeMacro\IfTrackedLanguageHasIsoCode]
+%\cs{IfTrackedLanguageHasIsoCode}\marg{code
+%type}\marg{label}\marg{true part}\marg{false part}
+%\end{definition}
+%where \meta{code type} is the type of ISO code (for example,
+%\texttt{639-1} for root languages or \texttt{3166-1} for regional
+%dialects), and \meta{label} is the language or dialect label.
+%Note that the \texttt{639-3} may be set for the dialect
+%rather than root language for sub-languages parsed using
+%\ics{TrackLanguageTag}.
+%
+%Alternatively, you can test if a particular ISO code has been
+%defined using:
+%\begin{definition}[\DescribeMacro\IfTrackedIsoCode]
+%\cs{IfTrackedIsoCode}\marg{code type}\marg{code}\marg{true
+%part}\marg{false part}
+%\end{definition}
+%where \meta{code type} is again the type of ISO code (for example,
+%\texttt{639-1} or \texttt{3166-1}), and \meta{code} is the
+%particular code (for example, \texttt{en} for ISO 639-1 or
+%\texttt{GB} for ISO 3166-1).
+%
+%You can fetch the language (or dialect) label associated with a
+%given ISO code using:
+%\begin{definition}[\DescribeMacro\TrackedLanguageFromIsoCode]
+%\cs{TrackedLanguageFromIsoCode}\marg{code type}\marg{code}
+%\end{definition}
+%This does nothing if the given \meta{code} for the given ISO
+%\meta{code type} has not been defined, otherwise it expands
+%a~comma-separated list of language or dialect labels.
+%
+%You can fetch the ISO code for a given code type using:
+%\begin{definition}[\DescribeMacro\TrackedIsoCodeFromLanguage]
+%\cs{TrackedIsoCodeFromLanguage}\marg{code type}\marg{label}
+%\end{definition}
+%where \meta{label} is the language or dialect label and \meta{code
+%type} is the ISO code type (for example, \texttt{639-1} or
+%\texttt{3166-1}). Unlike \ics{TrackedLanguageFromIsoCode}, this
+%command only expands to a single label rather than a~comma-separated
+%list.
+%
+%The above commands do nothing in the event of an unknown code or
+%code type,
+%so if you accidentally get the wrong code type, you won't get an error.
+%If you're unsure of the code type, you can use the following commands:
+%\begin{definition}[\DescribeMacro\TwoLetterIsoCountryCode]
+%\cs{TwoLetterIsoCountryCode}
+%\end{definition}
+%This expands to 3166-1 and is used for the two-letter country codes.
+%
+%\begin{definition}[\DescribeMacro\TwoLetterIsoLanguageCode]
+%\cs{TwoLetterIsoLanguageCode}
+%\end{definition}
+%This expands to 639-1 and is used for the two-letter root language codes.
+%
+%\begin{definition}[\DescribeMacro\ThreeLetterIsoLanguageCode]
+%\cs{ThreeLetterIsoLanguageCode}
+%\end{definition}
+%This expands to 639-2 and is used for the three-letter root language
+%codes.
+%
+%\begin{definition}[\DescribeMacro\ThreeLetterExtIsoLanguageCode]
+%\cs{ThreeLetterExtIsoLanguageCode}
+%\end{definition}
+%(New to v1.3.) This expands to 639-3. This code is only used for a root language if 
+%there's no 639-1 or 639-2 code. It may also be used for a
+%dialect if a sub-language part has been set in the language
+%tag parsed by \cs{TrackLanguageTag}.
+%
+%The \cs{Get\ldots} commands below are designed to be expandable.
+%If the supplied \meta{dialect} is unrecognised they expand to empty.
+%Remember that the dialect must first be identified as a tracked 
+%language for it to be recognised.
+%
+%As from v1.3, the language tag for a given dialect can be obtained
+%using:
+%\begin{definition}[\DescribeMacro\GetTrackedLanguageTag]
+%\cs{GetTrackedLanguageTag}\marg{dialect}
+%\end{definition}
+%where \meta{dialect} is the label identifying the dialect.
+%Uses the \texttt{und} (undetermined) code for unknown languages.
+%
+%As from v1.3, each tracked dialect may also have an associated 
+%modifier, which can be fetched using:
+%\begin{definition}[\DescribeMacro\GetTrackedDialectModifier]
+%\cs{GetTrackedDialectModifier}\marg{dialect}
+%\end{definition}
+%where \meta{dialect} is the label identifying the dialect.
+%This value is typically obtained by parsing a POSIX locale identifier
+%with \cs{TrackLocale} or \cs{TrackLangFromEnv} but may be set explicitly.
+%(See \sectionref{sec:langsty} for setting this value. Likewise for
+%the following commands.)
+%
+%You can test if a dialect has an associated modifier using:
+%\begin{definition}[\DescribeMacro\IfHasTrackedDialectModifier]
+%\cs{IfHasTrackedDialectModifier}\marg{dialect}\marg{true}\marg{false}
+%\end{definition}
+%If the dialect has an associated modifier this does \meta{true}
+%otherwise it does \meta{false}.
+%
+%For example:
+%\begin{verbatim}
+%\documentclass[british,francais,american,canadian,canadien,dutch]{article}
+%
+%\usepackage{tracklang}
+%
+%\begin{document}
+%
+%Languages: \ForEachTrackedLanguage{\ThisLanguage}{\ThisLanguage\space
+%(ISO \TwoLetterIsoLanguageCode: 
+%``\TrackedIsoCodeFromLanguage{\TwoLetterIsoLanguageCode}{\ThisLanguage}''). }
+%
+%Dialects: \ForEachTrackedDialect{\ThisDialect}{\ThisDialect\space 
+%(\IfTrackedLanguageHasIsoCode{\TwoLetterIsoCountryCode}{\ThisDialect}%
+% {ISO \TwoLetterIsoCountryCode: 
+%  ``\TrackedIsoCodeFromLanguage{\TwoLetterIsoCountryCode}{\ThisDialect}''}%
+% {no specific region};
+%root: \TrackedLanguageFromDialect{\ThisDialect}). }
+%
+%Language for ISO \TwoLetterIsoCountryCode\ ``GB'':
+%\TrackedLanguageFromIsoCode{\TwoLetterIsoCountryCode}{GB}.
+%
+%Language for ISO \TwoLetterIsoCountryCode\ ``CA'': 
+%\TrackedLanguageFromIsoCode{\TwoLetterIsoCountryCode}{CA}.
+%
+%Country ISO \TwoLetterIsoCountryCode\ code for ``canadian'':
+%\TrackedIsoCodeFromLanguage{\TwoLetterIsoCountryCode}{canadian}.
+%
+%\end{document}
+%\end{verbatim}
+%This produces:
+%\begin{quote}
+%Languages: english (ISO 639-1: ``en''). french (ISO 639-1: ``fr'').
+%dutch (ISO 639-1: ``nl'').
+%
+%Dialects: american (ISO 3166-1: ``US''; root: english).
+%british (ISO 3166-1: ``GB''; root: english).
+%canadian (ISO 3166-1: ``CA''; root: english).
+%canadien (ISO 3166-1: ``CA''; root: french).
+%dutch (no specific region; root: dutch).
+%francais (no specific region; root: french).
+%
+%Language for ISO 3166-1 ``GB'': british.
+%
+%Language for ISO 3166-1 ``CA'': canadian,canadien.
+%
+%Country ISO 3166-1 code for ``canadian'': CA.
+%
+%\end{quote}
+%
+%As from v1.3, each tracked dialect may also have an associated 
+%variant, which can be fetched using:
+%\begin{definition}[\DescribeMacro\GetTrackedDialectVariant]
+%\cs{GetTrackedDialectVariant}\marg{dialect}
+%\end{definition}
+%where \meta{dialect} is the label identifying the dialect.
+%This value is typically obtained by parsing a language tag
+%with \cs{TrackLanguageTag} but may be set explicitly.
+%
+%You can test if a dialect has an associated variant using:
+%\begin{definition}[\DescribeMacro\IfHasTrackedDialectVariant]
+%\cs{IfHasTrackedDialectVariant}\marg{dialect}\marg{true}\marg{false}
+%\end{definition}
+%
+%As from v1.3, each tracked dialect may also have an associated 
+%script, which can be fetched using:
+%\begin{definition}[\DescribeMacro\GetTrackedDialectScript]
+%\cs{GetTrackedDialectScript}\marg{dialect}
+%\end{definition}
+%where \meta{dialect} is the label identifying the dialect.
+%
+%You can test if a dialect has an associated script using:
+%\begin{definition}[\DescribeMacro\IfHasTrackedDialectScript]
+%\cs{IfHasTrackedDialectScript}\marg{dialect}\marg{true}\marg{false}
+%\end{definition}
+%If the dialect has an associated script this does \meta{true}
+%otherwise it does \meta{false}. This information is provided
+%for language packages that need to know what script is required,
+%but there's no guarantee that the script will actually be set
+%in the document. Similarly for all the other attributes described
+%here.
+%
+%Note that the script should be a recognised four-letter ISO 15924
+%code, such as \texttt{Latn} or \texttt{Cyrl}. If a~dialect
+%doesn't have an associated script then the default for the root
+%language should be assumed. For example, \qt{Latn} for English dialects or
+%\qt{Cyrl} for Russian dialects. (The default script for
+%known languages can be obtained using
+%\cs{TrackLangGetDefaultScript}, see
+%\sectionref{sec:code:knownlangs} for further details.
+%Most root languages have a default script, but there
+%are a few without one as it may depend on region, politics
+%or ideology.)
+%
+%There's a convenient expandable command for testing the script:
+%\begin{definition}
+%\cs{IfTrackedDialectIsScriptCs}\marg{dialect}\marg{cs}\marg{true}\marg{false}
+%\end{definition}
+%This tests if the given tracked dialect has an associated script and
+%compares the value with the replacement text of \meta{cs}.
+%If the dialect hasn't been explicitly assigned a script,
+%then test is performed against the default script for the root
+%language.
+%
+%The supplementary package \sty{tracklang-scripts} provides some
+%additional commands relating to writing systems, including commands 
+%in the form \ics{TrackLangScript\meta{code}} where
+%\meta{code} is the ISO 15924 four-letter code. If the dialect
+%doesn't have an associated script, \meta{false} is done.
+%This package isn't
+%loaded automatically, so you'll need to explicitly load it. The
+%generic code is in \texttt{tracklang-scripts.tex}:
+%\begin{verbatim}
+%\input tracklang-scripts
+%\end{verbatim}
+%There's a convenient \LaTeX\ wrapper \texttt{tracklang-scripts.sty}:
+%\begin{verbatim}
+%\usepackage{tracklang-scripts}
+%\end{verbatim}
+%See \sectionref{sec:tracklang-scripts.tex} for further details of
+%that package.
+%
+%For example, the following defines a command to check if
+%the given dialect should use a Latin script:
+%\begin{verbatim}
+%\input tracklang-scripts
+%\def\islatin#1#2#3{%
+%  \IfTrackedDialectIsScriptCs{#1}{\TrackLangScriptLatn}{#2}{#3}%
+%}
+%\end{verbatim}
+%
+%\begin{important}
+%Note that the script value doesn't mean that the document is
+%actually using that script. It means that this is the user's
+%\emph{desired} script, but whether that script is actually set relies
+%on the appropriate settings in the relevant language package (such
+%as \sty{polyglossia}'s \texttt{script} key).
+%\end{important}
+%
+%As from v1.3, each tracked dialect may also have a sub-language
+%identifier (for example, \texttt{arevela}), which can be fetched
+%using:
+%\begin{definition}[\DescribeMacro\GetTrackedDialectSubLang]
+%\cs{GetTrackedDialectSubLang}\marg{dialect}
+%\end{definition}
+%where \meta{dialect} is the label identifying the dialect.
+%
+%You can test if a dialect has an associated sub-tag using:
+%\begin{definition}[\DescribeMacro\IfHasTrackedDialectSubLang]
+%\cs{IfHasTrackedDialectSubLang}\marg{dialect}\marg{true}\marg{false}
+%\end{definition}
+%If the dialect has an associated sub-tag this does \meta{true}
+%otherwise it does \meta{false}.
+%
+%As from v1.3, each tracked dialect may also have additional
+%information, which can be fetched using:
+%\begin{definition}[\DescribeMacro\GetTrackedDialectAdditional]
+%\cs{GetTrackedDialectAdditional}\marg{dialect}
+%\end{definition}
+%where \meta{dialect} is the label identifying the dialect.
+%
+%You can test if a dialect has additional information using:
+%\begin{definition}[\DescribeMacro\IfHasTrackedDialectAdditional]
+%\cs{IfHasTrackedDialectAdditional}\marg{dialect}\marg{true}\marg{false}
+%\end{definition}
+%If the dialect has additional information this does \meta{true}
+%otherwise it does \meta{false}.
+%
+%
+%Most packages that implement multilingual support have a~set of
+%language definition files for each supported language or dialect.
+%It may be that only the root language is needed, if there are no
+%variations between that language's dialect (for the purposes of that
+%package), or it may be that separate definition files are required
+%for each dialect. However it can be awkward trying to map the
+%requested dialect or language label to the file name. Should, say,
+%the file containing the French code be called
+%\meta{prefix}\texttt{-french-}\meta{suffix} or 
+%\meta{prefix}\texttt{-frenchb-}\meta{suffix} or 
+%\meta{prefix}\texttt{-francais-}\meta{suffix}?
+%Should, say, the file containing the British English code be called
+%\meta{prefix}\texttt{-british-}\meta{suffix} or 
+%\meta{prefix}\texttt{-UKenglish-}\meta{suffix}?
+%If you want to modularise the language support for your package so
+%that each language module has a different maintainer will the
+%maintainers know what tag to use for their language?
+%
+%To help with this, \styfmt{tracklang} provides:
+%\begin{definition}
+%\ics{IfTrackedLanguageFileExists}\marg{dialect}\marg{prefix}\marg{suffix}\marg{true part}\marg{false part}
+%\end{definition}
+%This attempts to find the file called
+%\meta{prefix}\meta{tag}\meta{suffix} where \meta{tag} is determined
+%from \meta{dialect}. If the file is found
+%\begin{definition}
+%\ics{CurrentTrackedTag}
+%\end{definition}
+%is set to \meta{tag} and \meta{true part} is done, otherwise
+%\meta{false part} is done.  If this command
+%is empty, then the dialect hasn't been detected. If the dialect
+%has been detected, but no file can be found, then
+%\ics{CurrentTrackedTag} is set to the final attempt at determining
+%\meta{tag}.
+%
+%There's a convenient shortcut command new to version 1.3:
+%\begin{definition}[\DescribeMacro\TrackLangRequireDialect]
+%\cs{TrackLangRequireDialect}\oarg{load code}\marg{pkgname}\marg{dialect}
+%\end{definition}
+%which uses \cs{IfTrackedLanguageFileExists} to input the resource
+%file if found. The prefix is given by \meta{pkgname}\texttt{-} and
+%the suffix is \texttt{.ldf}. A warning is issued if no resource file
+%is found. Note that while it makes sense for \meta{pkgname}
+%to be the same as the base name of the package that uses these
+%resource files, they don't have to be the same. This command
+%additionally defines
+%\begin{definition}[\DescribeMacro\TrackLangRequireDialectPrefix]
+%\cs{TrackLangRequireDialectPrefix}
+%\end{definition}
+%to \meta{pkgname}, which allows the prefix to be picked up by
+%resource file commands, such as \cs{TrackLangProvidesResource}
+%and \cs{TrackLangRequireResource}.  (See below.)
+%
+%The optional argument \meta{load code} is the code that actually
+%inputs the required file. This defaults to
+%\begin{verbatim}
+%\TrackLangRequireResource{\CurrentTrackedTag}
+%\end{verbatim}
+%
+%
+%The \ics{IfTrackedLanguageFileExists} command sets up the current
+%tracked dialect with
+%\ics{SetCurrentTrackedDialect}\marg{dialect}, which enables the following
+%commands that may be used within \meta{true part} or \meta{false
+%part}:
+%\begin{definition}
+%\ics{CurrentTrackedDialect}
+%\end{definition}
+%The dialect label.
+%
+%\begin{definition}
+%\ics{CurrentTrackedLanguage}
+%\end{definition}
+%If the dialect hasn't been detected, this command will be empty,
+%otherwise it will expand to the root language label (which may
+%be the same as the dialect label).
+%
+%\begin{definition}
+%\ics{CurrentTrackedRegion}
+%\end{definition}
+%If the dialect hasn't been detected, this command will be empty.
+%If the dialect has been assigned an ISO~3166-1 code,
+%\ics{CurrentTrackedRegion} will expand to that code, otherwise it
+%will be empty.
+%
+%\begin{definition}
+%\ics{CurrentTrackedIsoCode}
+%\end{definition}
+%If the dialect hasn't been detected, this command will be empty.
+%Otherwise it may be empty or it may expand to the
+%ISO~639-1 or ISO~639-2 or ISO~639-3 code.
+%
+%As from version 1.3, the following are also available, but
+%don't contribute to the tag.
+%\begin{definition}
+%\ics{CurrentTrackedDialectModifier}
+%\end{definition}
+%The dialect's modifier or empty if not set.
+%
+%\begin{definition}
+%\ics{CurrentTrackedDialectVariant}
+%\end{definition}
+%The dialect's variant or empty if not set.
+%
+%\begin{definition}
+%\ics{CurrentTrackedDialectSubTag}
+%\end{definition}
+%The dialect's sub-language code or empty if not set.
+%
+%\begin{definition}
+%\ics{CurrentTrackedDialectAdditional}
+%\end{definition}
+%The dialect's additional information or empty if not set.
+%
+%\begin{definition}
+%\ics{CurrentTrackedLanguageTag}
+%\end{definition}
+%The dialect's language tag. Take care not to confuse this
+%with \cs{CurrentTrackedTag}.
+%
+%\begin{definition}
+%\ics{CurrentTrackedDialectScript}
+%\end{definition}
+%The dialect's script. If the
+%dialect doesn't have the script set, the default script
+%is used instead. For example, the file \texttt{foo-serbian.ldf}
+%could test for the existence of the file
+%\begin{verbatim}
+%foo-serbian-\CurrentTrackedDialectScript.ldf
+%\end{verbatim}
+%and load it if it exists. The most convenient way is to
+%use \cs{TrackLangRequestResource} (described below):
+%\begin{verbatim}
+%\TrackLangRequestResource
+% {serbian-\CurrentTrackedDialectScript}
+% {}% not found, set default code here
+%\end{verbatim}
+%The Cyrillic settings could then be placed in 
+%\texttt{foo-serbian-Cyrl.ldf} and the Latin settings in
+%\texttt{foo-serbian-Latn.ldf}.
+%
+%The \meta{tag} is determined as follows:
+%\begin{enumerate}
+% \item If no dialect with the given label has been
+%  detected, the condition evaluates to \emph{false} and
+% \ics{CurrentTrackedTag} is empty.
+%
+% \item If there is no language code (ISO~639-1 or 639-2 or 639-3):
+%
+%  \begin{enumerate}
+%  \item If there's also no ISO~3166-1 code (\ics{CurrentTrackedRegion}
+%  is empty), then \meta{tag} (\ics{CurrentTrackedTag}) is set to the
+%  root language (\ics{CurrentTrackedLanguage}). If the file
+%  \meta{prefix}\meta{tag}\meta{suffix} exists, the condition will evaluate to
+%  \emph{true} otherwise it will evaluate to \emph{false}.
+%
+%  \item If there is an ISO~3166-1 code, then \meta{tag}
+% (\ics{CurrentTrackedTag}) will be set to \ics{CurrentTrackedRegion}
+% and if the file \meta{prefix}\meta{tag}\meta{suffix} exists,
+% the condition will evaluate to \emph{true} otherwise it will evaluate
+% to \emph{false}.
+%  \end{enumerate}
+%
+% \item If \ics{CurrentTrackedRegion} is empty (no ISO~3166-1
+% territory code)
+% then the \meta{tag} (\ics{CurrentTrackedTag}) is set to just
+% \ics{CurrentTrackedIsoCode}.
+%
+% If the file \meta{prefix}\meta{tag}\meta{suffix} exists, the condition will
+% evaluate to \emph{true}. If the file doesn't exist and
+% there are additional ISO language codes available (639-2 or 639-3)
+% then the test will be repeated for the next code. 
+% If the test still fails, then the condition evaluates to \emph{false}.
+%
+% \item\label{itm:lang-country} The \meta{tag} (\ics{CurrentTrackedTag}) is then set to
+%\begin{verbatim}
+%\CurrentTrackedIsoCode-\CurrentTrackedRegion
+%\end{verbatim}
+% and if the file \meta{prefix}\meta{tag}\meta{suffix} exists,
+% the condition evaluates to \emph{true}.
+%
+% \item The \meta{tag} (\ics{CurrentTrackedTag}) is then set to
+% just \ics{CurrentTrackedIsoCode}, and if the file 
+% \meta{prefix}\meta{tag}\meta{suffix} exists,
+% the condition evaluates to \emph{true}. If the file doesn't exist
+% and there are other ISO codes (639-2 or 639-3),
+% then \ics{CurrentTrackedIsoCode} is set to the next available
+% language code and step~\ref{itm:lang-country} is retried.
+%
+% \item If there is an ISO~3166-1 region code, the 
+% \meta{tag} (\ics{CurrentTrackedTag}) is then set to
+% \ics{CurrentTrackedRegion},
+% and if the file \meta{prefix}\meta{tag}\meta{suffix} exists,
+% the condition evaluates to \emph{true}.
+%
+% \item Finally, the \meta{tag} (\ics{CurrentTrackedTag}) is set to
+% the root language label and if the file
+% \meta{prefix}\meta{tag}\meta{suffix} exist the condition
+% evaluates to \emph{true} otherwise it evaluates to \emph{false}.
+%
+%\end{enumerate}
+%
+%For example (pre v1.3):
+%\begin{verbatim}
+%\AnyTrackedLanguages
+%{%
+%  \ForEachTrackedDialect{\ThisDialect}%
+%  {% try to load the language file for this dialect
+%    \IfTrackedLanguageFileExists{\ThisDialect}%
+%    {mypackage-}% file prefix
+%    {.ldf}% file suffix
+%    {\input mypackage-\CurrentTrackedTag.ldf}% file found
+%    {% file not found
+%      \PackageWarning{mypackage}{No support for language
+%       `\ThisDialect'}%
+%    }%
+%  }%
+%}
+%{% no languages detected so use defaults
+%}
+%\end{verbatim}
+%With version 1.3 onwards, this can be written more concisely as:
+%\begin{verbatim}
+%\AnyTrackedLanguages
+%{%
+%  \ForEachTrackedDialect{\ThisDialect}%
+%  {% try to load the language file for this dialect
+%    \TrackLangRequireDialect{mypackage}{\ThisDialect}%
+%  }%
+%}
+%{% no languages detected so use defaults
+%}
+%\end{verbatim}
+%which additionally enables the \styfmt{tracklang} version 1.3 commands described below,
+%such as \cs{TrackLangRequireResource}.
+%
+%If, for example, \ics{ThisDialect} is \texttt{british}, then the file search will
+%be in the order:
+%\begin{enumerate}
+%\item \texttt{mypackage-british.ldf}
+%\item \texttt{mypackage-en-GB.ldf}
+%\item \texttt{mypackage-eng-GB.ldf}
+%\item \texttt{mypackage-en.ldf}
+%\item \texttt{mypackage-eng.ldf}
+%\item \texttt{mypackage-GB.ldf}
+%\item \texttt{mypackage-english.ldf}
+%\end{enumerate}
+%
+%If, for example, \ics{ThisDialect} is \texttt{francais}, then the file search will
+%be in the order: 
+%\begin{enumerate}
+%\item \texttt{mypackage-francais.ldf}
+%\item \texttt{mypackage-fr.ldf}
+%\item \texttt{mypackage-fra.ldf}
+%\item \texttt{mypackage-french.ldf}
+%\end{enumerate}
+%This is because the predefined \texttt{francais} option has no
+%region assigned to it. Be careful if the dialect label is the actual
+%root language. For example, if \cs{ThisDialect} is \texttt{french},
+%then the file search will be in the order:
+%\begin{enumerate}
+%\item \texttt{mypackage-french.ldf}
+%\item \texttt{mypackage-fr.ldf}
+%\item \texttt{mypackage-fra.ldf}
+%\item \texttt{mypackage-french.ldf}
+%\end{enumerate}
+%Note that the last try will always fail in this case since if the
+%file exists, it will be found on the first try.
+%
+%If you're only providing support for the root languages (pre v1.3):
+%\begin{verbatim}
+%\AnyTrackedLanguages
+%{%
+%  \ForEachTrackedLanguage{\ThisLanguage}%
+%  {% try to load the language file for this root language
+%    \IfTrackedLanguageFileExists{\ThisLanguage}%
+%    {mypackage-}% file prefix
+%    {.ldf}% file suffix
+%    {\input mypackage-\CurrentTrackedTag.ldf}% file found
+%    {% file not found
+%      \PackageWarning{mypackage}{No support for language
+%       `\ThisLanguage'}%
+%    }%
+%  }%
+%}
+%{% no languages detected so use defaults
+%}
+%\end{verbatim}
+%With version 1.3 onwards, this can be written more concisely as:
+%\begin{verbatim}
+%\AnyTrackedLanguages
+%{%
+%  \ForEachTrackedLanguage{\ThisLanguage}%
+%  {% try to load the language file for this root language
+%    \TrackLangRequireDialect{mypackage}{\ThisLanguage}%
+%  }%
+%}
+%{% no languages detected so use defaults
+%}
+%\end{verbatim}
+%which additionally enables the commands described below.
+%Note that in this case, if more than one dialect for the same
+%language has been tracked, only the hooks for the last dialect for
+%that language will be adjusted, so it's usually best to iterate over
+%the dialects.
+%
+%The following \cs{TrackLang\ldots Resource\ldots} commands may 
+%only be used in resource files that are loaded using
+%\ics{TrackLangRequireDialect}. An error will occur if the file is
+%input through some other method.
+%
+%Within the resource file
+%\meta{pkgname}\texttt{-}\meta{tag}\texttt{.ldf}, 
+%you can identify the file using (new to version 1.3):
+%\begin{definition}[\DescribeMacro\TrackLangProvidesResource]
+%\cs{TrackLangProvidesResource}\marg{tag}\oarg{version info}
+%\end{definition}
+%
+%If \cs{ProvidesFile} is defined (through the \LaTeX\ kernel) this is
+%used, otherwise a simplified generic alternative is used that's 
+%suitable for other \TeX\ formats.
+%
+%The resource file can load another resource file 
+%\meta{pkgname}\texttt{-}\meta{tag2}\texttt{.ldf}, 
+%using (new to version 1.3):
+%\begin{definition}[\DescribeMacro\TrackLangRequireResource]
+%\cs{TrackLangRequireResource}\marg{tag2}
+%\end{definition}
+%For example, the dialect file \texttt{foo-en-GB.ldf} might need to
+%load the root language resource file \texttt{foo-english.ldf}:
+%\begin{verbatim}
+%\TrackLangProvidesResource{en-GB}
+%\TrackLangRequireResource{english}
+%\end{verbatim}
+%If \texttt{foo-english.ldf} is also identified with
+%\cs{TrackLangProvidesResource}, this will ensure that it's only
+%loaded once.
+%
+%If you require the resource file and want to perform
+%\meta{code1} if it's loaded at this point or \meta{code2} if it's
+%already been loaded then you can use (new to version 1.3):
+%\begin{definition}[\DescribeMacro\TrackLangRequireResourceOrDo]
+%\cs{TrackLangRequireResourceOrDo}\marg{tag2}\marg{code1}\marg{code2}
+%\end{definition}
+%
+%If you want to load a resource file if it exists (without an
+%error if it doesn't exist), then you can use
+%\begin{definition}[\DescribeMacro\TrackLangRequestResource]
+%\cs{TrackLangRequestResource}\marg{tag2}\marg{not found code}
+%\end{definition}
+%If the file doesn't exist, \meta{not found code} is done.
+%
+%\begin{important}
+%Note that these \cs{\ldots}\texttt{Resource} commands are only
+%permitted within the resource files. They are internally enabled
+%through \cs{TrackLangRequireDialect}.
+%\end{important}
+%
+%The above restriction on the resource files loaded through
+%\cs{TrackLangRequireDialect}, and the fact that it internally uses
+%\cs{IfTrackedLanguageFileExists}, means that commands like
+%\cs{CurrentTrackedLanguage} or \cs{CurrentTrackedDialect} may be
+%used in those files. This means that the name of the captions hook
+%can be obtained through them. (Remember that the file
+%\texttt{foo-en-GB.ldf} might have been loaded with, say, the
+%\texttt{british} dialect or with the synonymous \texttt{UKenglish}
+%dialect or with a dialect label that doesn't have a corresponding
+%caption hook, such as \texttt{enGBLatn}.)
+%
+%The \sty{polyglossia} package has caption hooks in the form 
+%\cs{captions\meta{language}} whereas \sty{babel} has captions hooks
+%in the form \cs{captions\meta{dialect}}. This leads to a rather
+%cumbersome set of conditionals:
+%\begin{verbatim}
+%\ifcsundef{captions\CurrentTrackedLanguage}
+%{%
+%  \ifcsundef{captions\CurrentTrackedDialect}%
+%  {}%
+%  {%
+%    \csgappto{captions\CurrentTrackedDialect}{%
+%      % code to append to hook
+%    }%
+%  }%
+%}%
+%{%
+%  \csgappto{captions\CurrentTrackedLanguage}{%
+%    % code to append to hook
+%  }%
+%}
+%% do code now to initialise
+%\end{verbatim}
+%Note that the above has been simplified through the use of
+%\sty{etoolbox} commands, which isn't suitable for generic use.
+%It also doesn't query the mapping from \styfmt{tracklang}'s dialect
+%label to the closest matching \sty{babel} dialect label.
+%
+%Instead (new to version 1.3), \styfmt{tracklang} provides a command
+%to perform this set of conditionals using generic code:
+%\begin{definition}[\DescribeMacro\TrackLangAddToHook]
+%\cs{TrackLangAddToHook}\marg{code}\marg{type}
+%\end{definition}
+%where \meta{code} is the code to append to the \meta{type} hook.
+%This always performs \meta{code} after testing for the hook in case
+%the hook is undefined or has already been called (for example, \sty{ngerman} uses
+%\cs{captionsngerman} when the package is loaded, not at the start of
+%the document).
+%
+%Note that this command is enabled through
+%\cs{TrackLangRequireDialect} so should only be used inside resource
+%files.
+%
+%Since \texttt{captions} is a commonly used hook type, there's 
+%a~shortcut command provided:
+%\begin{definition}[\DescribeMacro\TrackLangAddToCaptions]
+%\cs{TrackLangAddToCaptions}\marg{code}
+%\end{definition}
+%This is equivalent to
+%\cs{TrackLangAddToHook}\marg{code}\verb|{captions}|.
+%
+%
+%\section{Examples}
+%\label{sec:examples}
+%
+%The examples in this section illustrate the above commands.
+%
+%\subsection{animals.sty}
+%\label{sec:animals}
+%
+%This example is for a trivial package called \sty{animals.sty}
+%that defines three textual commands: \cs{catname}, \cs{dogname}
+%and \cs{ladybirdname}. The default values are: \qt{cat}, \qt{dog} and
+%\qt{bishy-barney-bee}.\footnote{Thass Broad Norfolk, my bewties
+%\texttt{:-P}}
+%
+%The supported languages are defined in files
+%with the prefix \texttt{animals-} and the suffix \texttt{.ldf}.
+%
+%Here's the code for \texttt{animals.sty}:
+%\begin{verbatim}
+% \NeedsTeXFormat{LaTeX2e}
+% \ProvidesPackage{animals}
+%
+% \RequirePackage{tracklang}[2016/10/07] %v1.3
+%
+% % Any undeclared options are language settings:
+% \DeclareOption*{\TrackLanguageTag{\CurrentOption}}
+% \ProcessOptions
+%
+% % Default definitions
+% \newcommand\catname{cat}
+% \newcommand\dogname{dog}
+% \newcommand\ladybirdname{bishy-barney-bee}
+%
+% \AnyTrackedLanguages
+% {%
+%   \ForEachTrackedDialect{\this@dialect}{%
+%     \TrackLangRequireDialect{animals}{\this@dialect}%
+%   }%
+% }
+% {% no tracked languages, default already set up
+% }
+%
+% \endinput
+%\end{verbatim}
+%Here's a Plain \TeX\ version that picks up the language from the
+%locale environment variable:
+%\begin{verbatim}
+% \input tracklang
+%
+% \TrackLangFromEnv
+%
+% % Default definitions
+% \def\catname{cat}
+% \def\dogname{dog}
+% \def\ladybirdname{bishy-barney-bee}
+%
+% \AnyTrackedLanguages
+% {%
+%   \ForEachTrackedDialect{\thisdialect}{%
+%     \TrackLangRequireDialect{animals}{\thisdialect}%
+%   }%
+% }
+% {% no tracked languages, default already set up
+% }
+%\end{verbatim}
+%In the event that a user or supplementary package for some 
+%reason wants to load a resource
+%file for a language that hasn't been tracked, it might be worth
+%providing a command for this purpose:
+%\begin{verbatim}
+%\newcommand*{\RequireAnimalsDialect}[1]{%
+%  \TrackLangRequireDialect{animals}{#1}%
+%}
+%\end{verbatim}
+%The loop can then be changed to:
+%\begin{verbatim}
+%  \ForEachTrackedDialect{\this@dialect}{%
+%    \RequireAnimalsDialect\this@dialect
+%  }%
+%\end{verbatim}
+%
+%The \texttt{animals-english.ldf} file valid for both the Plain \TeX\
+%and \LaTeX\ formats contains:
+%\begin{verbatim}
+%\TrackLangProvidesResource{english}
+%
+%\def\englishanimals{%
+%  \def\catname{cat}%
+%  \def\dogname{dog}%
+%  \def\ladybirdname{bishy-barney-bee}%
+%}
+%
+%\TrackLangAddToCaptions{\englishanimals}
+%\end{verbatim}
+%The \texttt{animals-en-GB.ldf} file contains:
+%\begin{verbatim}
+%\TrackLangProvidesResource{en-GB}
+%\TrackLangRequireResource{english}
+%
+%\def\enGBanimals{%
+%  \englishanimals
+%  \def\ladybirdname{ladybird}%
+%}
+%\TrackLangAddToCaptions{\enGBanimals}
+%\end{verbatim}
+%The \texttt{animals-en-US.ldf} file contains:
+%\begin{verbatim}
+%\TrackLangProvidesResource{en-US}
+%\TrackLangRequireResource{english}
+%
+%\def\enUSanimals{%
+%  \englishanimals
+%  \def\ladybirdname{ladybug}%
+%}
+%\TrackLangAddToCaptions{\enUSanimals}
+%\end{verbatim}
+%Here's a German version in the file \texttt{animals-german.ldf}:
+%\begin{verbatim}
+%\TrackLangProvidesResource{german}
+%
+%\def\germananimals{%
+%  \def\catname{Katze}%
+%  \def\dogname{Hund}%
+%  \def\ladybirdname{Marienk\"afer}%
+%}
+%
+%\TrackLangAddToCaptions{\germananimals}
+%\end{verbatim}
+%
+%This means that if \sty{babel} or \sty{polyglossia} are loaded, the
+%redefinitions are automatically performed whenever the language is
+%changed, but if there's no caption mechanism the user can switch
+%the fixed names using the \cs{\ldots animals} commands.
+%
+%Here's an example \LaTeX\ document that doesn't have any caption
+%hooks:
+%\begin{verbatim}
+%\documentclass[english,german,a4paper]{article}
+%
+%\usepackage{animals}
+%
+%\begin{document}
+%\englishanimals
+%
+%\catname.
+%\dogname.
+%\ladybirdname.
+%
+%\germananimals
+%
+%\catname.
+%\dogname.
+%\ladybirdname.
+%\end{document}
+%\end{verbatim}
+%Here's a \sty{babel} example document:
+%\begin{verbatim}
+%\documentclass[american,german,british,a4paper]{article}
+%
+%\usepackage{babel}
+%\usepackage{animals}
+%
+%\begin{document}
+%\selectlanguage{american}
+%
+%\catname.
+%\dogname.
+%\ladybirdname.
+%
+%\selectlanguage{german}
+%
+%\catname.
+%\dogname.
+%\ladybirdname.
+%
+%\selectlanguage{british}
+%
+%\catname.
+%\dogname.
+%\ladybirdname.
+%
+%\end{document}
+%\end{verbatim}
+%
+%There is some redundancy with the above resource files. Consider the
+%\sty{babel} example above. The \texttt{american} dialect is the
+%first option, so in that case \texttt{animals-en-US.ldf} is loaded
+%followed by \texttt{animals-english.ldf}. This means that the
+%\cs{captionsamerican} hook now includes
+%\begin{verbatim}
+%\englishanimals
+%\enUSanimals
+%\end{verbatim}
+%Since \cs{enUSanimals} includes \cs{englishanimals}, there is
+%redundant code. However, when the \texttt{british} dialect is
+%processed, this loads the file \texttt{animals-en-GB.ldf} but not
+%the file \texttt{animals-english.ldf} (since it's already been loaded). This
+%means that \cs{captionsbritish} contains \cs{enGBanimals} but not 
+%\cs{englishanimals}.
+%
+%If this redundancy is an issue (for example, there are so many
+%redefinitions needed that it significantly slows the document build
+%process), then it can be addressed with the following modifications.
+%The \texttt{animals-en-GB.ldf} file is now:
+%\begin{verbatim}
+%\TrackLangProvidesResource{en-GB}
+%
+%\def\enGBanimals{%
+%  \englishanimals
+%  \def\ladybirdname{ladybird}%
+%}
+%
+%\TrackLangRequireResourceOrDo{english}%
+%{
+%  \TrackLangAddToCaptions{%
+%    \def\ladybirdname{ladybird}%
+%  }%
+%}
+%{
+%  \TrackLangAddToCaptions{\enGBanimals}
+%}
+%\end{verbatim}
+%The \texttt{animals-en-US.ldf} file is now:
+%\begin{verbatim}
+%\TrackLangProvidesResource{en-US}
+%
+%\providecommand*{\enUSanimals}{%
+%  \englishanimals
+%  \renewcommand*{\ladybirdname}{ladybug}%
+%}
+%
+%\TrackLangRequireResourceOrDo{english}
+%{
+%  \TrackLangAddToCaptions{%
+%    \renewcommand*{\ladybirdname}{ladybird}%
+%  }%
+%}
+%{
+%  \TrackLangAddToCaptions{\enUSanimals}{captions}
+%}
+%\end{verbatim}
+%This means that the document that has the dialects listed in the
+%order \texttt{american}, \texttt{british} now has
+%\begin{verbatim}
+%\englishanimals
+%\def\ladybirdname{ladybird}
+%\end{verbatim}
+%in the \cs{captionsbritish} hook and just \cs{enUSanimals} in the
+%\cs{captionsamerican} hook, which has removed most of the redundancy.
+%
+%Note that \sty{polyglossia} has a \cs{captionsenglish} hook but not
+%\cs{captionsamerican} or \cs{captionsbritish}, so this code doesn't
+%allow for switching between variants of the same language with
+%\sty{polyglossia}.
+%
+%\subsection{regions.sty}
+%\label{sec:regions}
+%
+%Earlier, I~mentioned the search order for
+%\ics{IfTrackedLanguageFileExists} where if, for example, the dialect
+%is \texttt{british}, the file search will be:
+%\begin{enumerate}
+%\item \texttt{mypackage-british.ldf}
+%\item \texttt{mypackage-en-GB.ldf}
+%\item \texttt{mypackage-eng-GB.ldf}
+%\item \texttt{mypackage-en.ldf}
+%\item \texttt{mypackage-eng.ldf}
+%\item \texttt{mypackage-GB.ldf}
+%\item \texttt{mypackage-english.ldf}
+%\end{enumerate}
+%You may have wondered why
+%\texttt{mypackage-GB.ldf} is included in the search given that some
+%countries have multiple official languages, which means that the country code on its
+%own may not indicate the language.
+%
+%The reason for including just the country code as the \meta{tag} in the 
+%file search is to allow for region rather than language dependent
+%settings. For example, suppose I~want to write a package that needs
+%to know whether to use imperial or metric measurements in the
+%document, but I also want to provide multilingual support. The
+%language alone won't tell me whether to use imperial or metric (for
+%example, the US uses imperial and the UK uses metric for most
+%product attributes). I could provide \texttt{.ldf} files for every
+%language and region combination, but this would result in a lot
+%redundancy.
+%
+%\cs{TrackLangRequireDialect} has an optional argument for adjusting
+%the way the resource files are loaded. Suppose I have
+%\texttt{regions-}\meta{tag}\texttt{.ldf} resource files, then
+%\begin{verbatim}
+%\TrackLangRequireDialect{regions}{\this@dialect}
+%\end{verbatim}
+%loads the resource file for the dialect given by \cs{this@dialect}
+%using
+%\begin{verbatim}
+%\TrackLangRequireResource{\CurrentTrackedTag}
+%\end{verbatim}
+%I can use the optional argument to also load the resource file for the
+%root language as well:
+%\begin{verbatim}
+%\newcommand*{\RequireRegionsDialect}[1]{%
+% \TrackLangRequireDialect
+%    [\TrackLangRequireResource{\CurrentTrackedTag}%
+%     \TrackLangRequireResource{\CurrentTrackedLanguage}%
+%    ]%
+%    {regions}{#1}%
+%}
+%\end{verbatim}
+%Now the dialect \texttt{british} can load both
+%\texttt{regions-GB.ldf} and \texttt{regions-english.ldf}.
+%
+%The example package (\texttt{regions.sty}) below illustrates this.
+%\begin{verbatim}
+%\NeedsTeXFormat{LaTeX2e}
+%\ProvidesPackage{regions}
+%
+%\RequirePackage{tracklang}[2016/10/07]
+%
+%\DeclareOption*{\TrackLanguageTag{\CurrentOption}}
+%\ProcessOptions
+%
+%\newcommand*{\weightunit}{kg}
+%\newcommand*{\lengthunit}{mm}
+%\newcommand*{\currencyunit}{EUR}
+%
+%\newcommand*{\unitname}{units}
+%
+%\newcommand*{\RequireRegionsDialect}[1]{%
+% \TrackLangRequireDialect
+%    [\TrackLangRequireResource{\CurrentTrackedTag}%
+%     \TrackLangRequireResource{\CurrentTrackedLanguage}%
+%    ]%
+%    {regions}{#1}%
+%}
+%
+%\AnyTrackedLanguages
+%{%
+%  \ForEachTrackedDialect{\this@dialect}{%
+%    \RequireRegionsDialect\this@dialect
+%  }%
+%}
+%{% no tracked languages, default already set up
+%}
+%
+%\endinput
+%\end{verbatim}
+%There are separate \texttt{.ldf} files for region and language.
+%First are the regions.
+%
+%\begin{itemize}
+%\item \texttt{regions-BE.ldf} (Belgium):
+%\begin{verbatim}
+%\TrackLangProvidesResource{BE}
+%
+%\providecommand*{\BEunits}{%
+%  \renewcommand*{\weightunit}{kg}%
+%  \renewcommand*{\lengthunit}{mm}%
+%  \renewcommand*{\currencyunit}{EUR}%
+%}
+%
+%\TrackLangAddToCaptions{\BEunits}
+%\end{verbatim}
+%
+%\item \texttt{regions-CA.ldf} (Canada):
+%\begin{verbatim}
+%\TrackLangProvidesResource{CA}
+%
+%\providecommand*{\CAunits}{%
+%  \renewcommand*{\weightunit}{kg}%
+%  \renewcommand*{\lengthunit}{mm}%
+%  \renewcommand*{\currencyunit}{CAD}%
+%}
+%
+%\TrackLangAddToCaptions{\CAunits}
+%\end{verbatim}
+%
+%\item \texttt{regions-GB.ldf} (Great Britain):
+%\begin{verbatim}
+%\TrackLangProvidesResource{GB}
+%
+%\providecommand*{\GBunits}{%
+%  \renewcommand*{\weightunit}{kg}%
+%  \renewcommand*{\lengthunit}{mm}%
+%  \renewcommand*{\currencyunit}{GBP}%
+%}
+%
+%\TrackLangAddToCaptions{\GBunits}
+%\end{verbatim}
+%
+%\item \texttt{regions-US.ldf} (USA):
+%\begin{verbatim}
+%\TrackLangProvidesResource{US}
+%
+%\providecommand*{\USunits}{%
+%  \renewcommand*{\weightunit}{lb}%
+%  \renewcommand*{\lengthunit}{in}%
+%  \renewcommand*{\currencyunit}{USD}%
+%}
+%
+%\TrackLangAddToCaptions{\USunits}
+%\end{verbatim}
+%\end{itemize}
+%Now the language files:
+%
+%\begin{itemize}
+%\item \texttt{regions-dutch.ldf}:
+%\begin{verbatim}
+%\TrackLangProvidesResource{dutch}
+%
+%\providecommand*{\dutchnames}{%
+%  \renewcommand*{\unitname}{meeteenheden}%
+%}
+%
+%\TrackLangAddToCaptions{\dutchnames}
+%\end{verbatim}
+%
+%\item \texttt{regions-english.ldf}:
+%\begin{verbatim}
+%\TrackLangProvidesResource{english}
+%
+%\providecommand*{\englishnames}{%
+%  \renewcommand*{\unitname}{units}%
+%}
+%
+%\TrackLangAddToCaptions{\englishnames}
+%\end{verbatim}
+%
+%\item \texttt{regions-french.ldf}:
+%\begin{verbatim}
+%\TrackLangProvidesResource{french}
+%
+%\providecommand*{\frenchnames}{%
+%  \renewcommand*{\unitname}{unit\'es}%
+%}
+%
+%\TrackLangAddToCaptions{\frenchnames}
+%\end{verbatim}
+%
+%\item \texttt{regions-german.ldf}:
+%\begin{verbatim}
+%\TrackLangProvidesResource{french}
+%
+%\providecommand*{\germannames}{%
+%  \renewcommand*{\unitname}{Ma\ss einheiten}%
+%}
+%
+%\TrackLangAddToCaptions{\germannames}
+%\end{verbatim}
+%\end{itemize}
+%
+%Here's an example document that uses this package:
+%\begin{verbatim}
+%\documentclass[canadien]{article}
+%
+%\usepackage{regions}
+%
+%\begin{document}
+%
+%\unitname: \weightunit, \lengthunit, \currencyunit.
+%
+%\end{document}
+%\end{verbatim}
+%
+%This works because the \meta{tag} search looks for the
+%country code before the root language label. However, this will fail if 
+%the dialect label is the same as a root language label that has an
+%associated territory, marked with \fnregion\ in
+%\tableref{tab:rootlangopts}, as then it will be picked up before the
+%country code.
+%
+%In the above example, 
+%\texttt{regions-CA.ldf} is matched rather than
+%\texttt{regions-french.ldf}, so \texttt{regions-CA.ldf} is loaded by
+%\begin{verbatim}
+%\TrackLangRequireResource{\CurrentTrackedTag}
+%\end{verbatim}
+%After this, the language file \texttt{regions-french.ldf} is then loaded:
+%\begin{verbatim}
+%\TrackLangRequireResource{\CurrentTrackedLanguage}
+%\end{verbatim}
+%
+%This assumes that there's a country code \texttt{.ldf} file
+%available. This example needs a little modification to use default
+%units in case the region is missing:
+%\begin{verbatim}
+%\NeedsTeXFormat{LaTeX2e}
+%\ProvidesPackage{regions}
+%
+%% Pass all options to tracklang:
+%\DeclareOption*{\PassOptionsToPackage{\CurrentOption}{tracklang}}
+%\ProcessOptions
+%
+%\RequirePackage{tracklang}
+%
+%\newcommand*{\weightunit}{kg}
+%\newcommand*{\lengthunit}{mm}
+%\newcommand*{\currencyunit}{EUR}
+%
+%\newcommand*{\unitname}{units}
+%
+%\newcommand*{\defaultunits}{%
+%  \renewcommand*{\weightunit}{kg}%
+%  \renewcommand*{\lengthunit}{mm}%
+%  \renewcommand*{\currencyunit}{EUR}%
+%}
+%
+%\newcommand*{\RequireRegionsDialect}[1]{%
+%    \TrackLangRequireDialect
+%    [\TrackLangRequireResource{\CurrentTrackedTag}%
+%      \ifx\CurrentTrackedTag\CurrentTrackedLanguage
+%        \TrackLangAddToCaptions{\defaultunits}%
+%      \else
+%        \TrackLangRequireResource{\CurrentTrackedLanguage}%
+%      \fi
+%    ]%
+%    {regions}{#1}%
+%}
+%
+%\AnyTrackedLanguages
+%{%
+%  \ForEachTrackedDialect{\this@dialect}{%
+%    \RequireRegionsDialect\this@dialect
+%  }%
+%}
+%{% no tracked languages, default already set up
+%}
+%
+%\endinput
+%\end{verbatim} 
+%Note that we still have a problem for dialect labels that are
+%identical to root language labels with an associated territory (such
+%as \pkgopt{manx}). This case can be checked with the following
+%adjustment:
+%\begin{verbatim}
+%\newcommand*{\RequireRegionsDialect}[1]{%
+%    \TrackLangRequireDialect
+%    [\TrackLangRequireResource{\CurrentTrackedTag}%
+%      \ifx\CurrentTrackedTag\CurrentTrackedLanguage
+%        \ifx\CurrentTrackedRegion\empty
+%          \TrackLangAddToCaptions{\defaultunits}%
+%        \else
+%          \TrackLangRequireResource{\CurrentTrackedRegion}%
+%        \fi
+%      \else
+%        \TrackLangRequireResource{\CurrentTrackedLanguage}%
+%      \fi
+%    ]%
+%    {regions}{#1}%
+%}
+%\end{verbatim}
+%In the case where both the dialect and root language label are
+%\texttt{manx} with the resource files \texttt{regions-manx.ldf}
+%and \texttt{regions-IM.ldf}, then \cs{CurrentTrackedTag} will be
+%\texttt{manx} (the dialect label) so \texttt{regions-manx.ldf} will
+%be loaded with:
+%\begin{verbatim}
+%\TrackLangRequireResource{\CurrentTrackedTag}
+%\end{verbatim}
+%In this case \cs{CurrentTrackedRegion} is \texttt{IM} (that is, it's
+%not empty) so then \texttt{regions-IM.ldf} will be loaded with:
+%\begin{verbatim}
+%\TrackLangRequireResource{\CurrentTrackedRegion}
+%\end{verbatim}
+%
+%Here's another document that sets up dialects with
+%\styfmt{tracklang} labels that aren't recognised by \sty{babel}.
+%This means that there's no corresponding \cs{captions\ldots} hook
+%for either the dialect label or the root language label,
+%so mappings need to be defined from the \styfmt{tracklang} dialect
+%label to the matching \sty{babel} dialect label.
+%
+%\begin{verbatim}
+%\documentclass{article}
+%
+%\usepackage{tracklang}
+%
+%\TrackLanguageTag{de-US-1996}
+%\SetTrackedDialectLabelMap{\TrackLangLastTrackedDialect}{ngerman}
+%
+%\TrackLanguageTag{en-MT}
+%\SetTrackedDialectLabelMap{\TrackLangLastTrackedDialect}{UKenglish}
+%
+%\usepackage[main=ngerman,UKenglish]{babel}
+%\usepackage{regions}
+%
+%\begin{document}
+%\selectlanguage{ngerman}
+%
+%\unitname: \weightunit, \lengthunit, \currencyunit.
+%
+%\selectlanguage{UKenglish}
+%
+%\unitname: \weightunit, \lengthunit, \currencyunit.
+%
+%\end{document}
+%\end{verbatim}
+%This produces:
+%\begin{quote}
+%Ma\ss einheiten: lb, in, USD.
+%
+%units: kg, mm, EUR.
+%\end{quote}
+%Compare this with:
+%\begin{verbatim}
+%\documentclass{article}
+%
+%\usepackage[main=ngerman,UKenglish]{babel}
+%\usepackage{regions}
+%
+%\begin{document}
+%\selectlanguage{ngerman}
+%
+%\unitname: \weightunit, \lengthunit, \currencyunit.
+%
+%\selectlanguage{UKenglish}
+%
+%\unitname: \weightunit, \lengthunit, \currencyunit.
+%
+%\end{document}
+%\end{verbatim}
+%which produces:
+%\begin{quote}
+%Ma\ss einheiten: kg, mm, EUR.
+%
+%units: kg, mm, GBP.
+%\end{quote}
+%
+%Note that these mappings aren't needed if \sty{babel}
+%is loaded with the root language labels instead. For example:
+%\begin{verbatim}
+%\documentclass{article}
+%
+%\usepackage{tracklang}
+%
+%\TrackLanguageTag{de-US-1996}
+%\SetTrackedDialectLabelMap{\TrackLangLastTrackedDialect}{ngerman}
+%
+%\TrackLanguageTag{en-MT}
+%
+%\usepackage[main=ngerman,english]{babel}
+%\usepackage{regions2}
+%
+%\begin{document}
+%\selectlanguage{ngerman}
+%
+%\unitname: \weightunit, \lengthunit, \currencyunit.
+%
+%\selectlanguage{english}
+%
+%\unitname: \weightunit, \lengthunit, \currencyunit.
+%
+%\end{document}
+%\end{verbatim}
+%No mapping is required for the \texttt{en-MT} locale as
+%it can pick up \cs{captionsenglish} when \cs{TrackLangAddToHook}
+%(used by \cs{TrackLangAddToCaptions})
+%queries the root language label after failing to find the
+%language hook from the dialect label.
+%
+%Some of the predefined \styfmt{tracklang} dialects come with
+%a mapping to the closest matching \sty{babel} dialect label.
+%For example, the option \pkgopt{ngermanDE} listed in
+%\tableref{tab:nonisoopts} automatically provides a mapping
+%to \texttt{ngerman}. Since a \styfmt{tracklang} dialect label 
+%can only map to one \styfmt{babel} label, this can be problematic
+%for synonymous labels such as
+%\texttt{british}\slash\texttt{UKenglish} or
+%\texttt{american}\slash\texttt{USenglish}. The default mappings used
+%by \styfmt{tracklang} are shown in \tableref{tab:nonisoopts}.
+%
+%\chapter{Adding Support for Language Tracking}
+%\label{sec:langsty}
+%
+%If you are writing a package that \emph{sets up} the document languages (rather
+%than a package that provides multilingual support if the user has
+%already loaded a language package) then you can load \styfmt{tracklang}
+%and use the commands below to help other packages track your
+%provided languages.
+%
+%The \styfmt{tracklang} package can be loaded using
+%\begin{verbatim}
+%\input tracklang
+%\end{verbatim}
+%or (\LaTeX\ only)
+%\begin{verbatim}
+%\RequirePackage{tracklang}
+%\end{verbatim}
+%
+%When using \LaTeX, there's a difference between the two.
+%The first case prevents \styfmt{tracklang} from picking up
+%the document class options but skips the check for known
+%language packages. This check is redundant since this is
+%the language package, so the thing to decide is whether or
+%not to allow the user to set up the localisation information
+%through the document class options.
+%
+%(If you just use \cs{input}, there's a test at the start of
+%\texttt{tracklang.tex} to determine if it's already been loaded, so
+%you don't need to worry if the user has already loaded it.)
+%
+%When the language is set (using commands like \cs{selectlanguage}
+%)
+%it would be convenient to users and other packages if the 
+%following command is also used:
+%\begin{definition}[\DescribeMacro\SetCurrentTrackedDialect]
+%\cs{SetCurrentTrackedDialect}\marg{dialect}
+%\end{definition}
+%where \meta{dialect} may the \styfmt{tracklang} dialect label,
+%or the mapped label previously set through \cs{SetTrackedDialectLabelMap},
+%described below, or the language label (in which case the
+%last dialect to be tracked with that root language will
+%be assumed).
+%
+%This will make the following commands available which may be
+%of use to other packages:
+%\begin{itemize}
+%\item\ics{CurrentTrackedDialect} The dialect label recognised
+%by \styfmt{tracklang} (which may not be the same as \meta{dialect}).
+%
+%\item\ics{CurrentTrackedLanguage}
+%The root language label used by \styfmt{tracklang}.
+%\item\ics{CurrentTrackedDialectModifier} The dialect modifier.
+%\item\ics{CurrentTrackedDialectVariant} The dialect variant.
+%\item\ics{CurrentTrackedDialectScript} The dialect script.
+%Note that if \sty{tracklang-scripts} is also loaded, this allows the
+%script direction to be accessed using
+%\begin{verbatim}
+%\TrackLangScriptAlphaToDir{\CurrentTrackedDialectScript}
+%\end{verbatim}
+%See \sectionref{sec:tracklang-scripts.tex} for further details.
+%\item\ics{CurrentTrackedDialectSubLang} The dialect sub-language
+%code.
+%\item\ics{GetTrackedDialectAdditional} The dialect's additional
+%information.
+%\item\ics{CurrentTrackedIsoCode} The dialect's root language 
+%ISO code. (The first found in the sequence 639-1, 639-2, 639-3.)
+%\item\ics{CurrentTrackedRegion} The dialect's ISO 3166-1 region 
+%code.
+%\item\ics{CurrentTrackedLanguageTag} The dialect's language tag.
+%\end{itemize}
+%(Without this automated use of \cs{SetCurrentTrackedDialect},
+%the same information can be picked up using commands
+%like \cs{GetTrackedDialectScript}, but that's less convenient,
+%especially if \cs{languagename} needs to be converted
+%to \meta{dialect}. See the accompanying sample file
+%\texttt{sample-setlang.tex} for an example.)
+%
+%When the user requests a particular dialect through your language
+%package, you can notify \styfmt{tracklang} of this choice using
+%\begin{definition}
+%\cs{TrackPredefinedDialect}\marg{dialect}
+%\end{definition}
+%if the dialect label is recognised by \styfmt{tracklang} (all those
+%listed in \refoptstables).
+%
+%If there's no matching dialect predefined by \styfmt{tracklang}, you
+%can just use \cs{TrackLocale} or \cs{TrackLanguageTag} 
+%(described in \sectionref{sec:generic}) 
+%with the appropriate ISO codes \emph{if you're not providing caption
+%hooks}.
+%
+%If you are providing a captions hook mechanism
+%in the form \ics{captions\meta{dialect}}, then if \meta{dialect}
+%doesn't match the corresponding \styfmt{tracklang} dialect label,
+%you can provide a mapping using
+%\cs{SetTrackedDialectLabelMap}, described below.
+%
+%For compatibility with pre version 1.3, 
+%if the dialect isn't predefined by
+%\styfmt{tracklang}, then you can use:
+%\begin{definition}[\DescribeMacro\AddTrackedDialect]
+%\cs{AddTrackedDialect}\marg{dialect}\marg{root language label}
+%\end{definition}
+%where \meta{root language label} is the label for the dialect's root
+%language (\tableref{tab:rootlangopts}) and \meta{dialect} matches
+%the captions hook. If the dialect is already in the tracked dialect
+%list, it won't be added again. If the root language is already in
+%the tracked language list, it won't be added again. As from version
+%1.3 this additionally defines:
+%\begin{definition}[\DescribeMacro\TrackLangLastTrackedDialect]
+%\cs{TrackLangLastTrackedDialect}
+%\end{definition}
+%to \meta{dialect} for convenient reference if required.
+%Note that \cs{AddTrackedDialect} is internally used by commands like
+%\cs{TrackPredefinedDialect}, \cs{TrackLocale} and
+%\cs{TrackLanguageTag}.
+%
+%(New to version 1.3.) Many of the \styfmt{tracklang} dialect
+%labels don't have a corresponding match in various language packages. For 
+%example, \styfmt{tracklang} provides \texttt{ngermanDE} but the
+%closest match in \sty{babel} is \texttt{ngerman}. This means that
+%the caption hook \cs{captionsngerman} can't be accessed
+%through
+%\begin{verbatim}
+%\csname captions\CurrentTrackedDialect\endcsname
+%\end{verbatim}
+%in the resource files. In this case, a mapping may be defined
+%between the \styfmt{tracklang} dialect label and the closest
+%matching label used by the language hooks. This is done through
+%\begin{definition}[\DescribeMacro\SetTrackedDialectLabelMap]
+%\cs{SetTrackedDialectLabelMap}\marg{from}\marg{to}
+%\end{definition}
+%where \meta{from} is the \styfmt{tracklang} label and \meta{to}
+%is the language hook label. For example:
+%\begin{verbatim}
+%\TrackLanguageTag{de-AR-1996}
+%\SetTrackedDialectLabelMap{\TrackLangLastTrackedDialect}{ngerman}
+%\end{verbatim}
+%Since \cs{TrackLanguageTag} internally uses \cs{AddTrackedDialect}
+%the dialect label created by \styfmt{tracklang} can be accessed
+%using \cs{TrackLangLastTrackedDialect}. This means that
+%\ics{TrackLangAddToCaptions} can now find the \cs{captionsngerman}
+%hook even though the \styfmt{tracklang} dialect label isn't \texttt{ngerman}.
+%
+%(New to version 1.3.)
+%If the root language label is recognised by \styfmt{tracklang}, you
+%can add the ISO codes using:
+%\begin{definition}[\DescribeMacro\AddTrackedLanguageIsoCodes]
+%\cs{AddTrackedLanguageIsoCodes}\marg{root language}
+%\end{definition}
+%
+%As from v1.3, you can also provide a modifier for a given
+%dialect using:
+%\begin{definition}[\DescribeMacro\SetTrackedDialectModifier]
+%\cs{SetTrackedDialectModifier}\marg{dialect}\marg{value}
+%\end{definition}
+%where \meta{dialect} is the dialect label and \meta{value}
+%is the modifier value. For example:
+%\begin{verbatim}
+%\AddTrackedDialect{oldgerman}{german}
+%\AddTrackedLanguageIsoCodes{german}
+%\SetTrackedDialectModifier{oldgerman}{old}
+%\end{verbatim}
+%
+%Note that no sanitization is performed on \meta{value} when the
+%modifier is set explicitly through \cs{SetTrackedDialectModifier},
+%since it's assumed that any package that specifically sets the
+%modifier in this way is using a sensible labelling system. If the
+%modifier is obtained through commands like \cs{TrackLocale}, then
+%the modifier is sanitized as the value may have been obtained from
+%the operating system and there's no guarantee that it won't contain
+%problematic characters.
+%
+%The modifier is typically obtained by parsing locale information in
+%POSIX format.
+%\begin{display}
+%\meta{language}[\_\meta{territory}][.\meta{codeset}][@\meta{modifier}]
+%\end{display}
+%whereas the variant is typically obtained by parsing the language
+%tag.
+%
+%The information provided in the commands below (such as the script)
+%are typically obtained by parsing the language tag. For example,
+%with Serbian in the Latin alphabet the modifier would be \texttt{latin}
+%whereas the script would be \texttt{Latn}:
+%\begin{verbatim}
+%\AddTrackedDialect{serbianlatin}{serbian}
+%\AddTrackedLanguageIsoCodes{serbian}
+%\SetTrackedDialectModifier{serbianlatin}{latin}
+%\SetTrackedDialectScript{serbianlatin}{Latn}
+%\end{verbatim}
+%
+%As from v1.3, you can provide a script (for example,
+%\qt{Latn} or \qt{Cyrl}) using:
+%\begin{definition}[\DescribeMacro\SetTrackedDialectScript]
+%\cs{SetTrackedDialectScript}\marg{dialect}\marg{value}
+%\end{definition}
+%where \meta{dialect} is the dialect label and \meta{value} is the
+%four letter script identifier. For example:
+%\begin{verbatim}
+%\AddTrackedDialect{serbiancyrl}{serbian}
+%\AddTrackedLanguageIsoCodes{serbian}
+%\SetTrackedDialectScript{serbiancyrl}{Cyrl}
+%\end{verbatim}
+%
+%As from v1.3, you can provide a variant for a given
+%dialect using:
+%\begin{definition}[\DescribeMacro\SetTrackedDialectVariant]
+%\cs{SetTrackedDialectVariant}\marg{dialect}\marg{value}
+%\end{definition}
+%For example:
+%\begin{verbatim}
+%\AddTrackedDialect{german1901}{german}
+%\SetTrackedDialectVariant{german1901}{1901}
+%\end{verbatim}
+%
+%As from v1.3, you can also provide a sub-language using:
+%\begin{definition}[\DescribeMacro\SetTrackedDialectSubLang]
+%\cs{SetTrackedDialectSubLang}\marg{dialect}\marg{value}
+%\end{definition}
+%where \meta{dialect} is the dialect label and \meta{value} is the
+%code. For example:
+%\begin{verbatim}
+%\AddTrackedDialect{mandarin}{chinese}
+%\AddTrackedLanguageIsoCodes{chinese}
+%\SetTrackedDialectSubLang{mandarin}{cmn}
+%\AddTrackedIsoLanguage{639-3}{cmn}{mandarin}
+%\end{verbatim}
+%
+%As from v1.3, you can also provide additional information using:
+%\begin{definition}[\DescribeMacro\SetTrackedDialectAdditional]
+%\cs{SetTrackedDialectAdditional}\marg{dialect}\marg{value}
+%\end{definition}
+%where \meta{dialect} is the dialect label and \meta{value} is the
+%additional information.
+%
+%(New to version 1.3.)
+%If the root language isn't recognised by \styfmt{tracklang}
+%(not listed in \tableref{tab:rootlangopts}), then
+%it can be defined (but not tracked at this point) using:
+%\begin{definition}[\DescribeMacro\TrackLangNewLanguage]
+%\cs{TrackLangNewLanguage}\marg{language name}\marg{639-1
+%code}\marg{639-2 (T)}\marg{639-2 (B)}\marg{639-3}\marg{3166-1}\marg{default
+%script}
+%\end{definition}
+%where \meta{language name} is the root language name, 
+%\meta{639-1 code} is the ISO 639-1 code for that language (may be
+%empty if there isn't one), \meta{639-2 (T)} is the ISO 639-2 (T)
+%code for that language (may be empty if there isn't one),
+%\meta{639-2 (B)} is the ISO 639-2 (B) code for that language (may be
+%empty if it's the same as \meta{639-2 (T)}), \meta{639-3} is the ISO
+%639-3 code for that language (empty if the same as the 639-2
+%code), \meta{3166-1} is the territory ISO code for languages that are only spoken in one
+%territory (should be empty if the language is spoken in multiple
+%territories), and \meta{default script} is the default script (empty
+%if disputed or varies according to region).
+%
+%You can then track this language using \cs{AddTrackedDialect} for
+%dialects or, if no regional variant is needed, you can instead use:
+%\begin{definition}[\DescribeMacro\AddTrackedLanguage]
+%\cs{AddTrackedLanguage}\marg{root language label}
+%\end{definition}
+%This is equivalent to \ics{AddTrackedDialect}\marg{root language
+%label}\marg{root language label}.
+%
+%Suppose I want to create a language package \texttt{alien.sty} that defines the
+%\texttt{martian} language with regional dialects
+%\texttt{lowermartian} and \texttt{uppermartian}. First, let's
+%suppose that \styfmt{tracklang} recognises the root language
+%\texttt{martian}:
+%\begin{verbatim}
+% \ProvidesPackage{alien}
+%
+% \input{tracklang}% v1.3
+%
+% \DeclareOption{martian}{%
+%   \TrackPredefinedDialect{martian}
+% }
+% \DeclareOption{lowermartian}{%
+%   \AddTrackedDialect{lowermartian}{martian}
+%   \AddTrackedIsoCodes{martian}
+%   \AddTrackedIsoLanguage{3166-1}{YY}{lowermartian}
+%   % other attributes such as
+%   % \SetTrackedDialectVariant{lowermartian}{...}
+% }
+% \DeclareOption{uppermartian}{%
+%   \AddTrackedDialect{uppermartian}{martian}
+%   \AddTrackedIsoCodes{martian}
+%   \AddTrackedIsoLanguage{3166-1}{XX}{uppermartian}
+%   % other attributes such as
+%   % \SetTrackedDialectVariant{uppermartian}{...}
+% }
+%
+% \ProcessOptions
+%
+% \newcommand*{\selectlanguage}[1]{%
+%   \def\languagename{#1}%
+%   % other stuff
+%   \SetCurrentTrackedDialect{#1}% 
+% }
+%
+% \AnyTrackedLanguages
+% {
+%   \ForEachTrackedDialect{\thisdialect}
+%   {%
+%     \TrackLangRequireDialect{alien}{\thisdialect}
+%   }
+% }
+%\end{verbatim}
+%The caption commands and language set up are in the files
+%\texttt{alien-}\meta{tag}\texttt{.ldf} as in the examples from
+%\sectionref{sec:examples}. This allows for the user having already
+%loaded \styfmt{tracklang} before \styfmt{alien} and used \cs{TrackLangFromEnv} to pick up
+%the locale from the operating system's environment variables.
+%(For example, they may have \envvar{LANG} set to \texttt{xx\_YY}.)
+%
+%The resource files may need to set the mapping between the
+%\styfmt{tracklang} dialect label and the \styfmt{alien} dialect
+%label. For example, in \texttt{alien-xx-YY.ldf}:
+%\begin{verbatim}
+%\TrackLangProvidesResource{xx-YY}
+%
+%\TrackLangRequireResource{martian}% load common elements
+%
+%\newcommand{\captionslowermartian}{%
+%  \captionsmartian
+%  \def\contentsname{X'flurp}% regional variation
+%}
+%
+%\SetTrackedDialectLabelMap{\CurrentTrackedDialect}{lowermartian}
+%\end{verbatim}
+%
+%Now let's consider the case where \styfmt{tracklang} doesn't know
+%about the \texttt{martian} language. In this case the user can't 
+%track the dialect until the root language has been defined, so the
+%user can't use \cs{TrackLangFromEnv} before using the \styfmt{alien}
+%package.
+%
+%With \styfmt{tracklang} v1.3. The new root language can be defined
+%with a minor adjustment to the above code:
+%\begin{verbatim}
+% \ProvidesPackage{alien}
+%
+% \input{tracklang}% needs v1.3
+%
+% \TrackLangIfKnownLang{martian}
+% {}% tracklang already knows about the martian language
+% {
+%   % tracklang doesn't known about the martian language, so define it
+%   % with ISO 639-1 (xx) and ISO 639-2 (xxx) codes:
+%   \TrackLangNewLanguage{martian}{xx}{xxx}{}{}{}{Latn}
+% }
+%\end{verbatim}
+%The rest is as before.
+%
+%Now other package writers who want to provide support
+%for the Martian dialects can easily detect which language options
+%the user requested through my package, \emph{without needing to know
+%anything about my \styfmt{alien} package}.
+%
+%\StopEventually{%
+% \printindex[user]
+% \PrintCodeIndex
+% \PrintChanges
+%}
+%
+%
+%\chapter{The Code}
+%\iffalse
+%    \begin{macrocode}
+%<*tracklang.sty>
+%    \end{macrocode}
+%\fi
+%\changes{1.0}{2014-09-29}{Initial release}
+%\section{\LaTeX\ Code (\texttt{tracklang.sty})}
+% To ensure maximum portability this file only uses \LaTeX\ kernel
+% commands, rather than using more convenient commands provided by
+% packages such as \styfmt{etoolbox}.
+%    \begin{macrocode}
+\NeedsTeXFormat{LaTeX2e}
+\ProvidesPackage{tracklang}[2019/08/31 v1.3.7 (NLCT) Track Languages]
+%    \end{macrocode}
+%\begin{macro}{\@tracklang@declareoption}
+% Set up package options.
+%    \begin{macrocode}
+\providecommand*{\@tracklang@declareoption}[1]{%
+  \DeclareOption{#1}{\TrackPredefinedDialect{#1}}%
+}
+%    \end{macrocode}
+%\end{macro}
+% Load generic code:
+%    \begin{macrocode}
+\input{tracklang}
+%    \end{macrocode}
+% There are no other options as this package will typically
+% be loaded using \cs{RequirePackage} by a package. Explicitly
+% adding an option at that point might create a package option
+% clash. The declared package options are all the possible
+% language names that might be passed as a document class option.
+% (Also, adding any non-language options here will interfere
+% with \cs{@tracklang@declaredoptions}.)
+%    \begin{macrocode}
+\let\@tracklang@declaredoptions\@declaredoptions
+\ProcessOptions
+%    \end{macrocode}
+% Unset \cs{@tracklang@declareoption}:
+%    \begin{macrocode}
+\let\@tracklang@declareoption\@gobble
+%    \end{macrocode}
+%
+% In the event that the language hasn't been supplied through the
+% package options (or through the class options, which the package
+% options should process provided the document class has used the
+% standard option declarations) we need to check if any of the known
+% language packages have been loaded. This is a bit risky as it
+% relies on the packages not changing their internal language
+% macros. It would be easier if all the language packages could
+% provide a reliable user interface to determine which languages
+% (and variants) have been loaded.
+%
+%    \begin{macrocode}
+\ifx\@tracklang@languages\@empty
+%    \end{macrocode}
+% First try \sty{babel}. If \sty{babel} has been loaded, the
+% languages are stored in \cs{bbl@loaded}, so check if this command
+% has been defined, and if it has add those languages.
+%    \begin{macrocode}
+  \@ifundefined{bbl@loaded}%
+  {%
+%    \end{macrocode}
+% If \sty{translator} has been loaded, the languages are stored in
+% \cs{trans@languages}
+%    \begin{macrocode}
+    \@ifundefined{trans@languages}
+    {%
+%    \end{macrocode}
+% Has \sty{ngerman} been loaded?
+%    \begin{macrocode}
+       \@ifpackageloaded{ngerman}%
+       {%
+         \@tracklang@add@ngerman
+       }%
+       {%
+%    \end{macrocode}
+% Has \sty{german} been loaded?
+%\changes{1.3}{2016-10-07}{added test for german.sty}
+%    \begin{macrocode}
+         \@ifpackageloaded{german}%
+         {%
+           \@tracklang@add@german
+         }%
+         {%
+%    \end{macrocode}
+% Has \sty{polyglossia} been loaded? 
+%    \begin{macrocode}
+           \@ifpackageloaded{polyglossia}
+           {%
+%    \end{macrocode}
+% \sty{polyglossia} sets \cs{\meta{lang}@loaded} for each loaded
+% language, so check this for all known languages. I don't know how
+% to consistently check for variants. (Conditionals such as
+% \cs{if@british@locale} are set immediately with
+% \cs{setotherlanguage} but are deferred to the start of the
+% document with \cs{setmainlanguage}, which is too late for
+% \styfmt{tracklang}.) Script names seem to be stored in 
+% \cs{xpg:scripttag@\meta{language}} but again this doesn't seem to be set
+% for the main language until the start of the document.
+% New versions of \sty{polyglossia} store the list of loaded
+% languages in \cs{xpg@loaded}, so check if this is defined.
+%\changes{1.3}{2016-10-07}{removed hard-coded polyglossia language list}
+%\changes{1.3.5}{2018-02-21}{check for \cs{xpg@loaded}}
+%    \begin{macrocode}
+             \@ifundefined{xpg@loaded}%
+             {%
+%    \end{macrocode}
+%\cs{xpg@loaded} isn't defined, so iterate over known options and
+%check if the language has been loaded.
+%    \begin{macrocode}
+               \PackageInfo{tracklang}{polyglossia loaded but
+               \string\xpg@loaded\space not defined. Will attempt
+               to track known languages.}%
+                \@for\this@language:=\@tracklang@declaredoptions\do{%
+                  \@ifundefined{\this@language @loaded}%
+                  {}%
+                  {\@nameuse{@tracklang@add@\this@language}}%
+                }%
+             }%
+             {%
+                \@for\this@language:=\xpg@loaded\do{%
+                  \@ifundefined{@tracklang@add@\this@language}%
+                  {%
+                     \PackageWarning{tracklang}%
+                       {Adding unknown polyglossia language `\this@language'}%
+%    \end{macrocode}
+%\changes{1.3.7}{2019-08-31}{corrected misspelt command}
+%    \begin{macrocode}
+                     \AddTrackedLanguage{\this@language}%
+                  }%
+                  {\@nameuse{@tracklang@add@\this@language}}%
+                }%
+             }%
+           }%
+           {%
+%    \end{macrocode}
+% None of the known packages have been loaded, so do nothing in case
+% another package wants to load this one before setting up the
+% language options. However, if at this point \sty{babel} has been
+% loaded, then it's an older version that hasn't defined
+% \cs{bbl@loaded} so check for this.
+%    \begin{macrocode}
+             \@ifpackageloaded{babel}
+             {%
+               \PackageInfo{tracklang}{babel loaded but
+               \string\bbl@loaded\space not defined. Will attempt
+               to track known languages.}%
+               \@for\this@language:=\@tracklang@declaredoptions\do{%
+                 \@ifundefined{captions\this@language}%
+                 {}%
+                 {\@nameuse{@tracklang@add@\this@language}}%
+               }%
+             }%
+             {}%
+           }%
+         }%
+       }%
+    }%
+    {%
+%    \end{macrocode}
+% Add from \sty{translator}.
+% If \sty{translator} has been loaded, the language names are
+% stored in \cs{trans@languages} but these are labels used by
+% \sty{translator}, so some mapping is required.
+%    \begin{macrocode}
+      \let\@tracklang@add@Acadian\@tracklang@add@acadian
+      \let\@tracklang@add@French\@tracklang@add@french
+      \let\@tracklang@add@Afrikaans\@tracklang@add@afrikaans
+      \let\@tracklang@add@Dutch\@tracklang@add@dutch
+      \let\@tracklang@add@AmericanEnglish\@tracklang@add@american
+      \let\@tracklang@add@Austrian\@tracklang@add@austrian
+      \@namedef{@tracklang@add@Austrian1997}{\@tracklang@add@naustrian}
+      \let\@tracklang@add@Bahasa\@tracklang@add@bahasa
+      \let\@tracklang@add@Basque\@tracklang@add@basque
+      \let\@tracklang@add@Brazilian\@tracklang@add@brazil
+      \let\@tracklang@add@Portuguese\@tracklang@add@portuguese
+      \let\@tracklang@add@Breton\@tracklang@add@breton
+      \let\@tracklang@add@BritishEnglish\@tracklang@add@british
+      \let\@tracklang@add@Bulgarian\@tracklang@add@bulgarian
+      \let\@tracklang@add@Canadian\@tracklang@add@canadian
+      \let\@tracklang@add@Canadien\@tracklang@add@canadien
+      \let\@tracklang@add@Catalan\@tracklang@add@catalan
+      \let\@tracklang@add@Croatian\@tracklang@add@croatian
+      \let\@tracklang@add@Czech\@tracklang@add@czech
+      \let\@tracklang@add@Danish\@tracklang@add@danish
+      \let\@tracklang@add@Dutch\@tracklang@add@dutch
+      \let\@tracklang@add@English\@tracklang@add@english
+      \let\@tracklang@add@Esperanto\@tracklang@add@esperanto
+      \let\@tracklang@add@Estonian\@tracklang@add@estonian
+      \let\@tracklang@add@Finnish\@tracklang@add@finnish
+      \let\@tracklang@add@French\@tracklang@add@french
+      \let\@tracklang@add@Galician\@tracklang@add@galician
+      \let\@tracklang@add@German\@tracklang@add@german
+      \@namedef{@tracklang@add@German1997}{\@tracklang@add@ngerman}
+      \let\@tracklang@add@Greek\@tracklang@add@greek
+      \let\@tracklang@add@Polutoniko\@tracklang@add@polutoniko
+      \let\@tracklang@add@Hebrew\@tracklang@add@hebrew
+      \let\@tracklang@add@Hungarian\@tracklang@add@hungarian
+      \let\@tracklang@add@Icelandic\@tracklang@add@icelandic
+      \let\@tracklang@add@Irish\@tracklang@add@irish
+      \let\@tracklang@add@Italian\@tracklang@add@italian
+      \let\@tracklang@add@Latin\@tracklang@add@latin
+      \let\@tracklang@add@LowerSorbian\@tracklang@add@lowersorbian
+      \let\@tracklang@add@Magyar\@tracklang@add@magyar
+      \let\@tracklang@add@Nynorsk\@tracklang@add@nynorsk
+      \let\@tracklang@add@Norsk\@tracklang@add@norsk
+      \let\@tracklang@add@Polish\@tracklang@add@polish
+      \let\@tracklang@add@Portuguese\@tracklang@add@portuguese
+      \let\@tracklang@add@Romanian\@tracklang@add@romanian
+      \let\@tracklang@add@Russian\@tracklang@add@russian
+      \let\@tracklang@add@Scottish\@tracklang@add@scottish
+      \let\@tracklang@add@Serbian\@tracklang@add@serbian
+      \let\@tracklang@add@Slovak\@tracklang@add@slovak
+      \let\@tracklang@add@Slovene\@tracklang@add@slovene
+      \let\@tracklang@add@Spanish\@tracklang@add@spanish
+      \let\@tracklang@add@Swedish\@tracklang@add@swedish
+      \let\@tracklang@add@Turkish\@tracklang@add@turkish
+      \let\@tracklang@add@Ukrainian\@tracklang@add@ukrainian
+      \let\@tracklang@add@UpperSorbian\@tracklang@add@uppersorbian
+      \let\@tracklang@add@Welsh\@tracklang@add@welsh
+%    \end{macrocode}
+% Now iterate through the declared languages:
+%    \begin{macrocode}
+      \@for\this@language:=\trans@languages\do{%
+         \@ifundefined{@tracklang@add@\this@language}{}%
+         {\@nameuse{@tracklang@add@\this@language}}%
+      }%
+    }%
+  }%
+  {%
+%    \end{macrocode}
+% Add from \sty{babel}
+%    \begin{macrocode}
+    \@for\this@language:=\bbl@loaded\do{%
+       \@ifundefined{@tracklang@add@\this@language}%
+       {%
+         \PackageWarning{tracklang}%
+           {Adding unknown babel language `\this@language'}%
+%    \end{macrocode}
+%\changes{1.3.7}{2019-08-31}{corrected misspelt command}
+%    \begin{macrocode}
+         \AddTrackedLanguage{\this@language}%
+       }%
+       {\@nameuse{@tracklang@add@\this@language}}%
+     }%
+%    \end{macrocode}
+% If \sty{babel} has been loaded with \pkgoptfmt{serbian}, then 
+% the script needs to be set to \texttt{Latn}. (The Cyrillic
+% script is provided with \pkgoptfmt{serbianc}.)
+%    \begin{macrocode}
+     \ifx\captionsserbian\undefined
+     \else
+       \SetTrackedDialectScript{serbian}{Latn}%
+     \fi
+  }
+%    \end{macrocode}
+% End of check for language packages
+%    \begin{macrocode}
+\fi
+%    \end{macrocode}
+%\iffalse
+%    \begin{macrocode}
+%</tracklang.sty>
+%    \end{macrocode}
+%\fi
+%\iffalse
+%    \begin{macrocode}
+%<*tracklang.tex>
+%    \end{macrocode}
+%\fi
+%\section{Generic Code (\texttt{tracklang.tex})}
+% Does the category code of \verb|@| need changing?
+%\changes{1.3}{2016-10-07}{added check for @ category code}
+%\begin{macro}{\@tracklang@restore@at}
+%    \begin{macrocode}
+\ifnum\catcode`\@=11\relax
+  \def\@tracklang@restore@at{}%
+\else
+  \expandafter\edef\csname @tracklang@restore@at\endcsname{%
+    \noexpand\catcode`\noexpand\@=\number\catcode`\@\relax
+  }%
+ \catcode`\@=11\relax
+\fi
+%    \end{macrocode}
+%\end{macro}
+% First check if this file has already been loaded:
+%    \begin{macrocode}
+\ifx\@tracklang@languages\undefined
+\else
+  \@tracklang@restore@at
+  \expandafter\endinput
+\fi
+%    \end{macrocode}
+% Version info.
+%    \begin{macrocode}
+\expandafter\def\csname ver@tracklang.tex\endcsname{%
+ 2019/08/31 v1.3.7 (NLCT) Track Languages Generic Code}
+%    \end{macrocode}
+% Define a long command for determining the existence of a control
+% sequence by its name. (\cs{relax} is considered undefined.)
+%\begin{macro}{\@tracklang@ifundef}
+%    \begin{macrocode}
+\long\def\@tracklang@ifundef#1#2#3{%
+  \ifcsname#1\endcsname
+    \expandafter\ifx\csname #1\endcsname\relax
+      #2%
+    \else 
+      #3%
+    \fi
+  \else
+    \expandafter\ifx\csname #1\endcsname\relax
+      #2%
+    \else 
+      #3%
+    \fi
+  \fi
+}
+%    \end{macrocode}
+%\changes{1.3}{2016-10-07}{added check for \cs{ifcsname}}
+%\cs{ifcsname} is an e\TeX\ primitive. Need to check if it's
+%defined.
+%    \begin{macrocode}
+\ifx\ifcsname\undefined
+%    \end{macrocode}
+%Not using e\TeX.
+%    \begin{macrocode}
+  \long\def\@tracklang@ifundef#1#2#3{%
+    \expandafter\ifx\csname #1\endcsname\relax
+      #2%
+    \else 
+      #3%
+    \fi
+  }
+%    \end{macrocode}
+%Can't have an else part here as \TeX\ won't recognise
+%\cs{ifcsname} and we'll have an unmatched end brace.
+%    \begin{macrocode}
+\fi
+%    \end{macrocode}
+%\end{macro}
+%
+% The shell escape stuff needs the Plain \TeX\ version of
+% \cs{input}. This is \cs{@@input} if we're using \LaTeX.
+%\begin{macro}{\@tracklang@input}
+%    \begin{macrocode}
+\ifx\@@input\undefined
+   \let\@tracklang@input\input
+\else
+   \let\@tracklang@input\@@input
+\fi
+%    \end{macrocode}
+%\end{macro}
+%
+% Provide some commands in case the \LaTeX\ kernel hasn't been loaded.
+%\begin{macro}{\@tracklang@nnil}
+%    \begin{macrocode}
+\ifx\@nnil\undefined
+  \def\@tracklang@nnil{\@nil}
+\else
+  \let\@tracklang@nnil\@nnil
+\fi
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@for}
+%    \begin{macrocode}
+\ifx\@for\undefined
+  \long\def\@tracklang@for#1:=#2\do#3{%
+    \expandafter\def\expandafter\@fortmp\expandafter{#2}%
+    \ifx\@fortmp\empty
+    \else
+      \expandafter
+        \@tracklang@forloop #2,\@nil,\@nil\@@ #1{#3}%
+    \fi
+  }
+  \long\def\@tracklang@forloop#1,#2,#3\@@ #4#5{%
+   \def #4{#1}%
+   \ifx#4\@tracklang@nnil
+   \else
+     #5%
+     \def #4{#2}%
+     \ifx#4\@tracklang@nnil
+     \else
+       #5%
+       \@tracklang@iforloop #3\@@ #4{#5}%
+     \fi
+   \fi
+  }
+  \long\def\@tracklang@iforloop#1,#2\@@ #3#4{%
+    \def#3{#1}%
+    \ifx#3\@tracklang@nnil
+      \expandafter
+        \@tracklang@fornoop
+    \else
+      #4\relax
+      \expandafter\@tracklang@iforloop
+    \fi
+    #2\@@ #3{#4}%
+  }
+  \long\def\@tracklang@fornoop#1\@@ #2#3{}
+\else
+  \let\@tracklang@for\@for
+\fi
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@namedef}
+%    \begin{macrocode}
+\ifx\@namedef\undefined
+  \def\@tracklang@namedef#1{\expandafter\def\csname#1\endcsname}
+\else
+  \let\@tracklang@namedef\@namedef
+\fi
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@enamedef}
+%\changes{1.3}{2016-10-07}{new}
+%    \begin{macrocode}
+\def\@tracklang@enamedef#1{\expandafter\edef\csname#1\endcsname}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@nameuse}
+%\changes{1.3}{2016-10-07}{added check for undef}
+%    \begin{macrocode}
+\def\@tracklang@nameuse#1{%
+  \@tracklang@ifundef{#1}{}{\csname#1\endcsname}%
+}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@sanitize}
+%\changes{1.3}{2016-10-07}{new}
+%    \begin{macrocode}
+\ifx\@onelevel@sanitize\undefined
+  \def\@tracklang@sanitize#1{%
+    \edef#1{\expandafter\@tracklang@strip@prefix\meaning#1}%
+  }
+  \def\@tracklang@strip@prefix#1>{}
+\else
+  \let\@tracklang@sanitize\@onelevel@sanitize
+\fi
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@firstoftwo}
+%\changes{1.3}{2016-10-07}{new}
+%    \begin{macrocode}
+\def\@tracklang@firstoftwo#1#2{#1}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@secondoftwo}
+%\changes{1.3}{2016-10-07}{new}
+%    \begin{macrocode}
+\def\@tracklang@secondoftwo#1#2{#2}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@err}
+%\changes{1.3.4}{2017-03-25}{fixed typo in \cs{errhelp} command name}
+%    \begin{macrocode}
+\ifx\PackageError\undefined
+  \def\@tracklang@err#1#2{%
+    \errhelp{#2}%
+    \errmessage{tracklang: #1}}
+\else
+  \def\@tracklang@err#1#2{\PackageError{tracklang}{#1}{#2}}
+\fi
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\ifTrackLangShowWarnings}
+%\changes{1.3}{2016-10-07}{new}
+%Allow user to switch warnings on or off.
+%    \begin{macrocode}
+\newif\ifTrackLangShowWarnings
+\TrackLangShowWarningstrue
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@pkgwarn}
+%\changes{1.3.4}{2017-03-25}{new}
+%Provided for related packages such as \sty{texosquery}.
+%    \begin{macrocode}
+\ifx\PackageWarning\undefined
+  \def\@tracklang@pkgwarn#1#2{%
+    \ifTrackLangShowWarnings
+      {%
+        \newlinechar=`\^^J
+        \def\MessageBreak{^^J}%
+        \message{^^J#1 Warning: #2 on line \the\inputlineno.^^J}%
+      }%
+    \fi
+  }
+\else
+  \def\@tracklang@pkgwarn#1#2{%
+    \ifTrackLangShowWarnings
+      \PackageWarning{#1}{#2}%
+    \fi
+  }
+\fi
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@warn}
+%\changes{1.3}{2016-10-07}{new}
+%    \begin{macrocode}
+\def\@tracklang@warn#1{\@tracklang@pkgwarn{tracklang}{#1}}%
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\ifTrackLangShowInfo}
+%\changes{1.3}{2016-10-07}{new}
+%Allow user to switch information messages on or off.
+%    \begin{macrocode}
+\newif\ifTrackLangShowInfo
+\TrackLangShowInfotrue
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@info}
+%\changes{1.3}{2016-10-07}{new}
+%    \begin{macrocode}
+\ifx\PackageInfo\undefined
+  \def\@tracklang@info#1{%
+   \ifTrackLangShowInfo
+     {%
+       \newlinechar=`\^^J
+       \def\MessageBreak{^^J}%
+       \message{^^Jtracklang Info: #1 on line \the\inputlineno.^^J}%
+     }%
+   \fi
+  }%
+\else
+  \def\@tracklang@info#1{%
+    \ifTrackLangShowInfo
+      \PackageInfo{tracklang}{#1}%
+    \fi
+  }%
+\fi
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@IfFileExists}
+%    \begin{macrocode}
+\ifx\IfFileExists\undefined
+ \long\def\@tracklang@IfFileExists#1#2#3{%
+   \openin0=#1 %
+   \ifeof0\relax
+     \def\@tracklang@tmp{#3}%
+   \else
+     \closein0\relax
+     \edef\@filef@und{#1 }%
+     \def\@tracklang@tmp{#2}%
+   \fi
+   \@tracklang@tmp
+ }
+
+\else
+  \let\@tracklang@IfFileExists\IfFileExists
+\fi
+%    \end{macrocode}
+%\end{macro}
+%
+%Provide a way to query the environment variables \envvar{LC\_ALL}
+%or \envvar{LANG} to determine the region and language. The result
+% is stored in \cs{TrackLangEnv} if it can be obtained. If
+% it can't be obtained, \cs{TrackLangEnv} is set to empty.
+% Also define \cs{TrackLangQueryOtherEnv}\marg{name} to query
+% \texttt{LC\_ALL}, \meta{name}, \texttt{LANG}.
+% For example
+%\begin{verbatim}
+%\TrackLangQueryOtherEnv{LC\_MONETARY}
+%\end{verbatim}
+%Note that there's not much that can be done from within \TeX\
+%for the C or POSIX locale or a locale starting with a slash, so
+%provide a check for them.
+%\begin{macro}{\@tracklang@checklocale}
+%    \begin{macrocode}
+\def\@tracklang@checklocale{%
+  \ifx\TrackLangEnv\empty
+  \else
+    \ifx\TrackLangEnv\@tracklang@locale@posix
+      \def\TrackLangEnv{}%
+    \else
+      \ifx\TrackLangEnv\@tracklang@locale@c
+        \def\TrackLangEnv{}%
+      \else
+        \expandafter\@@tracklang@checklocale
+           \TrackLangEnv\empty\relax
+      \fi
+    \fi
+  \fi
+}
+%    \end{macrocode}
+%\end{macro}
+%\begin{macro}{\@@tracklang@checklocale}
+%\changes{1.3}{2016-10-07}{new}
+%Check for leading slash.
+%    \begin{macrocode}
+\def\@@tracklang@checklocale#1#2\relax{%
+  \ifx#1/\relax
+    \def\TrackLangEnv{}%
+  \fi
+}
+%    \end{macrocode}
+%\end{macro}
+%\begin{macro}{\@tracklang@locale@posix}
+%\changes{1.3}{2016-10-07}{new}
+%    \begin{macrocode}
+\def\@tracklang@locale@posix{POSIX}
+%    \end{macrocode}
+%\end{macro}
+%\begin{macro}{\@tracklang@locale@c}
+%\changes{1.3}{2016-10-07}{new}
+%    \begin{macrocode}
+\def\@tracklang@locale@c{C}
+%    \end{macrocode}
+%\end{macro}
+%    \begin{macrocode}
+\ifx\directlua\undefined
+%    \end{macrocode}
+%We can't use Lua, so we'll have to use the shell escape if it's
+%enabled. First determine if the shell escape is available.
+%\begin{macro}{\@tracklang@tryshellescape}
+%No shell escape.
+%    \begin{macrocode}
+  \def\@tracklang@tryshellescape#1{%
+   \def\TrackLangQueryEnv{%
+     \@tracklang@warn{\string\TrackLangQueryEnv\space
+     non-operational as shell escape has been disabled}%
+     \def\TrackLangEnv{}%
+   }%
+   \def\TrackLangQueryOtherEnv##1{%
+     \@tracklang@warn{\string\TrackLangQueryOtherEnv{##1}\space
+     non-operational as shell escape has been disabled}%
+     \def\TrackLangEnv{}%
+   }%
+  }%
+%    \end{macrocode}
+%\changes{1.3.2}{2016-10-11}{added check if \cs{shellescape} has
+%been set to \cs{relax}}
+%    \begin{macrocode}
+   \ifx\pdfshellescape\undefined
+     \ifx\shellescape\undefined
+%    \end{macrocode}
+% Can't determine if the shell escape has been enabled.
+%    \begin{macrocode}
+        \def\@tracklang@tryshellescape#1{%
+          \def\TrackLangQueryEnv{%
+            \@tracklang@warn{\string\TrackLangQueryEnv\space
+            non-operational as can't determine if the 
+            shell escape has been enabled. (Consider using
+            eTeX or pdfTeX.)}%
+            \def\TrackLangEnv{}%
+          }%
+          \def\TrackLangQueryOtherEnv##1{%
+            \@tracklang@warn{\string\TrackLangQueryOtherEnv{##1}\space
+            non-operational as can't determine if the 
+            shell escape has been enabled. (Consider using
+            eTeX or pdfTeX.)}%
+            \def\TrackLangEnv{}%
+          }%
+        }%
+     \else
+%    \end{macrocode}
+%\cs{shellescape} is defined. Check no one's been messing around
+%with it and set it to \cs{relax}.
+%    \begin{macrocode}
+       \ifx\shellescape\relax
+       \else
+         \ifnum\shellescape=0\relax
+         \else
+           \def\@tracklang@tryshellescape#1{#1}%
+         \fi
+       \fi
+     \fi
+   \else
+%    \end{macrocode}
+%\cs{pdfshellescape} is defined. Check no one's been messing around
+%with it and set it to \cs{relax}. (Default no-op already set.)
+%    \begin{macrocode}
+     \ifx\pdfshellescape\relax
+%    \end{macrocode}
+%\cs{pdfshellescape} has been set to \cs{relax}. Is it possible that
+%\cs{shellescape} is available?
+%    \begin{macrocode}
+       \ifx\shellescape\undefined
+       \else
+         \ifx\shellescape\relax
+         \else
+%    \end{macrocode}
+%\cs{shellescape} is available.
+%    \begin{macrocode}
+           \ifnum\shellescape=0\relax
+           \else
+             \def\@tracklang@tryshellescape#1{#1}%
+           \fi
+         \fi
+       \fi
+     \else
+       \ifnum\pdfshellescape=0\relax
+       \else
+         \def\@tracklang@tryshellescape#1{#1}%
+       \fi
+     \fi
+   \fi
+%    \end{macrocode}
+%\end{macro}
+% Try the shell escape:
+%    \begin{macrocode}
+   \@tracklang@tryshellescape
+   {%
+%    \end{macrocode}
+%\begin{macro}{\TrackLangQueryEnv}
+%\changes{1.3}{2016-10-07}{new}
+%    \begin{macrocode}
+     \def\TrackLangQueryEnv{%
+       \begingroup\endlinechar=-1\relax
+       \everyeof{\noexpand}%
+       \edef\x{\endgroup\def\noexpand\TrackLangEnv{%
+         \@tracklang@input|"kpsewhich --var-value LC_ALL" }}\x
+       \@tracklang@checklocale
+       \ifx\TrackLangEnv\empty
+         \begingroup\endlinechar=-1\relax
+         \everyeof{\noexpand}%
+         \edef\x{\endgroup\def\noexpand\TrackLangEnv{%
+           \@tracklang@input|"kpsewhich --var-value LANG" }}\x
+%    \end{macrocode}
+%Not sure if a path is likely to occur with \app{kpsewhich}
+%but check for it just in case.
+%    \begin{macrocode}
+         \@tracklang@checklocale
+         \ifx\TrackLangEnv\empty
+%    \end{macrocode}
+% Try texosquery if available.
+%    \begin{macrocode}
+           \ifx\TeXOSQueryLocale\undefined
+             \@tracklang@warn{Locale environment variables
+              unavailable (tried LC\string_ALL and LANG)}%
+           \else
+             \@tracklang@info{Using texosquery to find locale}%
+             \TeXOSQueryLocale\TrackLangEnv
+             \ifx\TrackLangEnv\empty
+               \@tracklang@warn{Locale can't be found 
+               (tried querying LC\string_ALL and LANG variables and
+               tried using texosquery)}%
+             \fi
+           \fi
+         \fi
+       \fi
+     }%
+%    \end{macrocode}
+%\end{macro}
+%\begin{macro}{\TrackLangQueryOtherEnv}
+%\changes{1.3}{2016-10-07}{new}
+%    \begin{macrocode}
+     \def\TrackLangQueryOtherEnv#1{%
+       \begingroup\endlinechar=-1\relax
+       \everyeof{\noexpand}%
+       \edef\x{\endgroup\def\noexpand\TrackLangEnv{%
+         \@tracklang@input|"kpsewhich --var-value LC_ALL" }}\x
+       \@tracklang@checklocale
+       \ifx\TrackLangEnv\empty
+         \begingroup\endlinechar=-1\relax
+         \everyeof{\noexpand}%
+         \edef\x{\endgroup\def\noexpand\TrackLangEnv{%
+           \@tracklang@input|"kpsewhich --var-value #1" }}\x
+         \@tracklang@checklocale
+         \ifx\TrackLangEnv\empty
+           \begingroup\endlinechar=-1\relax
+           \everyeof{\noexpand}%
+           \edef\x{\endgroup\def\noexpand\TrackLangEnv{%
+             \@tracklang@input|"kpsewhich --var-value LANG"}}\x
+           \@tracklang@checklocale
+           \ifx\TrackLangEnv\empty
+%    \end{macrocode}
+% Try texosquery if available.
+%    \begin{macrocode}
+             \ifx\TeXOSQueryLocale\undefined
+             \@tracklang@warn{Locale environment variables unavailable
+              (tried LC\string_ALL, #1 and LANG)}%
+             \else
+               \@tracklang@info{Using texosquery to find locale}%
+               \TeXOSQueryLocale\TrackLangEnv
+               \ifx\TrackLangEnv\empty
+                 \@tracklang@warn{Locale can't be found 
+                 (tried querying LC\string_ALL, #1 and LANG variables and
+                 tried using texosquery)}%
+               \fi
+             \fi
+           \fi
+         \fi
+       \fi
+     }%
+%    \end{macrocode}
+%\end{macro}
+%    \begin{macrocode}
+  }%
+\else
+%    \end{macrocode}
+%\cs{directlua} is defined, so we can query it through Lua:
+%\begin{macro}{\TrackLangQueryEnv}
+%\changes{1.3}{2016-10-07}{new}
+%    \begin{macrocode}
+   \def\TrackLangQueryEnv{%
+     \edef\TrackLangEnv{\directlua{
+       l = os.getenv("LC_ALL")
+       if l == nil or l == "" or l == "C" or l == "POSIX"
+                   or string.find(l, "^/") then
+         l = os.getenv("LANG")
+         if l == nil or l == "" or l == "C" or l == "POSIX"
+                     or string.find(l, "^/") then
+           l=os.setlocale(nil)
+           if l == nil or l == "C" or l == "POSIX"
+                       or string.find(l, "^/") then
+             l = ""
+           end
+         end
+       end
+       tex.print(l)}}%
+       \ifx\TrackLangEnv\empty
+%    \end{macrocode}
+% Try texosquery if available.
+%    \begin{macrocode}
+         \ifx\TeXOSQueryLocale\undefined
+         \@tracklang@warn{Locale can't be found through Lua
+          (tried querying LC\string_ALL and LANG variables and
+           os.setlocale(nil))}%
+         \else
+           \TeXOSQueryLocale\TrackLangEnv
+           \ifx\TrackLangEnv\empty
+             \@tracklang@warn{Locale can't be found through Lua
+             (tried querying LC\string_ALL and LANG variables and
+             os.setlocale(nil) and tried using texosquery)}%
+           \fi
+         \fi
+       \fi
+   }
+%    \end{macrocode}
+%\end{macro}
+%\begin{macro}{\TrackLangQueryOtherEnv}
+%\changes{1.3}{2016-10-07}{new}
+%    \begin{macrocode}
+   \def\TrackLangQueryOtherEnv#1{%
+     \edef\TrackLangEnv{\directlua{
+       l = os.getenv("LC_ALL")
+       if l == nil or l == "" or l == "C" or l == "POSIX"
+                   or string.find(l, "^/") then
+         l = os.getenv("#1")
+         if l == nil or l == "" or l == "C" or l == "POSIX"
+                     or string.find(l, "^/") then
+           l = os.getenv("LANG")
+           if l == nil or l == "" or l == "C" or l == "POSIX"
+                       or string.find(l, "^/") then
+             l=os.setlocale(nil)
+             if l == nil or l == "C" or l == "POSIX"
+                         or string.find(l, "^/") then
+               l = ""
+             end
+           end
+         end
+       end
+       tex.print(l}}%
+       \ifx\TrackLangEnv\empty
+%    \end{macrocode}
+% Try texosquery if available.
+%    \begin{macrocode}
+         \ifx\TeXOSQueryLocale\undefined
+         \@tracklang@warn{Locale can't be found through Lua
+          (tried querying LC\string_ALL, #1 and LANG variables and
+           os.setlocale(nil))}%
+         \else
+           \TeXOSQueryLocale\TrackLangEnv
+           \ifx\TrackLangEnv\empty
+             \@tracklang@warn{Locale can't be found through Lua
+             (tried querying LC\string_ALL, #1 and LANG variables and
+             os.setlocale(nil) and tried using texosquery)}%
+           \fi
+         \fi
+       \fi
+   }
+%    \end{macrocode}
+%\end{macro}
+%    \begin{macrocode}
+\fi
+%    \end{macrocode}
+%
+% Allowed formats for the localisation environment variables are 
+%\begin{definition}
+%\meta{iso-lang}[\_\meta{iso-territory}][\texttt{.}\meta{encoding}][@\meta{modifier}]
+%\end{definition}
+%(where the square brackets above indicate an optional component not that
+%there are literal square brackets.) This is a bit fiddly, so it
+%needs to be broken up into manageable chunks.
+%
+%\begin{macro}{\TrackLangParseFromEnv}
+%\changes{1.3}{2016-10-07}{new}
+%Parse \cs{TrackLangEnv}, if it has been
+%set, and set \cs{TrackLangEnvLang}, \cs{TrackLangEnvTerritory}
+% and \cs{TrackLangEnvCodeSet}. If the information is unavailable, 
+% the relevant commands will be set to empty. Use
+% \cs{TrackLangFromEnv} to query, parse and set.
+%    \begin{macrocode}
+\def\TrackLangParseFromEnv{%
+  \ifx\TrackLangEnv\undefined
+     \@tracklang@warn{\string\TrackLangParseFromEnv\space
+     non-operational as \string\TrackLangEnv\space hasn't been
+     defined}%
+     \def\TrackLangEnvLang{}%
+     \def\TrackLangEnvTerritory{}%
+     \def\TrackLangEnvCodeSet{}%
+     \def\TrackLangEnvModifier{}%
+  \else
+    \ifx\TrackLangEnv\empty
+      \@tracklang@warn{\string\TrackLangParseFromEnv\space
+      non-operational as \string\TrackLangEnv\space is empty}%
+      \def\TrackLangEnvLang{}%
+      \def\TrackLangEnvTerritory{}%
+      \def\TrackLangEnvCodeSet{}%
+      \def\TrackLangEnvModifier{}%
+    \else
+      \@tracklang@parse@locale{\TrackLangEnv}%
+      \let\TrackLangEnvLang\@TrackLangEnvLang
+      \let\TrackLangEnvTerritory\@TrackLangEnvTerritory
+      \let\TrackLangEnvCodeSet\@TrackLangEnvCodeSet
+      \let\TrackLangEnvModifier\@TrackLangEnvModifier
+    \fi
+  \fi
+}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@parse@locale}
+%\changes{1.3}{2016-10-07}{new}
+%Parse localisation format.
+%    \begin{macrocode}
+\def\@tracklang@parse@locale#1{%
+%    \end{macrocode}
+%Initialise.
+%    \begin{macrocode}
+  \def\@TrackLangEnvLang{}%
+  \def\@TrackLangEnvSubLang{}%
+  \def\@TrackLangEnvFirstSubLang{}%
+  \def\@TrackLangEnvTerritory{}%
+  \def\@TrackLangEnvCodeSet{}%
+  \def\@TrackLangEnvVariant{}%
+  \def\@TrackLangEnvModifier{}%
+  \def\@TrackLangEnvScript{}%
+  \def\@TrackLangEnvAdditional{}%
+%    \end{macrocode}
+%Just in case argument is empty or \cs{relax}.
+%    \begin{macrocode}
+  \expandafter\ifx\expandafter\relax#1\relax
+  \else
+%    \end{macrocode}
+% Parse codeset and modifier first.
+%    \begin{macrocode}
+    \expandafter\@tracklang@parseenv
+      #1..\relax\@tracklang@end@parseenv\@tracklang@result
+%    \end{macrocode}
+% Parse language and territory.
+%    \begin{macrocode}
+    \ifx\@tracklang@result\empty
+    \else
+      \expandafter\@tracklang@split@underscoreorhyp\expandafter
+       {\@tracklang@result}%
+      \let\@TrackLangEnvLang\@tracklang@split@pre
+      \let\@TrackLangEnvTerritory\@tracklang@split@post
+    \fi
+  \fi
+}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@split@underscoreorhyp}
+%\changes{1.3}{2016-10-07}{new}
+%Split on either an underscore or a hyphen and store the results in
+%\cs{@tracklang@split@pre} and \cs{@tracklang@split@post}
+%    \begin{macrocode}
+\def\@tracklang@split@underscoreorhyp#1{%
+%    \end{macrocode}
+%First try to split on an underscore.
+%    \begin{macrocode}
+  \@tracklang@split@underscore{#1}%
+%    \end{macrocode}
+%If the post part was empty, try to split on hyphen instead.
+%    \begin{macrocode}
+  \ifx\@tracklang@split@post\empty
+    \@tracklang@split@hyphen{#1}%
+%    \end{macrocode}
+%If the post part was empty, maybe the underscore has had its
+%category code changed to 12.
+%    \begin{macrocode}
+    \ifx\@tracklang@split@post\empty
+      \@tracklang@split@otherunderscore{#1}%
+    \fi
+  \fi
+}
+%    \end{macrocode}
+%\end{macro}
+%\begin{macro}{\@tracklang@split@underscore}
+%\changes{1.3}{2016-10-07}{new}
+%Split on an underscore and store the results in
+%\cs{@tracklang@split@pre} and \cs{@tracklang@split@post}. First
+%make sure that the underscore has its normal subscript category code.
+%    \begin{macrocode}
+{
+  \catcode`\_8\relax
+  \gdef\@tracklang@split@underscore#1{%
+    \@@tracklang@split@underscore#1__\relax\@tracklang@end@split@underscore
+  }
+  \gdef\@@tracklang@split@underscore#1_#2_#3\@tracklang@end@split@underscore{%
+    \def\@tracklang@split@pre{#1}%
+    \ifx\relax#3\relax
+      \def\@tracklang@split@post{#2}%
+    \else
+      \@tracklang@split@underscore@remainder#2_#3%
+    \fi
+  }
+  \gdef\@tracklang@split@underscore@remainder#1__\relax{%
+    \def\@tracklang@split@post{#1}%
+  }
+}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@split@otherunderscore}
+%\changes{1.3}{2016-10-07}{new}
+%As above but where underscore has catcode 12.
+%    \begin{macrocode}
+{
+  \catcode`\_12\relax
+  \gdef\@tracklang@split@otherunderscore#1{%
+    \@@tracklang@split@otherunderscore#1__\relax\@tracklang@end@split@underscore
+  }
+  \gdef\@@tracklang@split@otherunderscore#1_#2_#3\@tracklang@end@split@underscore{%
+    \def\@tracklang@split@pre{#1}%
+    \ifx\relax#3\relax
+      \def\@tracklang@split@post{#2}%
+    \else
+      \@tracklang@split@otherunderscore@remainder#2_#3%
+    \fi
+  }
+  \gdef\@tracklang@split@otherunderscore@remainder#1__\relax{%
+    \def\@tracklang@split@post{#1}%
+  }
+}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@split@hyphen}
+%\changes{1.3}{2016-10-07}{new}
+%Split on a hyphen and store the results in
+%\cs{@tracklang@split@pre} and \cs{@tracklang@split@post}
+%    \begin{macrocode}
+{
+  \catcode`\-12\relax
+  \gdef\@tracklang@split@hyphen#1{%
+    \@@tracklang@split@hyphen#1--\relax\@tracklang@end@split@hyphen
+  }
+  \gdef\@@tracklang@split@hyphen#1-#2-#3\@tracklang@end@split@hyphen{%
+    \def\@tracklang@split@pre{#1}%
+    \ifx\relax#3\relax
+      \def\@tracklang@split@post{#2}%
+    \else
+      \@tracklang@split@hyphen@remainder#2-#3%
+    \fi
+  }
+  \gdef\@tracklang@split@hyphen@remainder#1--\relax{%
+    \def\@tracklang@split@post{#1}%
+  }
+}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@parseenv}
+%\changes{1.3}{2016-10-07}{new}
+%Parse for the codeset. The first argument will be the
+%language and (optionally) the territory. So the final argument is the control
+%sequence to use to store the first argument, which can then be
+%split.
+%    \begin{macrocode}
+\gdef\@tracklang@parseenv#1.#2.#3\@tracklang@end@parseenv#4{%
+  \def\@TrackLangEnvCodeSet{#2}%
+  \def#4{#1}%
+  \ifx\@TrackLangEnvCodeSet\empty
+    \tracklangparsemod#4%
+  \else
+    \tracklangparsemod\@TrackLangEnvCodeSet
+  \fi
+}
+%    \end{macrocode}
+%\end{macro}
+%\begin{macro}{\tracklangparsemod}
+% Extract the modifier from the code set.
+% The \texttt{@} is rather awkward as we need to change its category
+% code as it's likely to be set to 12 within \cs{TrackLangEnv}.
+% So change the category code of \texttt{@} to 12, but this means we
+% can't use it in the command name, so although these are private
+% internal commands they don't look like internal commands.)
+%    \begin{macrocode}
+{\catcode`\@=12\relax
+  \gdef\tracklangparsemod#1{
+    \expandafter\tracklangparseenvatmod#1@@\relax\tracklangendparseenvatmod
+    \let#1\tracklangtmp
+  }%
+  \gdef\tracklangparseenvatmod#1@#2@#3\tracklangendparseenvatmod{%
+    \def\tracklangtmp{#1}%
+%    \end{macrocode}
+%Need to use \cs{csname} here as can't use internal commands.
+%    \begin{macrocode}
+    \expandafter\def\csname @TrackLangEnvModifier\endcsname{#2}%
+%    \end{macrocode}
+%Sanitize in case it contains any special characters.
+%    \begin{macrocode}
+    \csname @tracklang@sanitize\expandafter\endcsname
+      \csname @TrackLangEnvModifier\endcsname
+  }
+}
+%    \end{macrocode}
+%\end{macro}
+%
+%\subsection{Internal Lists}
+%
+%\begin{macro}{\@tracklang@languages}
+% Provide a list to keep track of all the languages.
+%    \begin{macrocode}
+\def\@tracklang@languages{}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@dialects}
+% Provide a list to keep track of all the dialects. Here the
+% \qt{dialect} isn't necessarily an actual dialect but may be a
+% root language or a synonym. It will usually correspond to the
+% language name as specified by the user in the package option.
+%    \begin{macrocode}
+\def\@tracklang@dialects{}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@ifinlist}
+%\begin{definition}
+%\cs{@tracklang@ifinlist}\marg{item}\marg{list}\marg{true
+%part}\marg{false part}
+%\end{definition}
+%Checks if \meta{item} is in \meta{list}. (Performs a one-level
+%expansion on \meta{list} but no expansion on \meta{item}.)
+%    \begin{macrocode}
+\def\@tracklang@ifinlist#1#2#3#4{%
+  \def\@tracklang@doifinlist##1,#1,##2\end@tracklang@doifinlist{%
+     \def\@before{##1}%
+     \def\@after{##2}%
+  }%
+  \expandafter\@tracklang@doifinlist\expandafter,#2,#1,\@nil
+    \end@tracklang@doifinlist
+  \ifx\@after\@tracklang@nnil
+%    \end{macrocode}
+% not found
+%    \begin{macrocode}
+    #4%
+  \else
+%    \end{macrocode}
+% found
+%    \begin{macrocode}
+    #3%
+  \fi
+}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@add}
+%\begin{definition}
+%\cs{@tracklang@add}\marg{item}\marg{list cs}
+%\end{definition}
+% Adds an item to the list given by \meta{list cs}. Does nothing if
+% \meta{item} is empty or is already in the list. The \meta{item} is
+% fully expanded before being added.
+%    \begin{macrocode}
+\def\@tracklang@add#1#2{%
+%    \end{macrocode}
+% First find out if the item is empty.
+%    \begin{macrocode}
+  \edef\@tracklang@element{#1}%
+  \ifx\@tracklang@element\empty
+%    \end{macrocode}
+% Item is empty, so do nothing.
+%    \begin{macrocode}
+  \else
+    \expandafter\@tracklang@ifinlist\expandafter{\@tracklang@element}#2%
+    {%
+%    \end{macrocode}
+% Already in list, so do nothing.
+%    \begin{macrocode}
+    }%
+    {%
+%    \end{macrocode}
+% Not in list, so add.
+%    \begin{macrocode}
+     \ifx\empty#2\relax
+       \let#2\@tracklang@element
+     \else
+       \edef#2{#2,\@tracklang@element}%
+     \fi
+    }%
+  \fi
+}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\AddTrackedDialect}
+%\begin{definition}
+%\cs{AddTrackedDialect}\marg{dialect name}\marg{language name}
+%\end{definition}
+% Add a dialect. (v1.3 switched from unexpanded to expanded def.
+% All labels should be expandable.)
+%    \begin{macrocode}
+\def\AddTrackedDialect#1#2{%
+ \@tracklang@add{#1}{\@tracklang@dialects}%
+ \@tracklang@add{#2}{\@tracklang@languages}%
+ \@tracklang@enamedef{@tracklang@fromdialect@#1}{#2}%
+ \@tracklang@ifundef{@tracklang@todialect@#2}%
+ {\@tracklang@enamedef{@tracklang@todialect@#2}{#1}}%
+ {%
+   \def\@tracklang@lang{#1}%
+   \expandafter\@tracklang@add\expandafter\@tracklang@lang
+     \csname @tracklang@todialect@#2\endcsname
+ }%
+%    \end{macrocode}
+% Provide a convenient way of referencing the last dialect to be
+% tracked.
+%    \begin{macrocode}
+ \edef\TrackLangLastTrackedDialect{#1}%
+}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\AddTrackedLanguage}
+%\begin{definition}
+%\cs{AddTrackedLanguage}\marg{language name}
+%\end{definition}
+% Add a dialect.
+%    \begin{macrocode}
+\def\AddTrackedLanguage#1{%
+  \AddTrackedDialect{#1}{#1}%
+}
+%    \end{macrocode}
+%\end{macro}
+%
+%\subsection{Known Languages}
+%\label{sec:code:knownlangs}
+%
+%\begin{macro}{\@tracklang@known@langs}
+%\changes{1.3}{2016-10-07}{new}
+%List of known (root) languages (that may or may not be tracked).
+%    \begin{macrocode}
+\def\@tracklang@known@langs{}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\TrackLangNewLanguage}
+%\changes{1.3}{2016-10-07}{new}
+%\begin{definition}
+%\cs{TrackLangNewLanguage}\marg{language name}\marg{639-1
+%code}\marg{639-2 (T)}\marg{639-2 (B)}\marg{639-3}\marg{3166-1}\marg{default
+%script}
+%\end{definition}
+%Identifies a new language that may be tracked. The code
+%arguments may be empty if not available.
+%(v1.3 switched from unexpanded to expanded def.
+%All labels should be expandable.) Most
+%root languages don't have an associated country code as they're
+%spoken in multiple regions. The \meta{default script} is the
+%default script identified with the ISO 15924 alpha script code.
+%To reduce overheads, only define 639-3 if there's no 639-1 or 639-2
+%code.
+%    \begin{macrocode}
+\def\TrackLangNewLanguage#1#2#3#4#5#6#7{%
+ \@tracklang@add{#1}{\@tracklang@known@langs}%
+ \edef\@tracklang@tmp{#2}%
+ \ifx\@tracklang@tmp\empty
+ \else
+   \@tracklang@enamedef{@tracklang@knownisolang@#2}{#1}%
+   \@tracklang@enamedef{@tracklang@knowniso@639@1@#1}{#2}%
+ \fi
+ \edef\@tracklang@tmp{#3}%
+ \ifx\@tracklang@tmp\empty
+ \else
+   \@tracklang@enamedef{@tracklang@knownisolang@#3}{#1}%
+   \@tracklang@enamedef{@tracklang@knowniso@639@2@#1}{#3}%
+ \fi
+ \edef\@tracklang@tmp{#4}%
+ \ifx\@tracklang@tmp\empty
+ \else
+   \@tracklang@enamedef{@tracklang@knowniso@639@2B@#1}{#4}%
+ \fi
+ \edef\@tracklang@tmp{#5}%
+ \ifx\@tracklang@tmp\empty
+ \else
+   \@tracklang@enamedef{@tracklang@knownisolang@#5}{#1}%
+   \@tracklang@enamedef{@tracklang@knowniso@639@3@#1}{#5}%
+ \fi
+ \edef\@tracklang@tmp{#6}%
+ \ifx\@tracklang@tmp\empty
+ \else
+   \@tracklang@enamedef{@tracklang@knowniso@3166@#1}{#6}%
+ \fi
+ \edef\@tracklang@tmp{#7}%
+ \ifx\@tracklang@tmp\empty
+ \else
+   \@tracklang@enamedef{@tracklang@knowniso@script@#1}{#7}%
+ \fi
+}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\TrackLangIfKnownLang}
+%\changes{1.3}{2016-10-07}{new}
+%\begin{definition}
+%\cs{TrackLangIfKnownLang}\marg{language}\marg{true}\marg{false}
+%\end{definition}
+%Tests if \meta{language} is known (but not necessarily tracked).
+%    \begin{macrocode}
+\def\TrackLangIfKnownLang#1#2#3{%
+  \expandafter\@tracklang@ifinlist\expandafter{#1}{\@tracklang@known@langs}%
+  {#2}%
+  {#3}%
+}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\TrackLangIfKnownIsoTwoLetterLang}
+%\changes{1.3}{2016-10-07}{new}
+%\begin{definition}
+%\cs{TrackLangIfKnownIsoTwoLetterLang}\marg{language}\marg{true}\marg{false}
+%\end{definition}
+%Checks if the given language has an ISO 639-1 language code 
+%(but is not necessarily tracked).
+%    \begin{macrocode}
+\def\TrackLangIfKnownIsoTwoLetterLang#1#2#3{%
+  \@tracklang@ifundef{@tracklang@knowniso@639@1@#1}%
+  {#3}%
+  {#2}%
+}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\TrackLangGetKnownIsoTwoLetterLang}
+%\changes{1.3}{2016-10-07}{new}
+%\begin{definition}
+%\cs{TrackLangGetKnownIsoTwoLetterLang}\marg{language}
+%\end{definition}
+%Gets the ISO 639-1 language code for the given language.
+%    \begin{macrocode}
+\def\TrackLangGetKnownIsoTwoLetterLang#1{%
+  \@tracklang@nameuse{@tracklang@knowniso@639@1@#1}%
+}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\TrackLangIfKnownIsoThreeLetterLang}
+%\changes{1.3}{2016-10-07}{new}
+%\begin{definition}
+%\cs{TrackLangIfKnownIsoThreeLetterLang}\marg{language}\marg{true}\marg{false}
+%\end{definition}
+%Checks if the given language has an ISO 639-2 language code 
+%(but is not necessarily tracked).
+%    \begin{macrocode}
+\def\TrackLangIfKnownIsoThreeLetterLang#1#2#3{%
+  \@tracklang@ifundef{@tracklang@knowniso@639@2@#1}%
+  {#3}%
+  {#2}%
+}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\TrackLangGetKnownIsoThreeLetterLang}
+%\changes{1.3}{2016-10-07}{new}
+%\begin{definition}
+%\cs{TrackLangGetKnownIsoThreeLetterLang}\marg{language}
+%\end{definition}
+%Gets the ISO 639-2 language code.
+%    \begin{macrocode}
+\def\TrackLangGetKnownIsoThreeLetterLang#1{%
+  \@tracklang@nameuse{@tracklang@knowniso@639@2@#1}%
+}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\TrackLangIfKnownIsoThreeLetterLangB}
+%\changes{1.3}{2016-10-07}{new}
+%\begin{definition}
+%\cs{TrackLangIfKnownIsoThreeLetterLangB}\marg{language}\marg{true}\marg{false}
+%\end{definition}
+%Checks if the given language has an ISO 639-2 (B) language code 
+%(but is not necessarily tracked).
+%    \begin{macrocode}
+\def\TrackLangIfKnownIsoThreeLetterLangB#1#2#3{%
+  \@tracklang@ifundef{@tracklang@knowniso@639@2B@#1}%
+  {#3}%
+  {#2}%
+}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\TrackLangGetKnownIsoThreeLetterLangB}
+%\changes{1.3}{2016-10-07}{new}
+%\begin{definition}
+%\cs{TrackLangGetKnownIsoThreeLetterLangB}\marg{language}
+%\end{definition}
+%Gets the ISO 639-2 (B) language code.
+%    \begin{macrocode}
+\def\TrackLangGetKnownIsoThreeLetterLangB#1{%
+  \@tracklang@nameuse{@tracklang@knowniso@639@2B@#1}%
+}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\TrackLangIfKnownLangFromIso}
+%\changes{1.3}{2016-10-07}{new}
+%\begin{definition}
+%\cs{TrackLangIfKnownLangFromIso}\marg{ISO code}\marg{true}\marg{false}
+%\end{definition}
+%Checks if the given ISO language code (639-1 or 639-2 or 639-3) is
+%recognised (but not necessarily tracked).
+%    \begin{macrocode}
+\def\TrackLangIfKnownLangFromIso#1#2#3{%
+  \@tracklang@ifundef{@tracklang@knownisolang@#1}%
+  {#3}%
+  {#2}%
+}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\TrackLangGetKnownLangFromIso}
+%\changes{1.3}{2016-10-07}{new}
+%\begin{definition}
+%\cs{TrackLangGetKnownLangFromIso}\marg{ISO code}
+%\end{definition}
+%Gets the root language label from the given ISO code (639-1 or
+%639-2).
+%    \begin{macrocode}
+\def\TrackLangGetKnownLangFromIso#1{%
+  \@tracklang@nameuse{@tracklang@knownisolang@#1}%
+}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\TrackLangIfHasKnownCountry}
+%\changes{1.3}{2016-10-07}{new}
+%\begin{definition}
+%\cs{TrackLangIfHasKnownCountry}\marg{language}\marg{true}\marg{false}
+%\end{definition}
+%Checks if the given language has an ISO 3166-1 country code 
+%(but is not necessarily tracked).
+%    \begin{macrocode}
+\def\TrackLangIfHasKnownCountry#1#2#3{%
+  \@tracklang@ifundef{@tracklang@knowniso@3166@#1}%
+  {#3}%
+  {#2}%
+}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\TrackLangGetKnownCountry}
+%\changes{1.3}{2016-10-07}{new}
+%\begin{definition}
+%\cs{TrackLangGetKnownCountry}\marg{language}
+%\end{definition}
+%Fetches the ISO 3166-1 country code for the given language.
+%    \begin{macrocode}
+\def\TrackLangGetKnownCountry#1{%
+  \@tracklang@nameuse{@tracklang@knowniso@3166@#1}%
+}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\TrackLangGetDefaultScript}
+%\changes{1.3}{2016-10-07}{new}
+%\begin{definition}
+%\cs{TrackLangGetDefaultScript}\marg{language}
+%\end{definition}
+% Gets the default script for the given root language label.
+%    \begin{macrocode}
+\def\TrackLangGetDefaultScript#1{%
+  \@tracklang@nameuse{@tracklang@knowniso@script@#1}%
+}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\TrackLangIfHasDefaultScript}
+%\changes{1.3}{2016-10-07}{new}
+%\begin{definition}
+%\cs{TrackLangIfHasDefaultScript}\marg{language}\marg{true}\marg{false}
+%\end{definition}
+%If there's a default script for \meta{language}, do \meta{true} otherwise
+%do \meta{false}.
+%    \begin{macrocode}
+\def\TrackLangIfHasDefaultScript#1#2#3{%
+  \@tracklang@ifundef{@tracklang@knowniso@script@#1}{#3}{#2}%
+}
+%    \end{macrocode}
+%\end{macro}
+%
+%\subsection{Mappings}
+%\label{sec:code:mappings}
+%
+%\begin{macro}{\AddTrackedIsoLanguage}
+%\begin{definition}
+%\cs{AddTrackedIsoLanguage}\marg{code type}\marg{code}\marg{language}
+%\end{definition}
+% Adds a~mapping between the given ISO code and language
+% name. There may be multiple mappings from an ISO code to a
+% language name, but only one mapping from a language name to an ISO
+% code. (v1.3 switched from unexpanded to expanded def.
+% All labels should be expandable.)
+%    \begin{macrocode}
+\def\AddTrackedIsoLanguage#1#2#3{%
+  \@tracklang@enamedef{@tracklang@#1@isofromlang@#3}{#2}%
+  \@tracklang@ifundef{@tracklang@#1@isotolang@#2}%
+  {\@tracklang@enamedef{@tracklang@#1@isotolang@#2}{#3}}%
+  {%
+    \def\@tracklang@lang{#3}%
+    \expandafter\@tracklang@add\expandafter\@tracklang@lang
+      \csname @tracklang@#1@isotolang@#2\endcsname
+  }%
+}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\TrackedLanguageFromIsoCode}
+%\begin{definition}
+%\cs{TrackedLanguageFromIsoCode}\marg{code type}\marg{code}
+%\end{definition}
+% Fetches the language label (or labels) associated with the given code.
+%    \begin{macrocode}
+\def\TrackedLanguageFromIsoCode#1#2{%
+  \@tracklang@nameuse{@tracklang@#1@isotolang@#2}%
+}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\TrackedIsoCodeFromLanguage}
+%\begin{definition}
+%\cs{TrackedIsoCodeFromLanguage}\marg{code type}\marg{language}
+%\end{definition}
+% Fetches the code associated with the given language or dialect.
+%    \begin{macrocode}
+\def\TrackedIsoCodeFromLanguage#1#2{%
+  \@tracklang@nameuse{@tracklang@#1@isofromlang@#2}%
+}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\TrackedLanguageFromDialect}
+%\begin{definition}
+%\cs{TrackedLanguageFromDialect}\marg{dialect}
+%\end{definition}
+% Fetches the language name from the given dialect.
+%    \begin{macrocode}
+\def\TrackedLanguageFromDialect#1{%
+ \@tracklang@nameuse{@tracklang@fromdialect@#1}%
+}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\TrackedDialectsFromLanguage}
+%\begin{definition}
+%\cs{TrackedDialectsFromLanguage}\marg{root language label}
+%\end{definition}
+% Fetches the tracked dialects whose language is given by \meta{root
+% language label}.
+%    \begin{macrocode}
+\def\TrackedDialectsFromLanguage#1{%
+ \@tracklang@nameuse{@tracklang@todialect@#1}%
+}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\TwoLetterIsoCountryCode}
+%    \begin{macrocode}
+\def\TwoLetterIsoCountryCode{3166-1}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\TwoLetterIsoLanguageCode}
+%    \begin{macrocode}
+\def\TwoLetterIsoLanguageCode{639-1}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\ThreeLetterIsoLanguageCode}
+%    \begin{macrocode}
+\def\ThreeLetterIsoLanguageCode{639-2}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\ThreeLetterExtIsoLanguageCode}
+%    \begin{macrocode}
+\def\ThreeLetterExtIsoLanguageCode{639-3}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\SetTrackedDialectModifier}
+%\changes{1.3}{2016-10-07}{new}
+%\begin{definition}
+%\cs{SetTrackedDialectModifier}\marg{dialect}\marg{value}
+%\end{definition}
+%Set the modifier for \meta{dialect}. (For example, old or new.)
+%Arguments are expanded.
+%    \begin{macrocode}
+\def\SetTrackedDialectModifier#1#2{%
+  \@tracklang@enamedef{@tracklang@modifier@#1}{#2}%
+}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\GetTrackedDialectModifier}
+%\changes{1.3}{2016-10-07}{new}
+%\begin{definition}
+%\cs{GetTrackedDialectModifier}\marg{dialect}
+%\end{definition}
+%Get the modifier for \meta{dialect}.
+%    \begin{macrocode}
+\def\GetTrackedDialectModifier#1{%
+  \@tracklang@nameuse{@tracklang@modifier@#1}%
+}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\IfHasTrackedDialectModifier}
+%\changes{1.3}{2016-10-07}{new}
+%\begin{definition}
+%\cs{IfHasTrackedDialectModifier}\marg{dialect}\marg{true}\marg{false}
+%\end{definition}
+%If there's a modifier for \meta{dialect}, do \meta{true} otherwise
+%do \meta{false}.
+%    \begin{macrocode}
+\def\IfHasTrackedDialectModifier#1#2#3{%
+  \@tracklang@ifundef{@tracklang@modifier@#1}{#3}{#2}%
+}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\SetTrackedDialectScript}
+%\changes{1.3}{2016-10-07}{new}
+%\begin{definition}
+%\cs{SetTrackedDialectScript}\marg{dialect}\marg{value}
+%\end{definition}
+%Set the script for \meta{dialect}. (For example, Latn or Cyrl.)
+%Arguments are expanded.
+%    \begin{macrocode}
+\def\SetTrackedDialectScript#1#2{%
+  \@tracklang@enamedef{@tracklang@script@#1}{#2}%
+}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\GetTrackedDialectScript}
+%\changes{1.3}{2016-10-07}{new}
+%\begin{definition}
+%\cs{GetTrackedDialectScript}\marg{dialect}
+%\end{definition}
+%Get the script for \meta{dialect}.
+%    \begin{macrocode}
+\def\GetTrackedDialectScript#1{%
+  \@tracklang@nameuse{@tracklang@script@#1}%
+}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\IfHasTrackedDialectScript}
+%\changes{1.3}{2016-10-07}{new}
+%\begin{definition}
+%\cs{IfHasTrackedDialectScript}\marg{dialect}\marg{true}\marg{false}
+%\end{definition}
+%If there's a script for \meta{dialect}, do \meta{true} otherwise
+%do \meta{false}.
+%    \begin{macrocode}
+\def\IfHasTrackedDialectScript#1#2#3{%
+  \@tracklang@ifundef{@tracklang@script@#1}{#3}{#2}%
+}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\IfTrackedDialectIsScriptCs}
+%\changes{1.3}{2016-10-07}{new}
+%\begin{definition}
+%\cs{IfTrackedDialectIsScriptCs}\marg{dialect}\marg{cs}\marg{true}\marg{false}
+%\end{definition}
+%If the given tracked dialect has an associated script and that
+%script code matches the replacement text for the control sequence
+%\meta{cs} then do \meta{true} otherwise to \meta{false}. If the
+%tracked dialect doesn't have an associated script then the default
+%script for the root language is tested. The use of
+%a control sequence allows \cs{ifx} for the test, which means that
+%this command can expand. The supplementary package
+%\sty{tracklang-script} provides control sequences for known ISO
+%15924 codes.
+%    \begin{macrocode}
+\def\IfTrackedDialectIsScriptCs#1#2#3#4{%
+  \IfHasTrackedDialectScript{#1}%
+  {%
+    \expandafter\ifx\expandafter#2\csname @tracklang@script@#1\endcsname
+      #3%
+    \else
+      #4%
+    \fi
+  }%
+  {%
+    \TrackLangIfHasDefaultScript{\TrackedLanguageFromDialect{#1}}%
+    {%
+      \expandafter\ifx\expandafter
+        #2\csname @tracklang@knowniso@script@\TrackedLanguageFromDialect{#1}\endcsname
+         #3%
+      \else
+         #4%
+      \fi
+    }%
+    {#4}%
+  }%
+}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\SetTrackedDialectVariant}
+%\changes{1.3}{2016-10-07}{new}
+%\begin{definition}
+%\cs{SetTrackedDialectVariant}\marg{dialect}\marg{value}
+%\end{definition}
+%Set the modifier for \meta{dialect}. (For example, old or new.)
+%Arguments are expanded.
+%    \begin{macrocode}
+\def\SetTrackedDialectVariant#1#2{%
+  \@tracklang@enamedef{@tracklang@variant@#1}{#2}%
+}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\GetTrackedDialectVariant}
+%\changes{1.3}{2016-10-07}{new}
+%\begin{definition}
+%\cs{GetTrackedDialectVariant}\marg{dialect}
+%\end{definition}
+%Get the modifier for \meta{dialect}.
+%    \begin{macrocode}
+\def\GetTrackedDialectVariant#1{%
+  \@tracklang@nameuse{@tracklang@variant@#1}%
+}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\IfHasTrackedDialectVariant}
+%\changes{1.3}{2016-10-07}{new}
+%\begin{definition}
+%\cs{IfHasTrackedDialectVariant}\marg{dialect}\marg{true}\marg{false}
+%\end{definition}
+%If there's a modifier for \meta{dialect}, do \meta{true} otherwise
+%do \meta{false}.
+%    \begin{macrocode}
+\def\IfHasTrackedDialectVariant#1#2#3{%
+  \@tracklang@ifundef{@tracklang@variant@#1}{#3}{#2}%
+}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\SetTrackedDialectSubLang}
+%\changes{1.3}{2016-10-07}{new}
+%\begin{definition}
+%\cs{SetTrackedDialectSubLang}\marg{dialect}\marg{value}
+%\end{definition}
+%Set the sublang for \meta{dialect}.
+%Arguments are expanded.
+%    \begin{macrocode}
+\def\SetTrackedDialectSubLang#1#2{%
+  \@tracklang@enamedef{@tracklang@sublang@#1}{#2}%
+}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\GetTrackedDialectSubLang}
+%\changes{1.3}{2016-10-07}{new}
+%\begin{definition}
+%\cs{GetTrackedDialectSubLang}\marg{dialect}
+%\end{definition}
+%Get the sublang for \meta{dialect}.
+%    \begin{macrocode}
+\def\GetTrackedDialectSubLang#1{%
+  \@tracklang@nameuse{@tracklang@sublang@#1}%
+}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\IfHasTrackedDialectSubLang}
+%\changes{1.3}{2016-10-07}{new}
+%\begin{definition}
+%\cs{IfHasTrackedDialectSubLang}\marg{dialect}\marg{true}\marg{false}
+%\end{definition}
+%If there's a sublang for \meta{dialect}, do \meta{true} otherwise
+%do \meta{false}.
+%    \begin{macrocode}
+\def\IfHasTrackedDialectSubLang#1#2#3{%
+  \@tracklang@ifundef{@tracklang@sublang@#1}{#3}{#2}%
+}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\SetTrackedDialectAdditional}
+%\changes{1.3}{2016-10-07}{new}
+%\begin{definition}
+%\cs{SetTrackedDialectAdditional}\marg{dialect}\marg{value}
+%\end{definition}
+%Set the extra for \meta{dialect}.
+%Arguments are expanded.
+%    \begin{macrocode}
+\def\SetTrackedDialectAdditional#1#2{%
+  \@tracklang@enamedef{@tracklang@extra@#1}{#2}%
+}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\GetTrackedDialectAdditional}
+%\changes{1.3}{2016-10-07}{new}
+%\begin{definition}
+%\cs{GetTrackedDialectAdditional}\marg{dialect}
+%\end{definition}
+%Get the extra for \meta{dialect}.
+%    \begin{macrocode}
+\def\GetTrackedDialectAdditional#1{%
+  \@tracklang@nameuse{@tracklang@extra@#1}%
+}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\IfHasTrackedDialectAdditional}
+%\changes{1.3}{2016-10-07}{new}
+%\begin{definition}
+%\cs{IfHasTrackedDialectAdditional}\marg{dialect}\marg{true}\marg{false}
+%\end{definition}
+%If there's extra info for \meta{dialect}, do \meta{true} otherwise
+%do \meta{false}.
+%    \begin{macrocode}
+\def\IfHasTrackedDialectAdditional#1#2#3{%
+  \@tracklang@ifundef{@tracklang@extra@#1}{#3}{#2}%
+}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\GetTrackedLanguageTag}
+%\changes{1.3}{2016-10-07}{new}
+%\begin{definition}
+%\cs{GetTrackedLanguageTag}\marg{dialect}
+%\end{definition}
+%Get the language tag for \meta{dialect}.
+%    \begin{macrocode}
+\def\GetTrackedLanguageTag#1{%
+  \IfTrackedLanguageHasIsoCode{639-1}{\TrackedLanguageFromDialect{#1}}%
+  {\TrackedIsoCodeFromLanguage{639-1}{\TrackedLanguageFromDialect{#1}}}%
+  {%
+    \IfTrackedLanguageHasIsoCode{639-2}{\TrackedLanguageFromDialect{#1}}%
+    {\TrackedIsoCodeFromLanguage{639-2}{\TrackedLanguageFromDialect{#1}}}%
+    {%
+      \IfTrackedLanguageHasIsoCode{639-3}{\TrackedLanguageFromDialect{#1}}%
+      {\TrackedIsoCodeFromLanguage{639-3}{\TrackedLanguageFromDialect{#1}}}%
+      {und}% undefined
+    }%
+  }%
+  \@tracklang@ifundef{@tracklang@sublang@#1}%
+  {}%
+  {-\csname @tracklang@sublang@#1\endcsname}%
+  \@tracklang@ifundef{@tracklang@script@#1}%
+  {}%
+  {-\csname @tracklang@script@#1\endcsname}%
+  \IfTrackedLanguageHasIsoCode{3166-1}{#1}%
+  {-\TrackedIsoCodeFromLanguage{3166-1}{#1}}%
+  {}%
+  \@tracklang@ifundef{@tracklang@variant@#1}%
+  {}%
+  {-\csname @tracklang@variant@#1\endcsname}%
+  \@tracklang@ifundef{@tracklang@extra@#1}%
+  {}%
+  {-\csname @tracklang@extra@#1\endcsname}%
+}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\SetCurrentTrackedDialect}
+%\changes{1.3}{2016-10-07}{new}
+%\begin{definition}
+%\cs{SetCurrentTrackedDialect}\marg{dialect}
+%\end{definition}
+%Provided for use by language hooks to establish the current tracked
+%dialect. This command doesn't change \cs{languagename} or
+%hyphenation patterns etc. It just provides convenient commands that
+%can be accessed. The argument may be a \styfmt{tracklang} dialect
+%label or the language hook label from which a \styfmt{tracklang}
+%dialect label can be obtained or the root language label.
+%\changes{1.3.3}{2016-11-03}{fixed mapping}
+%    \begin{macrocode}
+\def\SetCurrentTrackedDialect#1{%
+  \edef\CurrentTrackedDialect{#1}%
+  \IfTrackedDialect{\CurrentTrackedDialect}%
+  {}%
+  {%
+%    \end{macrocode}
+% Has a mapping from this dialect to a tracklang dialect been supplied?
+%    \begin{macrocode}
+    \IfHookHasMappingFromTrackedDialect{\CurrentTrackedDialect}%
+    {%
+      \IfTrackedDialect{\GetTrackedDialectFromMapping\CurrentTrackedDialect}%
+      {%
+        \edef\CurrentTrackedDialect{\GetTrackedDialectFromMapping
+          {\CurrentTrackedDialect}}%
+      }%
+      {%
+%    \end{macrocode}
+% Has the root language name been supplied?
+%    \begin{macrocode}
+        \IfTrackedLanguage{#1}%
+        {%
+%    \end{macrocode}
+% Get the last dialect to be tracked with this language.
+%  \begin{macrocode}
+          \edef\@tracklang@dialects{\TrackedDialectsFromLanguage{#1}}%
+          \@tracklang@for\@tracklang@dialect:=\@tracklang@dialects\do{%
+            \let\CurrentTrackedDialect\@tracklang@dialect
+          }%
+        }%
+        {}%
+      }%
+    }%
+    {%
+%    \end{macrocode}
+% Has the root language name been supplied?
+%    \begin{macrocode}
+      \IfTrackedLanguage{#1}%
+      {%
+%    \end{macrocode}
+% Get the last dialect to be tracked with this language.
+%  \begin{macrocode}
+        \edef\@tracklang@dialects{\TrackedDialectsFromLanguage{#1}}%
+        \@tracklang@for\@tracklang@dialect:=\@tracklang@dialects\do{%
+          \let\CurrentTrackedDialect\@tracklang@dialect
+        }%
+      }%
+      {}%
+    }%
+  }%
+  \IfTrackedDialect{\CurrentTrackedDialect}%
+  {%
+    \edef\CurrentTrackedLanguage{%
+      \TrackedLanguageFromDialect{\CurrentTrackedDialect}}%
+    \edef\CurrentTrackedDialectModifier{%
+      \GetTrackedDialectModifier{\CurrentTrackedDialect}}%
+    \edef\CurrentTrackedDialectVariant{%
+      \GetTrackedDialectVariant{\CurrentTrackedDialect}}%
+%    \end{macrocode}
+% Get the default script if not set.
+%    \begin{macrocode}
+    \IfHasTrackedDialectScript{\CurrentTrackedDialect}%
+    {%
+      \edef\CurrentTrackedDialectScript{%
+        \GetTrackedDialectScript{\CurrentTrackedDialect}}%
+    }%
+    {%
+      \edef\CurrentTrackedDialectScript{%
+        \TrackLangGetDefaultScript\CurrentTrackedLanguage}%
+    }%
+    \edef\CurrentTrackedDialectSubLang{%
+      \GetTrackedDialectSubLang{\CurrentTrackedDialect}}%
+    \edef\CurrentTrackedDialectAdditional{%
+      \GetTrackedDialectAdditional{\CurrentTrackedDialect}}%
+    \edef\CurrentTrackedLanguageTag{%
+      \GetTrackedLanguageTag{\CurrentTrackedDialect}}%
+%    \end{macrocode}
+%Region code.
+%    \begin{macrocode}
+    \IfTrackedLanguageHasIsoCode{3166-1}{\CurrentTrackedDialect}%
+    {%
+      \edef\CurrentTrackedRegion{%
+       \TrackedIsoCodeFromLanguage{3166-1}{\CurrentTrackedDialect}}%
+    }%
+    {\def\CurrentTrackedRegion{}}%
+%    \end{macrocode}
+%Language code.
+%    \begin{macrocode}
+    \IfTrackedLanguageHasIsoCode{639-1}{\CurrentTrackedLanguage}%
+    {%
+      \edef\CurrentTrackedIsoCode{%
+       \TrackedIsoCodeFromLanguage{639-1}{\CurrentTrackedLanguage}}%
+    }%
+    {%
+      \IfTrackedLanguageHasIsoCode{639-2}{\CurrentTrackedLanguage}%
+      {%
+        \edef\CurrentTrackedIsoCode{%
+         \TrackedIsoCodeFromLanguage{639-2}{\CurrentTrackedLanguage}}%
+      }%
+      {%
+        \IfTrackedLanguageHasIsoCode{639-3}{\CurrentTrackedLanguage}%
+        {%
+          \edef\CurrentTrackedIsoCode{%
+           \TrackedIsoCodeFromLanguage{639-3}{\CurrentTrackedLanguage}}%
+        }%
+        {%
+          \def\CurrentTrackedIsoCode{}%
+        }%
+      }%
+    }%
+  }%
+  {%
+    \@tracklang@warn{Unknown dialect label `#1' passed to 
+      \string\SetCurrentTrackedDialect}%
+    \edef\CurrentTrackedLanguage{\languagename}%
+    \def\CurrentTrackedDialectModifier{}%
+    \def\CurrentTrackedDialectVariant{}%
+    \def\CurrentTrackedDialectScript{}%
+    \def\CurrentTrackedDialectSubLang{}%
+    \def\CurrentTrackedDialectAdditional{}%
+    \def\CurrentTrackedIsoCode{}%
+    \def\CurrentTrackedRegion{}%
+    \def\CurrentTrackedLanguageTag{und}%
+  }%
+}
+%    \end{macrocode}
+%\end{macro}
+%
+%
+%\begin{macro}{\AddTrackedLanguageIsoCodes}
+%\changes{1.3}{2016-10-07}{new}
+%\begin{definition}
+%\cs{AddTrackedLanguageIsoCodes}\marg{language}
+%\end{definition}
+%Adds the ISO 639-1 and 639-2 ISO codes for the given language,
+%which must have previously been declared using
+%\cs{TrackLangNewLanguage}.
+%    \begin{macrocode}
+\def\AddTrackedLanguageIsoCodes#1{%
+  \@tracklang@ifundef{@tracklang@knowniso@639@1@#1}%
+  {}%
+  {%
+    \AddTrackedIsoLanguage\TwoLetterIsoLanguageCode
+      {\csname @tracklang@knowniso@639@1@#1\endcsname}{#1}%
+  }%
+  \@tracklang@ifundef{@tracklang@knowniso@639@2@#1}%
+  {}%
+  {%
+    \AddTrackedIsoLanguage\ThreeLetterIsoLanguageCode
+       {\csname @tracklang@knowniso@639@2@#1\endcsname}{#1}%
+%    \end{macrocode}
+% Does it have a different 639-2 (B) code?
+%    \begin{macrocode}
+    \@tracklang@ifundef{@tracklang@knowniso@639@2B@#1}%
+    {}%
+    {%
+      \AddTrackedIsoLanguage{\ThreeLetterIsoLanguageCode-T}%
+         {\csname @tracklang@knowniso@639@2@#1\endcsname}{#1}%
+      \AddTrackedIsoLanguage{\ThreeLetterIsoLanguageCode-B}%
+         {\csname @tracklang@knowniso@639@2B@#1\endcsname}{#1}%
+    }%
+  }%
+  \@tracklang@ifundef{@tracklang@knowniso@639@3@#1}%
+  {}%
+  {%
+    \AddTrackedIsoLanguage\ThreeLetterExtIsoLanguageCode
+      {\csname @tracklang@knowniso@639@3@#1\endcsname}{#1}%
+  }%
+}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\AddTrackedCountryIsoCode}
+%\changes{1.3}{2016-10-07}{new}
+%As above but adds the 3166-1 country code if provided. Most
+%root languages don't have an associated country code as they're
+%spoken in multiple regions. Some of those that do have an
+%associated region code may also be spoken as a minority language
+%elsewhere, so this is separate from the previous command. If a
+%regionless setting is required, use \cs{TrackLocale} instead of 
+%\cs{TrackPredefinedDialect}.
+%    \begin{macrocode}
+\def\AddTrackedCountryIsoCode#1{%
+  \@tracklang@ifundef{@tracklang@knowniso@3166@#1}%
+  {}%
+  {%
+    \AddTrackedIsoLanguage{3166-1}%
+      {\csname @tracklang@knowniso@3166@#1\endcsname}{#1}%
+  }%
+}
+%    \end{macrocode}
+%\end{macro}
+%
+%\subsection{Tracking Languages and Dialects}\label{sec:tracking}
+%
+% The commands here are provided to indicate that a language or dialect
+% is active (tracked) in the document.
+%
+%\begin{macro}{\TrackPredefinedDialect}
+%\begin{definition}
+%\cs{TrackPredefinedDialect}\marg{dialect label}
+%\end{definition}
+% Track a predefined language or dialect.
+%    \begin{macrocode}
+\def\TrackPredefinedDialect#1{%
+  \@tracklang@ifundef{@tracklang@add@#1}%
+  {%
+    \@tracklang@err{Dialect or language `#1' is not predefined}{}%
+  }%
+  {\@tracklang@nameuse{@tracklang@add@#1}}%
+}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@hassecondchar}
+%\changes{1.3}{2016-10-07}{new}
+%Check if second argument is present (non-empty and not \cs{relax}).
+%    \begin{macrocode}
+\def\@tracklang@hassecondchar#1#2\@end@tracklang@hassecondchar#3#4{%
+  \ifx\relax#2\relax
+    #4%
+  \else
+    #3%
+  \fi
+}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@hasthirdchar}
+%\changes{1.3}{2016-10-07}{new}
+%Check if third argument is present (non-empty and not \cs{relax}).
+%    \begin{macrocode}
+\def\@tracklang@hasthirdchar#1#2#3\@end@tracklang@hasthirdchar#4#5{%
+  \ifx\relax#3\relax
+    #5%
+  \else
+    #4%
+  \fi
+}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@hasfourthchar}
+%\changes{1.3}{2016-10-07}{new}
+%Check if fourth argument is present (non-empty and not \cs{relax}).
+%    \begin{macrocode}
+\def\@tracklang@hasfourthchar#1#2#3#4\@end@tracklang@hasfourthchar#5#6{%
+  \ifx\relax#4\relax
+    #6%
+  \else
+    #5%
+  \fi
+}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@hasfifthchar}
+%\changes{1.3}{2016-10-07}{new}
+%Check if fifth argument is present (non-empty and not \cs{relax}).
+%    \begin{macrocode}
+\def\@tracklang@hasfifthchar#1#2#3#4#5\@end@tracklang@hasfifthchar#6#7{%
+  \ifx\relax#5\relax
+    #7%
+  \else
+    #6%
+  \fi
+}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@hasninthchar}
+%\changes{1.3}{2016-10-07}{new}
+%Check if ninth argument is present (non-empty and not \cs{relax}).
+%    \begin{macrocode}
+\def\@tracklang@hasninthchar#1#2#3#4#5#6#7#8#9\@end@tracklang@hasninthchar{%
+  \ifx\relax#9\relax
+    \expandafter\@tracklang@secondoftwo
+  \else
+    \expandafter\@tracklang@firstoftwo
+  \fi
+}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@ifalpha}
+%\changes{1.3}{2016-10-07}{new}
+%Check if argument a, \ldots, z or A, \ldots, Z.
+%    \begin{macrocode}
+\def\@tracklang@ifalpha#1#2#3{%
+  \ifx\relax#1\relax
+%    \end{macrocode}
+%First argument empty or \cs{relax}.
+%    \begin{macrocode}
+    #3%
+  \else
+   \ifnum\lccode`#1<`a\relax
+     #3%
+   \else
+     \ifnum\lccode`#1>`z\relax
+      #3%
+     \else
+%    \end{macrocode}
+% Is alpha.
+%    \begin{macrocode}
+       #2%
+     \fi
+   \fi
+  \fi
+}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@ifdigit}
+%\changes{1.3}{2016-10-07}{new}
+%Check if argument is digit (0,\ldots,9).
+%    \begin{macrocode}
+\def\@tracklang@ifdigit#1#2#3{%
+  \ifx\relax#1\relax
+%    \end{macrocode}
+%First argument empty or \cs{relax}.
+%    \begin{macrocode}
+    #3%
+  \else
+   \ifnum`#1<`0\relax
+     #3%
+   \else
+     \ifnum`#1>`9\relax
+      #3%
+     \else
+%    \end{macrocode}
+% Is digit.
+%    \begin{macrocode}
+       #2%
+     \fi
+   \fi
+  \fi
+}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@ifalldigits}
+%\changes{1.3}{2016-10-07}{new}
+%Check if the argument only consists of digits (no sign).
+%    \begin{macrocode}
+\def\@tracklang@ifalldigits#1{%
+ \expandafter\ifx\relax#1\relax
+   \expandafter\@tracklang@secondoftwo
+ \else
+   \expandafter\@@tracklang@ifalldigits#1\@tracklang@nnil
+ \fi
+}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@@tracklang@ifalldigits}
+%    \begin{macrocode}
+\def\@@tracklang@ifalldigits#1{%
+  \ifx#1\@tracklang@nnil
+   \def\@tracklang@next{\expandafter\@tracklang@firstoftwo}%
+  \else
+    \@tracklang@ifdigit{#1}%
+    {%
+      \let\@tracklang@next\@@tracklang@ifalldigits
+    }%
+    {%
+      \def\@tracklang@next##1\@tracklang@nnil{%
+        \expandafter\@tracklang@secondoftwo}%
+    }%
+  \fi
+  \@tracklang@next
+}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@ifalphanumeric}
+%\changes{1.3}{2016-10-07}{new}
+%Check if argument is an alphanumeric (0,\ldots,9) or (a,\ldots,z)
+%or (A,\ldots,Z).
+%    \begin{macrocode}
+\def\@tracklang@ifalphanumeric#1#2#3{%
+  \@tracklang@ifalpha{#1}%
+  {#2}%
+  {%
+    \@tracklang@ifdigit{#1}{#2}{#3}%
+  }%
+}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\TrackLangIfAlphaNumericChar}
+%\changes{1.3}{2016-10-07}{new}
+%\begin{definition}
+%\cs{TrackLangIfAlphaNumericChar}\marg{tag}\marg{true}\marg{false}
+%\end{definition}
+%Check if the argument is a single alphanumeric character.
+%    \begin{macrocode}
+\def\TrackLangIfAlphaNumericChar#1#2#3{%
+  \expandafter\ifx\expandafter\relax#1\relax
+%    \end{macrocode}
+% Tag empty or \cs{relax}.
+%    \begin{macrocode}
+    #3%
+  \else
+    \expandafter\@tracklang@hassecondchar#1\relax\relax
+      \@end@tracklang@hassecondchar
+    {#3}%
+    {\expandafter\@tracklang@ifalphanumeric#1{#2}{#3}}%
+  \fi
+}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\TrackLangIfLanguageTag}
+%\changes{1.3}{2016-10-07}{new}
+%\begin{definition}
+%\cs{TrackLangIfLanguageTag}\marg{tag}\marg{true}\marg{false}
+%\end{definition}
+%Check if the argument is a language tag (two or three letter
+%lower case).
+%    \begin{macrocode}
+\def\TrackLangIfLanguageTag#1#2#3{%
+  \expandafter\@tracklang@hasthirdchar#1\relax\relax\relax
+    \@end@tracklang@hasthirdchar
+  {%
+%    \end{macrocode}
+% Has 3 or more characters.
+%    \begin{macrocode}
+    \expandafter\@tracklang@hasfourthchar#1\relax\@end@tracklang@hasfourthchar
+    {#3}%
+    {%
+%    \end{macrocode}
+% Has 3 characters. Are they all lower case?
+%    \begin{macrocode}
+     \expandafter\@tracklang@iflanguage@iii@tag#1{#2}{#3}%
+    }%
+  }%
+  {%
+%    \end{macrocode}
+% Has less than 3 characters.
+%    \begin{macrocode}
+    \expandafter\@tracklang@hassecondchar#1\relax\relax
+      \@end@tracklang@hassecondchar
+    {%
+%    \end{macrocode}
+%Has two characters. Are they both lower case?
+%    \begin{macrocode}
+     \expandafter\@tracklang@iflanguage@ii@tag#1{#2}{#3}%
+    }%
+    {#3}%
+  }%
+}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@iflanguage@ii@tag}
+%\changes{1.3}{2016-10-07}{new}
+%    \begin{macrocode}
+\def\@tracklang@iflanguage@ii@tag#1#2#3#4{%
+  \ifnum\lccode`#1=`#1\relax
+    \ifnum\lccode`#2=`#2\relax
+      #3%
+    \else
+      #4%
+    \fi
+  \else
+    #4%
+  \fi
+}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@iflanguage@iii@tag}
+%\changes{1.3}{2016-10-07}{new}
+%    \begin{macrocode}
+\def\@tracklang@iflanguage@iii@tag#1#2#3#4#5{%
+  \ifnum\lccode`#1=`#1\relax
+    \ifnum\lccode`#2=`#2\relax
+      \ifnum\lccode`#3=`#3\relax
+        #4%
+      \else
+        #5%
+      \fi
+    \else
+      #5%
+    \fi
+  \else
+    #5%
+  \fi
+}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\TrackLangIfRegionTag}
+%\changes{1.3}{2016-10-07}{new}
+%\begin{definition}
+%\cs{TrackLangIfRegionTag}\marg{tag}\marg{true}\marg{false}
+%\end{definition}
+%Check if the argument is a region tag (two letter
+%upper case or three digit numeric).
+%    \begin{macrocode}
+\def\TrackLangIfRegionTag#1#2#3{%
+  \expandafter\@tracklang@hasthirdchar#1\relax\relax\relax
+    \@end@tracklang@hasthirdchar
+  {%
+%    \end{macrocode}
+% Has 3 or more characters. Is it a three digit numeric code?
+%    \begin{macrocode}
+    \expandafter\@tracklang@hasfourthchar#1\relax\@end@tracklang@hasfourthchar
+    {%
+%    \end{macrocode}
+% Has 4 or more characters.
+%    \begin{macrocode}
+      #3%
+    }%
+    {%
+%    \end{macrocode}
+% Has 3 characters. Are they all digits?
+%    \begin{macrocode}
+      \@tracklang@ifalldigits{#1}{#2}{#3}%
+    }%
+  }%
+  {%
+%    \end{macrocode}
+% Has less than 3 characters.
+%    \begin{macrocode}
+    \expandafter\@tracklang@hassecondchar#1\relax\relax
+      \@end@tracklang@hassecondchar
+    {%
+%    \end{macrocode}
+%Has two characters. Are they both upper case?
+%    \begin{macrocode}
+     \expandafter\@tracklang@ifregion@ii@tag#1{#2}{#3}%
+    }%
+    {#3}%
+  }%
+}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@ifregion@ii@tag}
+%\changes{1.3}{2016-10-07}{new}
+%    \begin{macrocode}
+\def\@tracklang@ifregion@ii@tag#1#2#3#4{%
+  \ifnum\uccode`#1=`#1\relax
+    \ifnum\uccode`#2=`#2\relax
+      #3%
+    \else
+      #4%
+    \fi
+  \else
+    #4%
+  \fi
+}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@ifregion@iii@tag}
+%\changes{1.3}{2016-10-07}{new}
+%    \begin{macrocode}
+\def\@tracklang@ifregion@iii@tag#1#2#3#4#5{%
+  \ifnum\uccode`#1=`#1\relax
+    \ifnum\uccode`#2=`#2\relax
+      \ifnum\uccode`#3=`#3\relax
+        #4%
+      \else
+        #5%
+      \fi
+    \else
+      #5%
+    \fi
+  \else
+    #5%
+  \fi
+}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\TrackLangIfScriptTag}
+%\changes{1.3}{2016-10-07}{new}
+%\begin{definition}
+%\cs{TrackLangIfScriptTag}\marg{tag}\marg{true}\marg{false}
+%\end{definition}
+%Check if the argument is a script tag (four letter
+%title case).
+%    \begin{macrocode}
+\def\TrackLangIfScriptTag#1#2#3{%
+  \expandafter\@tracklang@hasfifthchar#1\relax\relax\relax\relax\relax
+    \@end@tracklang@hasfifthchar
+  {#3}%
+  {%
+%    \end{macrocode}
+% Has less than 5 characters.
+%    \begin{macrocode}
+    \expandafter\@tracklang@hasfourthchar#1\relax\relax\relax\relax
+      \@end@tracklang@hasfourthchar
+    {%
+%    \end{macrocode}
+%Has four characters. Are they title case? (First letter upper case,
+%others lower case.)
+%    \begin{macrocode}
+     \expandafter\@tracklang@ifscripttag#1{#2}{#3}%
+    }%
+    {#3}%
+  }%
+}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@ifscripttag}
+%\changes{1.3}{2016-10-07}{new}
+%    \begin{macrocode}
+\def\@tracklang@ifscripttag#1#2#3#4#5#6{%
+  \ifnum\uccode`#1=`#1\relax
+    \ifnum\lccode`#2=`#2\relax
+      \ifnum\lccode`#3=`#3\relax
+        \ifnum\lccode`#4=`#4\relax
+          #5%
+        \else
+          #6%
+        \fi
+      \else
+        #6%
+      \fi
+    \else
+      #6%
+    \fi
+  \else
+    #6%
+  \fi
+}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\TrackLangIfVariantTag}
+%\changes{1.3}{2016-10-07}{new}
+%\begin{definition}
+%\cs{TrackLangIfVariantTag}\marg{tag}\marg{true}\marg{false}
+%\end{definition}
+%Check if the argument is a variant tag.
+%    \begin{macrocode}
+\def\TrackLangIfVariantTag#1#2#3{%
+  \expandafter\@tracklang@hasfifthchar#1\relax\relax\relax\relax\relax
+    \@end@tracklang@hasfifthchar
+  {%
+%    \end{macrocode}
+% Has at least 5 characters. Does it have a maximum of 8?
+%    \begin{macrocode}
+    \expandafter\@tracklang@hasninthchar#1\relax\relax\relax\relax\relax
+      \relax\relax\relax\relax
+      \@end@tracklang@hasninthchar
+    {#3}%
+    {#2}%
+  }%
+  {%
+%    \end{macrocode}
+%Less than 5 characters.
+%    \begin{macrocode}
+    \expandafter\@tracklang@hasfourthchar#1\relax\relax\relax\relax
+      \@end@tracklang@hasfourthchar
+    {%
+%    \end{macrocode}
+%Has 4 characters.
+%    \begin{macrocode}
+      \expandafter\@tracklang@ifvariant@iv@tag#1{#2}{#3}%
+    }%
+    {#3}%
+  }%
+}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@ifvariant@iv@tag}
+%\changes{1.3}{2016-10-07}{new}
+%four character variant starting with a digit.
+%    \begin{macrocode}
+\def\@tracklang@ifvariant@iv@tag#1#2#3#4#5#6{%
+  \@tracklang@ifdigit{#1}%
+  {#5}
+  {#6}%
+}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@parse@extlang}
+%\cs{@TrackLangEnvSubLang}, \cs{@tracklang@split@pre} and
+%\cs{\@tracklang@split@post} should be initialised before use.
+%This assumes the tag is well formed.
+%    \begin{macrocode}
+\def\@tracklang@parse@extlang{%
+   \TrackLangIfLanguageTag{\@tracklang@split@pre}
+   {%
+     \ifx\@TrackLangEnvSubLang\empty
+       \let\@TrackLangEnvSubLang\@tracklang@split@pre
+       \let\@TrackLangEnvFirstSubLang\@TrackLangEnvSubLang
+     \else
+       \edef\@TrackLangEnvSubLang{\@TrackLangEnvSubLang-\@tracklang@split@pre}%
+     \fi
+%    \end{macrocode}
+%Split again if there's more.
+%    \begin{macrocode}
+     \ifx\@tracklang@split@post\empty
+     \else
+       \expandafter\@tracklang@split@underscoreorhyp\expandafter
+         {\@tracklang@split@post}%
+       \ifx\@tracklang@split@pre\empty
+       \else
+         \@tracklang@parse@extlang
+       \fi
+     \fi
+   }%
+   {}%
+}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@parse@variant}
+%\cs{@TrackLangEnvVariant}, \cs{@tracklang@split@pre} and
+%\cs{\@tracklang@split@post} should be initialised before use.
+%    \begin{macrocode}
+\def\@tracklang@parse@variant{%
+   \TrackLangIfVariantTag{\@tracklang@split@pre}
+   {%
+     \ifx\@TrackLangEnvVariant\empty
+       \let\@TrackLangEnvVariant\@tracklang@split@pre
+     \else
+       \edef\@TrackLangEnvVariant{\@TrackLangEnvVariant
+         -\@tracklang@split@pre}%
+     \fi
+%    \end{macrocode}
+%Split again if there's more.
+%    \begin{macrocode}
+     \ifx\@tracklang@split@post\empty
+     \else
+       \expandafter\@tracklang@split@underscoreorhyp\expandafter
+         {\@tracklang@split@post}%
+       \ifx\@tracklang@split@pre\empty
+       \else
+         \@tracklang@parse@variant
+       \fi
+     \fi
+   }%
+   {}%
+}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\TrackLanguageTag}
+%\begin{definition}
+%\cs{TrackLanguageTag}\marg{tag}
+%\end{definition}
+%\changes{1.3}{2016-10-07}{new}
+%Parse RFC 5646 language tag (assumes regular and well-formed).
+%See also \url{https://tools.ietf.org/html/rfc5646}.
+%Ensure \meta{tag} is fully-expanded. Warn if argument is
+%empty.
+%    \begin{macrocode}
+\def\TrackLanguageTag#1{%
+  \edef\@tracklang@tag{#1}%
+  \ifx\@tracklang@tag\empty
+    \@tracklang@warn{Empty tag in \string\TrackLanguageTag}% 
+  \else
+    \expandafter\@TrackLanguageTag\expandafter{\@tracklang@tag}%
+  \fi
+}
+%    \end{macrocode}
+%\end{macro}
+%\begin{macro}{\@TrackLanguageTag}
+%Argument must be expanded.
+%    \begin{macrocode}
+\def\@TrackLanguageTag#1{%
+%    \end{macrocode}
+%First check if it's predefined.
+%    \begin{macrocode}
+  \@tracklang@ifundef{@tracklang@add@#1}%
+  {%
+%    \end{macrocode}
+%Parse language tag.
+%    \begin{macrocode}
+     \@tracklang@parselangtag{#1}%
+%    \end{macrocode}
+%Track this information.
+%    \begin{macrocode}
+     \@tracklang@track@locale
+  }%
+  {%
+%    \end{macrocode}
+%Predefined tag.
+%    \begin{macrocode}
+    \@tracklang@nameuse{@tracklang@add@#1}%
+  }%
+}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@parse@langtag}
+%\changes{1.3}{2016-10-07}{new}
+%    \begin{macrocode}
+\def\@tracklang@parselangtag#1{%
+%    \end{macrocode}
+%Initialise.
+%    \begin{macrocode}
+  \def\@TrackLangEnvLang{}%
+  \def\@TrackLangEnvSubLang{}%
+  \def\@TrackLangEnvFirstSubLang{}%
+  \def\@TrackLangEnvTerritory{}%
+  \def\@TrackLangEnvCodeSet{}%
+  \def\@TrackLangEnvVariant{}%
+  \def\@TrackLangEnvModifier{}%
+  \def\@TrackLangEnvScript{}%
+  \def\@TrackLangEnvAdditional{}%
+%    \end{macrocode}
+%First split to determine language code.
+%    \begin{macrocode}
+  \@tracklang@split@underscoreorhyp{#1}%
+%    \end{macrocode}
+%Save the result.
+%    \begin{macrocode}
+  \let\@TrackLangEnvLang\@tracklang@split@pre
+%    \end{macrocode}
+%Is there anything else?
+%    \begin{macrocode}
+  \ifx\@tracklang@split@post\empty
+%    \end{macrocode}
+%That's it.
+%    \begin{macrocode}
+  \else
+%    \end{macrocode}
+%Split again.
+%    \begin{macrocode}
+     \expandafter\@tracklang@split@underscoreorhyp\expandafter
+       {\@tracklang@split@post}%
+%    \end{macrocode}
+%Is this an extension to the language tag?
+%    \begin{macrocode}
+     \@tracklang@parse@extlang
+%    \end{macrocode}
+%Does this fit the format for a script?
+%    \begin{macrocode}
+     \TrackLangIfScriptTag{\@tracklang@split@pre}%
+     {%
+%    \end{macrocode}
+%Found script.
+%    \begin{macrocode}
+       \let\@TrackLangEnvScript\@tracklang@split@pre
+%    \end{macrocode}
+%Split again if there's more.
+%    \begin{macrocode}
+       \ifx\@tracklang@split@post\empty
+       \else
+         \expandafter\@tracklang@split@underscoreorhyp\expandafter
+           {\@tracklang@split@post}%
+       \fi
+     }%
+     {}%
+%    \end{macrocode}
+%Does this fit the format for a region?
+%    \begin{macrocode}
+     \TrackLangIfRegionTag{\@tracklang@split@pre}%
+     {%
+%    \end{macrocode}
+%Found region. Is it a 2 letter alpha or a 3 digit numeric code?
+%    \begin{macrocode}
+       \expandafter\@tracklang@hasthirdchar\@tracklang@split@pre
+          \relax\relax\relax
+          \@end@tracklang@hasthirdchar
+       {%
+%    \end{macrocode}
+% Is three digit numeric code. We need the mappings. Has
+% \texttt{tracklang-region-codes.tex} been loaded?
+%    \begin{macrocode}
+         \ifx\TrackLangIfKnownNumericRegion\undefined
+           \@tracklang@input tracklang-region-codes.tex
+         \fi
+         \TrackLangIfKnownNumericRegion{\@tracklang@split@pre}%
+         {%
+           \edef\@TrackLangEnvTerritory{%
+             \TrackLangNumericToAlphaIIRegion{\@tracklang@split@pre}%
+           }%
+         }%
+         {%
+           \let\@TrackLangEnvTerritory\@tracklang@split@pre
+           \@tracklang@warn{Unrecognised numeric region code 
+             `\@tracklang@split@pre'}%
+         }%
+       }%
+       {%
+%    \end{macrocode}
+% Is two letter alpha code.
+%    \begin{macrocode}
+         \let\@TrackLangEnvTerritory\@tracklang@split@pre
+       }%
+     \expandafter\@tracklang@split@underscoreorhyp\expandafter
+         {\@tracklang@split@post}%
+     }%
+     {}%
+%    \end{macrocode}
+%Parse for variant.
+%    \begin{macrocode}
+     \@tracklang@parse@variant
+%    \end{macrocode}
+%Anything left can go in additional.
+%    \begin{macrocode}
+     \let\@TrackLangEnvAdditional\@tracklang@split@post
+  \fi
+}%
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\GetTrackedDialectFromLanguageTag}
+%\changes{1.3}{2016-10-07}{new}
+%\begin{definition}
+%\cs{GetTrackedDialectFromLanguageTag}\marg{tag}\marg{cs}
+%\end{definition}
+%Find the tracked dialect that matches the given language tag and
+%stores the dialect label in \meta{cs}. If no match found, \meta{cs}
+%will be empty. Just tests the root language, script, variant, 
+%sub-language and region. Doesn't check the additional information. 
+%As from v1.3.6, this sets \cs{TrackedDialectClosestSubMatch} to the
+%closest sub-match.
+%    \begin{macrocode}
+\def\GetTrackedDialectFromLanguageTag#1#2{%
+%    \end{macrocode}
+%Initialise default values (in case of no match).
+%\changes{1.3.6}{2018-05-13}{added \cs{TrackedDialectClosestSubMatch}}
+%    \begin{macrocode}
+  \def#2{}%
+  \def\TrackedDialectClosestSubMatch{}%
+  \@tracklang@parselangtag{#1}%
+  \edef\@tracklang@dialect{%
+   \@TrackLangEnvLang
+   \@TrackLangEnvSubLang
+   \@TrackLangEnvScript
+   \@TrackLangEnvTerritory
+   \@TrackLangEnvModifier
+   \@TrackLangEnvVariant}%
+%    \end{macrocode}
+% Has this dialect label been tracked?
+%    \begin{macrocode}
+  \IfTrackedDialect{\@tracklang@dialect}%
+  {%
+%    \end{macrocode}
+% Found it. All done.
+%    \begin{macrocode}
+      \let#2\@tracklang@dialect
+  }%
+  {%
+%    \end{macrocode}
+% Get the root language label.
+%    \begin{macrocode}
+      \edef\@tracklang@lang{\TrackLangGetKnownLangFromIso\@TrackLangEnvLang}%
+%    \end{macrocode}
+% Get the default script for this language.
+%    \begin{macrocode}
+      \edef\@tracklang@defscript{\TrackLangGetDefaultScript\@tracklang@lang}%
+%    \end{macrocode}
+% Keep track of best match.
+%    \begin{macrocode}
+     \def\@tracklang@bestmatch{0}%
+%    \end{macrocode}
+% Get the list of tracked dialects for this language.
+%    \begin{macrocode}
+      \edef\@tracklang@dialects{\TrackedDialectsFromLanguage\@tracklang@lang}%
+%    \end{macrocode}
+% For each dialect in this list, check if it matches. 
+%    \begin{macrocode}
+      \@tracklang@for\@tracklang@dialect:=\@tracklang@dialects\do{%
+%    \end{macrocode}
+% Does the script match? (Initialise to no.)
+%    \begin{macrocode}
+        \def\@tracklang@currentmatch{0}%
+        \edef\@tracklang@tmp{%
+          \GetTrackedDialectScript{\@tracklang@dialect}}%
+        \ifx\@tracklang@tmp\@TrackLangEnvScript
+%    \end{macrocode}
+% Script matches.
+%    \begin{macrocode}
+          \def\@tracklang@currentmatch{1}%
+        \else
+%    \end{macrocode}
+% Script doesn't match. If no script has been provided, does this
+% dialect's script match the default for this language? 
+%    \begin{macrocode}
+          \ifx\@TrackLangEnvScript\empty
+            \ifx\@tracklang@tmp\@tracklang@defscript
+%    \end{macrocode}
+% Default script matches. 
+%    \begin{macrocode}
+              \def\@tracklang@currentmatch{1}%
+            \fi
+          \fi
+        \fi
+%    \end{macrocode}
+% Does the sub-language match?
+%    \begin{macrocode}
+        \edef\@tracklang@tmp{%
+          \GetTrackedDialectSubLang{\@tracklang@dialect}}%
+        \ifx\@tracklang@tmp\@TrackLangEnvSubLang
+%    \end{macrocode}
+% Sub-language matches. 
+%    \begin{macrocode}
+          \edef\@tracklang@currentmatch{\@tracklang@currentmatch 1}%
+        \else
+%    \end{macrocode}
+% Sub-language doesn't match. 
+%    \begin{macrocode}
+          \edef\@tracklang@currentmatch{\@tracklang@currentmatch 0}%
+        \fi
+%    \end{macrocode}
+% Does the variant match?
+%    \begin{macrocode}
+        \edef\@tracklang@tmp{%
+          \GetTrackedDialectVariant{\@tracklang@dialect}}%
+        \ifx\@tracklang@tmp\@TrackLangEnvVariant
+%    \end{macrocode}
+% Variant matches. 
+%    \begin{macrocode}
+          \edef\@tracklang@currentmatch{\@tracklang@currentmatch 1}%
+        \else
+%    \end{macrocode}
+% Variant doesn't match. 
+%    \begin{macrocode}
+          \edef\@tracklang@currentmatch{\@tracklang@currentmatch 0}%
+        \fi
+%    \end{macrocode}
+% Does the region match?
+%    \begin{macrocode}
+        \edef\@tracklang@tmp{%
+          \TrackedIsoCodeFromLanguage{3166-1}{\@tracklang@dialect}}%
+        \ifx\@tracklang@tmp\@TrackLangEnvTerritory
+%    \end{macrocode}
+% Region matches. 
+%    \begin{macrocode}
+          \edef\@tracklang@currentmatch{\@tracklang@currentmatch 1}%
+        \else
+%    \end{macrocode}
+% Region doesn't match. 
+%    \begin{macrocode}
+          \edef\@tracklang@currentmatch{\@tracklang@currentmatch 0}%
+        \fi
+%    \end{macrocode}
+% Do all four match? 
+%    \begin{macrocode}
+        \ifx\@tracklang@currentmatch\@tracklang@fullmatch
+%    \end{macrocode}
+% Found it. 
+%    \begin{macrocode}
+          \let#2\@tracklang@dialect
+        \else
+%    \end{macrocode}
+% Not a complete match. Is this the best match so far? 
+%    \begin{macrocode}
+          \ifnum\@tracklang@currentmatch>\@tracklang@bestmatch\relax
+            \let\TrackedDialectClosestSubMatch\@tracklang@dialect
+            \let\@tracklang@bestmatch\@tracklang@currentmatch
+          \fi
+        \fi
+     }%
+  }%
+}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@fullmatch}
+%\changes{1.3.6}{2018-05-13}{new}
+%(Used to identify a full match for script, sub-language, variant
+%and region.)
+%    \begin{macrocode}
+\def\@tracklang@fullmatch{1111}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\TrackLangFromEnv}
+%\changes{1.3}{2016-10-07}{new}
+% This command performs the following steps:
+% query environment variable (if \cs{TrackLangEnv} not already set),
+% parse \cs{TrackLangEnv} (if it has been set), and add the dialect
+% (if recognised).
+%
+% Note that this works slightly differently from just using
+% \cs{TrackLangQueryEnv} followed by \cs{TrackLangParseFromEnv}
+% and \cs{TrackPredefinedDialect}. 
+%    \begin{macrocode}
+\def\TrackLangFromEnv{%
+%    \end{macrocode}
+%Initialise.
+%    \begin{macrocode}
+ \def\TrackLangEnvLang{}%
+ \def\TrackLangEnvTerritory{}%
+ \def\TrackLangEnvCodeSet{}%
+ \def\TrackLangEnvModifier{}%
+%    \end{macrocode}
+%If \cs{TrackQueryEnv} is empty, assume \cs{TrackQueryEnv} has already
+%been attempted but failed, so don't bother retrying.
+%    \begin{macrocode}
+  \ifx\TrackLangEnv\undefined
+    \TrackLangQueryEnv
+  \fi
+  \ifx\TrackLangEnv\empty
+     \@tracklang@warn{\string\TrackLangFromEnv\space
+     non-operational as \string\TrackLangEnv\space is empty}%
+  \else
+%    \end{macrocode}
+% At this point \cs{TrackLangEnv} shouldn't be undefined (if
+% \cs{TrackLangQueryEnv} fails it should define \cs{TrackLangEnv} to
+% be empty), but check in case something unexpected has happened.
+%    \begin{macrocode}
+    \ifx\TrackLangEnv\undefined
+       \@tracklang@warn{\string\TrackLangFromEnv\space
+       non-operational as \string\TrackLangEnv\space hasn't been
+       defined}%
+    \else
+%    \end{macrocode}
+% Parse and track.
+%    \begin{macrocode}
+       \@tracklang@parse@track@locale{\TrackLangEnv}%
+       \let\TrackLangEnvLang\@TrackLangEnvLang
+       \let\TrackLangEnvTerritory\@TrackLangEnvTerritory
+       \let\TrackLangEnvCodeSet\@TrackLangEnvCodeSet
+       \let\TrackLangEnvModifier\@TrackLangEnvModifier
+    \fi
+  \fi
+}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\TrackLocale}
+%\begin{definition}
+%\cs{TrackLocale}\marg{locale}
+%\end{definition}
+%\changes{1.3}{2016-10-07}{new}
+%Track the dialect identified by the given locale. The argument may
+%either be a predefined language\slash dialect or in the same format as
+%\cs{TrackLangEnv}.
+%    \begin{macrocode}
+\def\TrackLocale#1{%
+%    \end{macrocode}
+% Is the argument a recognised dialect?
+%    \begin{macrocode}
+  \@tracklang@ifundef{@tracklang@add@#1}%
+  {%
+    \@tracklang@parse@track@locale{#1}%
+  }%
+  {%
+    \@tracklang@nameuse{@tracklang@add@#1}%
+  }%
+}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@parse@track@locale}
+%\changes{1.3}{2016-10-07}{new}
+%Parse localisation format and track.
+%    \begin{macrocode}
+\def\@tracklang@parse@track@locale#1{%
+  \@tracklang@parse@locale{#1}%
+  \@tracklang@track@locale
+}
+%    \end{macrocode}
+%\end{macro}
+%\begin{macro}{\@tracklang@track@locale}
+%\changes{1.3}{2016-10-07}{new}
+%    \begin{macrocode}
+\def\@tracklang@track@locale{%
+%    \end{macrocode}
+% Is the language code known?
+%    \begin{macrocode}
+  \TrackLangIfKnownLangFromIso{\@TrackLangEnvLang}
+  {%
+    \edef\@tracklang@lang{\TrackLangGetKnownLangFromIso\@TrackLangEnvLang}%
+    \let\@tracklang@dialect\@TrackLangEnvLang
+    \ifx\@TrackLangEnvSubLang\empty
+    \else
+      \edef\@tracklang@dialect{\@tracklang@dialect-\@TrackLangEnvSubLang}%
+    \fi
+    \ifx\@TrackLangEnvScript\empty
+    \else
+      \edef\@tracklang@dialect{\@tracklang@dialect-\@TrackLangEnvScript}%
+    \fi
+    \ifx\@TrackLangEnvTerritory\empty
+    \else
+      \edef\@tracklang@dialect{\@tracklang@dialect-\@TrackLangEnvTerritory}%
+    \fi
+    \ifx\@TrackLangEnvModifier\empty
+    \else
+      \edef\@tracklang@dialect{\@tracklang@dialect-\@TrackLangEnvModifier}%
+    \fi
+    \ifx\@TrackLangEnvVariant\empty
+    \else
+      \edef\@tracklang@dialect{\@tracklang@dialect-\@TrackLangEnvVariant}%
+    \fi
+%    \end{macrocode}
+% Language code is recognised. Is the dialect label recognised?
+%    \begin{macrocode}
+    \@tracklang@ifundef{@tracklang@add@\@tracklang@dialect}%
+    {%
+%    \end{macrocode}
+% Not a recognised dialect.
+% Form new dialect name (without hyphen).
+%    \begin{macrocode}
+       \edef\@tracklang@dialect{%
+         \@TrackLangEnvLang
+         \@TrackLangEnvSubLang
+         \@TrackLangEnvScript
+         \@TrackLangEnvTerritory
+         \@TrackLangEnvModifier
+         \@TrackLangEnvVariant}%
+%    \end{macrocode}
+% Add this new dialect.
+%    \begin{macrocode}
+       \AddTrackedDialect{\@tracklang@dialect}{\@tracklang@lang}%
+       \AddTrackedLanguageIsoCodes{\@tracklang@lang}%
+%    \end{macrocode}
+% Is there a sub-language tag?
+%    \begin{macrocode}
+       \ifx\@TrackLangEnvFirstSubLang\empty
+       \else
+         \expandafter\AddTrackedIsoLanguage
+           \expandafter\ThreeLetterExtIsoLanguageCode
+           \expandafter{\@TrackLangEnvFirstSubLang}%
+           {\@tracklang@dialect}%
+       \fi
+    }%
+    {%
+%    \end{macrocode}
+% Dialect is recognised.
+%    \begin{macrocode}
+      \csname @tracklang@add@\@tracklang@dialect\endcsname
+    }%
+  }%
+  {%
+%    \end{macrocode}
+% Unknown language code.
+%    \begin{macrocode}
+    \@tracklang@warn{Unknown language code `\@TrackLangEnvLang'}%
+    \edef\@tracklang@dialect{%
+      \@TrackLangEnvLang
+      \@TrackLangEnvSubLang
+      \@TrackLangEnvScript
+      \@TrackLangEnvTerritory
+      \@TrackLangEnvModifier
+      \@TrackLangEnvVariant}%
+    \AddTrackedDialect{\@tracklang@dialect}{\@TrackLangEnvLang}%
+%    \end{macrocode}
+% Determine if the language code is a two or three letter code.
+%    \begin{macrocode}
+    \expandafter\@tracklang@hasthirdchar
+       \@TrackLangEnvLang\relax\relax\relax\@end@tracklang@hasthirdchar
+     {%
+%    \end{macrocode}
+% 639-2 code. Track it.
+%    \begin{macrocode}
+       \AddTrackedIsoLanguage{639-2}{\@TrackLangEnvLang}{\@tracklang@lang}%
+     }%
+     {%
+%    \end{macrocode}
+% 639-1 code. Track it.
+%    \begin{macrocode}
+         \AddTrackedIsoLanguage{639-1}{\@TrackLangEnvLang}{\@tracklang@lang}%
+     }%
+  }%
+%    \end{macrocode}
+% Add the territory if provided. (The territory may not have been
+% defined by the dialect option.)
+%    \begin{macrocode}
+  \ifx\@TrackLangEnvTerritory\empty
+  \else
+    \AddTrackedIsoLanguage{3166-1}{\@TrackLangEnvTerritory}%
+     {\@tracklang@dialect}%
+  \fi
+%    \end{macrocode}
+% If a modifier was provided, add that.
+%    \begin{macrocode}
+  \ifx\@TrackLangEnvModifier\empty
+  \else
+    \SetTrackedDialectModifier{\@tracklang@dialect}{\@TrackLangEnvModifier}%
+  \fi
+%    \end{macrocode}
+% If a variant was provided, add that.
+%    \begin{macrocode}
+  \ifx\@TrackLangEnvVariant\empty
+  \else
+    \SetTrackedDialectVariant{\@tracklang@dialect}{\@TrackLangEnvVariant}%
+  \fi
+%    \end{macrocode}
+% If a script was provided, add that.
+%    \begin{macrocode}
+  \ifx\@TrackLangEnvScript\empty
+  \else
+    \SetTrackedDialectScript{\@tracklang@dialect}{\@TrackLangEnvScript}%
+  \fi
+%    \end{macrocode}
+% If a language extension was provided, add that.
+%    \begin{macrocode}
+  \ifx\@TrackLangEnvSubLang\empty
+  \else
+    \SetTrackedDialectSubLang{\@tracklang@dialect}{\@TrackLangEnvSubLang}%
+  \fi
+%    \end{macrocode}
+% If additional information was provided, add that.
+%    \begin{macrocode}
+  \ifx\@TrackLangEnvAdditional\empty
+  \else
+    \SetTrackedDialectAdditional{\@tracklang@dialect}{\@TrackLangEnvAdditional}%
+  \fi
+}
+%    \end{macrocode}
+%\end{macro}
+%
+%
+%\subsection{Predefined Root Languages}\label{sec:predefinedlang}
+%
+% The ISO 639-1 and 639-2 codes are used to map the root language name to the
+% ISO language code. The 3166-1 codes are used to map the
+% dialect\slash variant to the ISO country code. The country code is
+% omitted if ambiguous (for example, the language is spoken in
+% multiple countries). Languages that have a country code may be
+% spoken as a minority language in another region. In this case,
+% \cs{TrackLocale} should be used instead to set the country code as
+% appropriate. Some \qt{dialects} are just synonyms for a
+% language name, such as \qt{francais} or \qt{frenchb}. These are
+% defined in \sectionref{sec:predefined}.  Some of the
+% languages have two ISO 639-2 codes designated as \qt{B}
+% (bibliographic) or \qt{T} (terminology). In these cases the
+% terminology code is used as the primary 639-2 code. The extra
+% \qt{B} and \qt{T} codes are only provided if they are different.
+%
+%\begin{macro}{\@tracklang@declareoption}
+%\changes{1.1}{2014-11-21}{new}
+% Provide a hook to declare a predefined setting as a package
+% option. This is defined by tracklang.sty before loading
+% tracklang.tex but if this file isn't loaded through tracklang.sty
+% provide a definition that ignores its argument if not already
+% defined.
+%    \begin{macrocode}
+\ifx\@tracklang@declareoption\undefined
+  \def\@tracklang@declareoption#1{}
+\fi
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\TrackLangDeclareLanguageOption}
+%\changes{1.3}{2016-10-07}{new}
+%\begin{definition}
+%\cs{TrackLangDeclareLanguageOption}\marg{language name}\marg{639-1
+%code}\marg{639-2 (T)}\marg{639-2 (B)}\marg{639-3}\marg{3166-1}\marg{default
+%script}
+%\end{definition}
+%Define a new root language that's declared as an option.
+%The language name must be expanded before use. The default script
+%is the ISO 15924 alpha script code. (Some languages may be written
+%in multiple scripts. Leave empty if not obvious default.)
+%    \begin{macrocode}
+\def\TrackLangDeclareLanguageOption#1#2#3#4#5#6#7{%
+  \@tracklang@ifundef{@tracklang@add@#1}%
+  {%
+    \TrackLangNewLanguage{#1}{#2}{#3}{#4}{#5}{#6}{#7}%
+    \@tracklang@namedef{@tracklang@add@#1}{%
+      \AddTrackedLanguage{#1}%
+      \AddTrackedLanguageIsoCodes{#1}%
+      \AddTrackedCountryIsoCode{#1}%
+    }%
+    \@tracklang@declareoption{#1}%
+  }%
+  {%
+    \@tracklang@err{language option `#1' has already been defined}{}%
+  }%
+}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@add@abkhaz}
+%\changes{1.3}{2016-10-07}{new}
+%    \begin{macrocode}
+\TrackLangDeclareLanguageOption{abkhaz}{ab}{abk}{}{}{}{Cyrl}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@add@afar}
+%\changes{1.3}{2016-10-07}{new}
+%    \begin{macrocode}
+\TrackLangDeclareLanguageOption{afar}{aa}{aar}{}{}{}{Latn}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@add@afrikaans}
+%    \begin{macrocode}
+\TrackLangDeclareLanguageOption{afrikaans}{af}{afr}{}{}{}{Latn}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@add@akan}
+%\changes{1.3}{2016-10-07}{new}
+%    \begin{macrocode}
+\TrackLangDeclareLanguageOption{akan}{ak}{aka}{}{}{}{Latn}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@add@albanian}
+%    \begin{macrocode}
+\TrackLangDeclareLanguageOption{albanian}{sq}{sqi}{alb}{}{}{Latn}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@add@amharic}
+%    \begin{macrocode}
+\TrackLangDeclareLanguageOption{amharic}{am}{amh}{}{}{ET}{Ethi}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@add@anglosaxon}
+%    \begin{macrocode}
+\TrackLangDeclareLanguageOption{anglosaxon}{}{ang}{}{}{}{Runr}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@add@apache}
+%    \begin{macrocode}
+\TrackLangDeclareLanguageOption{apache}{}{apa}{}{}{}{Latn}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@add@arabic}
+%    \begin{macrocode}
+\TrackLangDeclareLanguageOption{arabic}{ar}{ara}{}{}{}{Arab}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@add@aragonese}
+%\changes{1.3}{2016-10-07}{new}
+%    \begin{macrocode}
+\TrackLangDeclareLanguageOption{aragonese}{an}{arg}{}{}{ES}{Latn}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@add@armenian}
+%    \begin{macrocode}
+\TrackLangDeclareLanguageOption{armenian}{hy}{hye}{arm}{}{}{Armn}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@add@assamese}
+%\changes{1.3}{2016-10-07}{new}
+%    \begin{macrocode}
+\TrackLangDeclareLanguageOption{assamese}{as}{asm}{}{}{}{Beng}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@add@asturian}
+%    \begin{macrocode}
+\TrackLangDeclareLanguageOption{asturian}{}{ast}{}{}{}{Latn}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@add@avaric}
+%\changes{1.3}{2016-10-07}{new}
+%    \begin{macrocode}
+\TrackLangDeclareLanguageOption{avaric}{av}{ava}{}{}{}{Cyrl}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@add@avestan}
+%\changes{1.3}{2016-10-07}{new}
+%    \begin{macrocode}
+\TrackLangDeclareLanguageOption{avestan}{ae}{ave}{}{}{}{Avst}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@add@aymara}
+%\changes{1.3}{2016-10-07}{new}
+%    \begin{macrocode}
+\TrackLangDeclareLanguageOption{aymara}{ay}{aym}{}{}{}{Latn}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@add@azerbaijani}
+%\changes{1.3}{2016-10-07}{new}
+%The default script is dependent on the region, but this is a
+%regionless definition so using Latin as the default here as
+%Azerbaijani alphabet is a Latin alphabet. Other countries may be 
+%using a different script, such as Cyrillic in Russia.
+%    \begin{macrocode}
+\TrackLangDeclareLanguageOption{azerbaijani}{az}{aze}{}{}{}{Latn}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@add@bahasai}
+%    \begin{macrocode}
+\TrackLangDeclareLanguageOption{bahasai}{id}{ind}{}{}{IN}{Latn}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@add@bahasam}
+%    \begin{macrocode}
+\TrackLangDeclareLanguageOption{bahasam}{ms}{msa}{may}{}{MY}{Latn}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@add@bambara}
+%\changes{1.3}{2016-10-07}{new}
+%    \begin{macrocode}
+\TrackLangDeclareLanguageOption{bambara}{bm}{bam}{}{}{ML}{Latn}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@add@bashkir}
+%\changes{1.3}{2016-10-07}{new}
+%    \begin{macrocode}
+\TrackLangDeclareLanguageOption{bashkir}{ba}{bak}{}{}{}{Cyrl}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@add@basque}
+%    \begin{macrocode}
+\TrackLangDeclareLanguageOption{basque}{eu}{eus}{baq}{}{}{Latn}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@add@belarusian}
+%\changes{1.3}{2016-10-07}{new}
+%    \begin{macrocode}
+\TrackLangDeclareLanguageOption{belarusian}{be}{bel}{}{}{}{Cyrl}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@add@bengali}
+%    \begin{macrocode}
+\TrackLangDeclareLanguageOption{bengali}{bn}{ben}{}{}{}{Beng}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@add@berber}
+%\changes{1.3}{2016-10-07}{new}
+%No default. Could be Tifinagh, Latin or Arabic.
+%    \begin{macrocode}
+\TrackLangDeclareLanguageOption{berber}{}{ber}{}{}{}{}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@add@bihari}
+%\changes{1.3}{2016-10-07}{new}
+%No clear default.
+%    \begin{macrocode}
+\TrackLangDeclareLanguageOption{bihari}{bh}{bih}{}{}{}{}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@add@bislama}
+%\changes{1.3}{2016-10-07}{new}
+%    \begin{macrocode}
+\TrackLangDeclareLanguageOption{bislama}{bi}{bis}{}{}{VU}{Latn}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@add@bokmal}
+%\changes{1.3}{2016-10-07}{new}
+%    \begin{macrocode}
+\TrackLangDeclareLanguageOption{bokmal}{nb}{nob}{}{}{NO}{Latn}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@add@bosnian}
+%\changes{1.3}{2016-10-07}{new}
+%    \begin{macrocode}
+\TrackLangDeclareLanguageOption{bosnian}{bs}{bos}{}{}{}{Latn}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@add@breton}
+%    \begin{macrocode}
+\TrackLangDeclareLanguageOption{breton}{br}{bre}{}{}{FR}{Latn}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@add@bulgarian}
+%    \begin{macrocode}
+\TrackLangDeclareLanguageOption{bulgarian}{bg}{bul}{}{}{}{Cyrl}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@add@burmese}
+%\changes{1.3}{2016-10-07}{new}
+%    \begin{macrocode}
+\TrackLangDeclareLanguageOption{burmese}{my}{mya}{bur}{}{}{Mymr}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@add@catalan}
+%    \begin{macrocode}
+\TrackLangDeclareLanguageOption{catalan}{ca}{cat}{}{}{}{Latn}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@add@chamorro}
+%\changes{1.3}{2016-10-07}{new}
+%    \begin{macrocode}
+\TrackLangDeclareLanguageOption{chamorro}{ch}{cha}{}{}{}{Latn}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@add@chechen}
+%\changes{1.3}{2016-10-07}{new}
+%    \begin{macrocode}
+\TrackLangDeclareLanguageOption{chechen}{ce}{che}{}{}{}{Cyrl}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@add@chichewa}
+%\changes{1.3}{2016-10-07}{new}
+%    \begin{macrocode}
+\TrackLangDeclareLanguageOption{chichewa}{ny}{nya}{}{}{}{Latn}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@add@chinese}
+%\changes{1.3}{2016-10-07}{new}
+%    \begin{macrocode}
+\TrackLangDeclareLanguageOption{chinese}{zh}{zho}{chi}{}{}{Hans}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@add@churchslavonic}
+%\changes{1.3}{2016-10-07}{new}
+%    \begin{macrocode}
+\TrackLangDeclareLanguageOption{churchslavonic}{cu}{chu}{}{}{}{Glag}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@add@chuvash}
+%\changes{1.3}{2016-10-07}{new}
+%    \begin{macrocode}
+\TrackLangDeclareLanguageOption{chuvash}{cv}{chv}{}{}{RU}{Cyrl}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@add@coptic}
+%    \begin{macrocode}
+\TrackLangDeclareLanguageOption{coptic}{}{cop}{}{}{}{Copt}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@add@cornish}
+%\changes{1.3}{2016-10-07}{new}
+%    \begin{macrocode}
+\TrackLangDeclareLanguageOption{cornish}{kw}{cor}{}{}{GB}{Latn}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@add@corsican}
+%\changes{1.3}{2016-10-07}{new}
+%    \begin{macrocode}
+\TrackLangDeclareLanguageOption{corsican}{co}{cos}{}{}{}{Latn}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@add@cree}
+%\changes{1.3}{2016-10-07}{new}
+%    \begin{macrocode}
+\TrackLangDeclareLanguageOption{cree}{cr}{cre}{}{}{}{Cans}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@add@croatian}
+%    \begin{macrocode}
+\TrackLangDeclareLanguageOption{croatian}{hr}{hrv}{}{}{}{Latn}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@add@czech}
+%    \begin{macrocode}
+\TrackLangDeclareLanguageOption{czech}{cs}{ces}{cze}{}{}{Latn}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@add@danish}
+%    \begin{macrocode}
+\TrackLangDeclareLanguageOption{danish}{da}{dan}{}{}{}{Latn}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@add@divehi}
+%    \begin{macrocode}
+\TrackLangDeclareLanguageOption{divehi}{dv}{div}{}{}{MV}{Thaa}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@add@dutch}
+%    \begin{macrocode}
+\TrackLangDeclareLanguageOption{dutch}{nl}{nld}{dut}{}{}{Latn}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@add@dzongkha}
+%\changes{1.3}{2016-10-07}{new}
+%    \begin{macrocode}
+\TrackLangDeclareLanguageOption{dzongkha}{dz}{dzo}{}{}{BT}{Tibt}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@add@easternpunjabi}
+%\changes{1.3}{2016-10-07}{new}
+%    \begin{macrocode}
+\TrackLangDeclareLanguageOption{easternpunjabi}{pa}{pan}{}{}{IN}{Guru}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@add@english}
+%    \begin{macrocode}
+\TrackLangDeclareLanguageOption{english}{en}{eng}{}{}{}{Latn}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@add@esperanto}
+%    \begin{macrocode}
+\TrackLangDeclareLanguageOption{esperanto}{eo}{epo}{}{}{}{Latn}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@add@estonian}
+%    \begin{macrocode}
+\TrackLangDeclareLanguageOption{estonian}{et}{est}{}{}{}{Latn}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@add@ewe}
+%\changes{1.3}{2016-10-07}{new}
+%    \begin{macrocode}
+\TrackLangDeclareLanguageOption{ewe}{ee}{ewe}{}{}{}{Latn}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@add@faroese}
+%\changes{1.3}{2016-10-07}{new}
+%    \begin{macrocode}
+\TrackLangDeclareLanguageOption{faroese}{fo}{fao}{}{}{}{Latn}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@add@farsi}
+%    \begin{macrocode}
+\TrackLangDeclareLanguageOption{farsi}{fa}{fas}{per}{}{}{Arab}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@add@fijian}
+%\changes{1.3}{2016-10-07}{new}
+%    \begin{macrocode}
+\TrackLangDeclareLanguageOption{fijian}{fj}{fij}{}{}{FJ}{Latn}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@add@finnish}
+%    \begin{macrocode}
+\TrackLangDeclareLanguageOption{finnish}{fi}{fin}{}{}{}{Latn}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@add@french}
+%    \begin{macrocode}
+\TrackLangDeclareLanguageOption{french}{fr}{fra}{fre}{}{}{Latn}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@add@friulan}
+%    \begin{macrocode}
+\TrackLangDeclareLanguageOption{friulan}{}{fur}{}{}{IT}{Latn}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@add@fula}
+%\changes{1.3}{2016-10-07}{new}
+%No default. Could be Latin or Arabic.
+%    \begin{macrocode}
+\TrackLangDeclareLanguageOption{fula}{ff}{ful}{}{}{}{}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@add@galician}
+%    \begin{macrocode}
+\TrackLangDeclareLanguageOption{galician}{gl}{glg}{}{}{}{Latn}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@add@ganda}
+%\changes{1.3}{2016-10-07}{new}
+%    \begin{macrocode}
+\TrackLangDeclareLanguageOption{ganda}{lg}{lug}{}{}{UG}{Latn}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@add@georgian}
+%\changes{1.3}{2016-10-07}{new}
+%    \begin{macrocode}
+\TrackLangDeclareLanguageOption{georgian}{ka}{kat}{geo}{}{}{Geor}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@add@german}
+%    \begin{macrocode}
+\TrackLangDeclareLanguageOption{german}{de}{deu}{ger}{}{}{Latn}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@add@greek}
+%    \begin{macrocode}
+\TrackLangDeclareLanguageOption{greek}{el}{ell}{gre}{}{}{Grek}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@add@guarani}
+%\changes{1.3}{2016-10-07}{new}
+%    \begin{macrocode}
+\TrackLangDeclareLanguageOption{guarani}{gn}{grn}{}{}{}{Latn}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@add@guiarati}
+%\changes{1.3}{2016-10-07}{new}
+%    \begin{macrocode}
+\TrackLangDeclareLanguageOption{gujarati}{gu}{guj}{}{}{}{Gujr}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@add@haitian}
+%\changes{1.3}{2016-10-07}{new}
+%    \begin{macrocode}
+\TrackLangDeclareLanguageOption{haitian}{ht}{hat}{}{}{HT}{Latn}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@add@hausa}
+%\changes{1.3}{2016-10-07}{new}
+%    \begin{macrocode}
+\TrackLangDeclareLanguageOption{hausa}{ha}{hau}{}{}{}{Latn}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@add@hebrew}
+%    \begin{macrocode}
+\TrackLangDeclareLanguageOption{hebrew}{he}{heb}{}{}{}{Hebr}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@add@herero}
+%\changes{1.3}{2016-10-07}{new}
+%    \begin{macrocode}
+\TrackLangDeclareLanguageOption{herero}{hz}{her}{}{}{}{Latn}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@add@hindi}
+%    \begin{macrocode}
+\TrackLangDeclareLanguageOption{hindi}{hi}{hin}{}{}{}{Deva}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@add@hirimotu}
+%\changes{1.3}{2016-10-07}{new}
+%    \begin{macrocode}
+\TrackLangDeclareLanguageOption{hirimotu}{ho}{hmo}{}{}{PG}{Latn}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@add@icelandic}
+%    \begin{macrocode}
+\TrackLangDeclareLanguageOption{icelandic}{is}{isl}{ice}{}{IS}{Latn}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@add@ido}
+%\changes{1.3}{2016-10-07}{new}
+%    \begin{macrocode}
+\TrackLangDeclareLanguageOption{ido}{io}{ido}{}{}{}{Latn}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@add@igbo}
+%\changes{1.3}{2016-10-07}{new}
+%    \begin{macrocode}
+\TrackLangDeclareLanguageOption{igbo}{ig}{ibo}{}{}{}{Latn}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@add@interlingua}
+%    \begin{macrocode}
+\TrackLangDeclareLanguageOption{interlingua}{ia}{ina}{}{}{}{Latn}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@add@interlingue}
+%\changes{1.3}{2016-10-07}{new}
+%    \begin{macrocode}
+\TrackLangDeclareLanguageOption{interlingue}{ie}{ile}{}{}{}{Latn}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@add@inuktitut}
+%\changes{1.3}{2016-10-07}{new}
+%    \begin{macrocode}
+\TrackLangDeclareLanguageOption{inuktitut}{iu}{iku}{}{}{}{Cans}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@add@inupiaq}
+%\changes{1.3}{2016-10-07}{new}
+%    \begin{macrocode}
+\TrackLangDeclareLanguageOption{inupiaq}{ik}{ipk}{}{}{}{Latn}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@add@irish}
+%    \begin{macrocode}
+\TrackLangDeclareLanguageOption{irish}{ga}{gle}{}{}{}{Latn}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@add@italian}
+%    \begin{macrocode}
+\TrackLangDeclareLanguageOption{italian}{it}{ita}{}{}{}{Latn}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@add@japanese}
+%\changes{1.3}{2016-10-07}{new}
+%    \begin{macrocode}
+\TrackLangDeclareLanguageOption{japanese}{ja}{jpn}{}{}{}{Hani}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@add@javanese}
+%\changes{1.3}{2016-10-07}{new}
+%    \begin{macrocode}
+\TrackLangDeclareLanguageOption{javanese}{jv}{jav}{}{}{}{Latn}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@add@kalaallisut}
+%\changes{1.3}{2016-10-07}{new}
+%    \begin{macrocode}
+\TrackLangDeclareLanguageOption{kalaallisut}{kl}{kal}{}{}{}{Latn}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@add@kannada}
+%    \begin{macrocode}
+\TrackLangDeclareLanguageOption{kannada}{kn}{kan}{}{}{IN}{Knda}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@add@kanuri}
+%\changes{1.3}{2016-10-07}{new}
+%    \begin{macrocode}
+\TrackLangDeclareLanguageOption{kanuri}{kr}{kau}{}{}{}{Latn}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@add@kashmiri}
+%\changes{1.3}{2016-10-07}{new}
+%No default script. Could be Arabic or Devanagari.
+%    \begin{macrocode}
+\TrackLangDeclareLanguageOption{kashmiri}{ks}{kas}{}{}{IN}{}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@add@kazakh}
+%\changes{1.3}{2016-10-07}{new}
+%Default script varies according to region.
+%    \begin{macrocode}
+\TrackLangDeclareLanguageOption{kazakh}{kk}{kaz}{}{}{}{}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@add@khmer}
+%\changes{1.3}{2016-10-07}{new}
+%    \begin{macrocode}
+\TrackLangDeclareLanguageOption{khmer}{km}{khm}{}{}{}{Khmr}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@add@kikuyu}
+%\changes{1.3}{2016-10-07}{new}
+%    \begin{macrocode}
+\TrackLangDeclareLanguageOption{kikuyu}{ki}{kik}{}{}{}{Latn}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@add@kinyarwanda}
+%\changes{1.3}{2016-10-07}{new}
+%    \begin{macrocode}
+\TrackLangDeclareLanguageOption{kinyarwanda}{rw}{kin}{}{}{}{Latn}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@add@kirundi}
+%\changes{1.3}{2016-10-07}{new}
+%    \begin{macrocode}
+\TrackLangDeclareLanguageOption{kirundi}{rn}{run}{}{}{}{Latn}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@add@komi}
+%\changes{1.3}{2016-10-07}{new}
+%    \begin{macrocode}
+\TrackLangDeclareLanguageOption{komi}{kv}{kom}{}{}{RU}{Cyrl}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@add@kongo}
+%\changes{1.3}{2016-10-07}{new}
+%    \begin{macrocode}
+\TrackLangDeclareLanguageOption{kongo}{kg}{kon}{}{}{}{Latn}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@add@korean}
+%\changes{1.3}{2016-10-07}{new}
+%    \begin{macrocode}
+\TrackLangDeclareLanguageOption{korean}{ko}{kor}{}{}{}{Hang}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@add@kurdish}
+%\changes{1.3}{2016-10-07}{new}
+% Script varies according to region.
+%    \begin{macrocode}
+\TrackLangDeclareLanguageOption{kurdish}{ku}{kur}{}{}{}{}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@add@kwanyama}
+%\changes{1.3}{2016-10-07}{new}
+%    \begin{macrocode}
+\TrackLangDeclareLanguageOption{kwanyama}{kj}{kua}{}{}{}{Latn}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@add@kyrgyz}
+%\changes{1.3}{2016-10-07}{new}
+%    \begin{macrocode}
+\TrackLangDeclareLanguageOption{kyrgyz}{ky}{kir}{}{}{}{Cyrl}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@add@lao}
+%    \begin{macrocode}
+\TrackLangDeclareLanguageOption{lao}{lo}{lao}{}{}{}{Laoo}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@add@latin}
+%    \begin{macrocode}
+\TrackLangDeclareLanguageOption{latin}{la}{lat}{}{}{}{Latn}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@add@latvian}
+%    \begin{macrocode}
+\TrackLangDeclareLanguageOption{latvian}{lv}{lav}{}{}{}{Latn}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@add@limburgish}
+%\changes{1.3}{2016-10-07}{new}
+%    \begin{macrocode}
+\TrackLangDeclareLanguageOption{limburgish}{li}{lim}{}{}{}{Latn}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@add@lingala}
+%\changes{1.3}{2016-10-07}{new}
+%    \begin{macrocode}
+\TrackLangDeclareLanguageOption{lingala}{ln}{lin}{}{}{}{Latn}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@add@lithuanian}
+%    \begin{macrocode}
+\TrackLangDeclareLanguageOption{lithuanian}{lt}{lit}{}{}{}{Latn}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@add@lsorbian}
+%    \begin{macrocode}
+\TrackLangDeclareLanguageOption{lsorbian}{}{dsb}{}{}{DE}{Latn}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@add@lubakatanga}
+%\changes{1.3}{2016-10-07}{new}
+%    \begin{macrocode}
+\TrackLangDeclareLanguageOption{lubakatanga}{lu}{lub}{}{}{CD}{Latn}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@add@luxembourgish}
+%\changes{1.3}{2016-10-07}{new}
+%    \begin{macrocode}
+\TrackLangDeclareLanguageOption{luxembourgish}{lb}{ltz}{}{}{}{Latn}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@add@macedonian}
+%\changes{1.3}{2016-10-07}{new}
+%    \begin{macrocode}
+\TrackLangDeclareLanguageOption{macedonian}{mk}{mkd}{mac}{}{}{Cyrl}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@add@magyar}
+%    \begin{macrocode}
+\TrackLangDeclareLanguageOption{magyar}{hu}{hun}{}{}{}{Latn}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@add@malagasy}
+%\changes{1.3}{2016-10-07}{new}
+%    \begin{macrocode}
+\TrackLangDeclareLanguageOption{malagasy}{mg}{mlg}{}{}{}{Latn}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@add@malayalam}
+%    \begin{macrocode}
+\TrackLangDeclareLanguageOption{malayalam}{ml}{mal}{}{}{IN}{Mlym}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@add@maltese}
+%\changes{1.1}{2014-11-21}{new}
+%    \begin{macrocode}
+\TrackLangDeclareLanguageOption{maltese}{mt}{mlt}{}{}{}{Latn}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@add@manx}
+%\changes{1.1}{2014-11-21}{new}
+%    \begin{macrocode}
+\TrackLangDeclareLanguageOption{manx}{gv}{glv}{}{}{IM}{Latn}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@add@maori}
+%\changes{1.3}{2016-10-07}{new}
+%    \begin{macrocode}
+\TrackLangDeclareLanguageOption{maori}{mi}{mri}{mao}{}{NZ}{Latn}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@add@marathi}
+%    \begin{macrocode}
+\TrackLangDeclareLanguageOption{marathi}{mr}{mar}{}{}{IN}{Deva}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@add@marshallese}
+%\changes{1.3}{2016-10-07}{new}
+%    \begin{macrocode}
+\TrackLangDeclareLanguageOption{marshallese}{mh}{mah}{}{}{MH}{Latn}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@add@mongolian}
+%\changes{1.3}{2016-10-07}{new}
+%    \begin{macrocode}
+\TrackLangDeclareLanguageOption{mongolian}{mn}{mon}{}{}{}{Mong}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@add@nauruan}
+%\changes{1.3}{2016-10-07}{new}
+%    \begin{macrocode}
+\TrackLangDeclareLanguageOption{nauruan}{na}{nau}{}{}{NR}{Latn}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@add@navajo}
+%\changes{1.3}{2016-10-07}{new}
+%    \begin{macrocode}
+\TrackLangDeclareLanguageOption{navajo}{nv}{nav}{}{}{US}{Latn}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@add@ndonga}
+%\changes{1.3}{2016-10-07}{new}
+%    \begin{macrocode}
+\TrackLangDeclareLanguageOption{ndonga}{ng}{ndo}{}{}{}{Latn}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@add@nepali}
+%\changes{1.3}{2016-10-07}{new}
+%    \begin{macrocode}
+\TrackLangDeclareLanguageOption{nepali}{ne}{nep}{}{}{}{Deva}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@add@nko}
+%    \begin{macrocode}
+\TrackLangDeclareLanguageOption{nko}{}{nqo}{}{}{}{Nkoo}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@add@northernndebele}
+%\changes{1.3}{2016-10-07}{new}
+%    \begin{macrocode}
+\TrackLangDeclareLanguageOption{northernndebele}{nd}{nde}{}{}{}{Latn}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@add@nynorsk}
+%    \begin{macrocode}
+\TrackLangDeclareLanguageOption{nynorsk}{nn}{nno}{}{}{NO}{Latn}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@add@norsk}
+%    \begin{macrocode}
+\TrackLangDeclareLanguageOption{norsk}{no}{nor}{}{}{}{Latn}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@add@northernsotho}
+%\changes{1.3}{2016-10-07}{new}
+%    \begin{macrocode}
+\TrackLangDeclareLanguageOption{northernsotho}{}{nso}{}{}{}{Latn}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@add@nuosu}
+%\changes{1.3}{2016-10-07}{new}
+%    \begin{macrocode}
+\TrackLangDeclareLanguageOption{nuosu}{ii}{iii}{}{}{CN}{Yiii}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@add@occitan}
+%    \begin{macrocode}
+\TrackLangDeclareLanguageOption{occitan}{oc}{oci}{}{}{}{Latn}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@add@ojibwe}
+%\changes{1.3}{2016-10-07}{new}
+%    \begin{macrocode}
+\TrackLangDeclareLanguageOption{ojibwe}{oj}{oji}{}{}{}{Latn}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@add@oromo}
+%\changes{1.3}{2016-10-07}{new}
+%    \begin{macrocode}
+\TrackLangDeclareLanguageOption{oromo}{om}{orm}{}{}{}{Latn}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@add@oriya}
+%\changes{1.3}{2016-10-07}{new}
+%    \begin{macrocode}
+\TrackLangDeclareLanguageOption{oriya}{or}{ori}{}{}{}{Orya}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@add@ossetian}
+%\changes{1.3}{2016-10-07}{new}
+%    \begin{macrocode}
+\TrackLangDeclareLanguageOption{ossetian}{os}{oss}{}{}{}{Cyrl}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@add@pali}
+%\changes{1.3}{2016-10-07}{new}
+%    \begin{macrocode}
+\TrackLangDeclareLanguageOption{pali}{pi}{pli}{}{}{}{Brah}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@add@pashto}
+%\changes{1.3}{2016-10-07}{new}
+%    \begin{macrocode}
+\TrackLangDeclareLanguageOption{pashto}{ps}{pus}{}{}{}{Arab}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@add@piedmontese}
+%    \begin{macrocode}
+\TrackLangDeclareLanguageOption{piedmontese}{}{}{}{pms}{IT}{Latn}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@add@polish}
+%    \begin{macrocode}
+\TrackLangDeclareLanguageOption{polish}{pl}{pol}{}{}{}{Latn}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@add@portuges}
+%    \begin{macrocode}
+\TrackLangDeclareLanguageOption{portuges}{pt}{por}{}{}{}{Latn}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@add@quechua}
+%\changes{1.3}{2016-10-07}{new}
+%    \begin{macrocode}
+\TrackLangDeclareLanguageOption{quechua}{qu}{que}{}{}{}{Latn}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@add@romanian}
+%    \begin{macrocode}
+\TrackLangDeclareLanguageOption{romanian}{ro}{ron}{rum}{}{}{Latn}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@add@romansh}
+%    \begin{macrocode}
+\TrackLangDeclareLanguageOption{romansh}{rm}{roh}{}{}{CH}{Latn}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@add@russian}
+%    \begin{macrocode}
+\TrackLangDeclareLanguageOption{russian}{ru}{rus}{}{}{}{Cyrl}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@add@samin}
+%    \begin{macrocode}
+\TrackLangDeclareLanguageOption{samin}{se}{sme}{}{}{}{Latn}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@add@sanskrit}
+%    \begin{macrocode}
+\TrackLangDeclareLanguageOption{sanskrit}{sa}{san}{}{}{}{}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@add@samoan}
+%\changes{1.3}{2016-10-07}{new}
+%    \begin{macrocode}
+\TrackLangDeclareLanguageOption{samoan}{sm}{smo}{}{}{}{Latn}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@add@sango}
+%\changes{1.3}{2016-10-07}{new}
+%    \begin{macrocode}
+\TrackLangDeclareLanguageOption{sango}{sg}{sag}{}{}{}{Latn}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@add@sardinian}
+%\changes{1.3}{2016-10-07}{new}
+%    \begin{macrocode}
+\TrackLangDeclareLanguageOption{sardinian}{sc}{srd}{}{}{IT}{Latn}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@add@scottish}
+%Also spoken in Canada, so no region.
+%    \begin{macrocode}
+\TrackLangDeclareLanguageOption{scottish}{gd}{gla}{}{}{}{Latn}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@add@serbian}
+%    \begin{macrocode}
+\TrackLangDeclareLanguageOption{serbian}{sr}{srp}{}{}{}{Cyrl}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@add@shona}
+%\changes{1.3}{2016-10-07}{new}
+%    \begin{macrocode}
+\TrackLangDeclareLanguageOption{shona}{sn}{sna}{}{}{}{Latn}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@add@sindhi}
+%\changes{1.3}{2016-10-07}{new}
+%    \begin{macrocode}
+\TrackLangDeclareLanguageOption{sindhi}{sd}{snd}{}{}{}{Sind}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@add@sinhalese}
+%\changes{1.3}{2016-10-07}{new}
+%    \begin{macrocode}
+\TrackLangDeclareLanguageOption{sinhalese}{si}{sin}{}{}{LK}{Sinh}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@add@slovak}
+%    \begin{macrocode}
+\TrackLangDeclareLanguageOption{slovak}{sk}{slk}{slo}{}{}{Latn}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@add@slovene}
+%    \begin{macrocode}
+\TrackLangDeclareLanguageOption{slovene}{sl}{slv}{}{}{}{Latn}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@add@somali}
+%\changes{1.3}{2016-10-07}{new}
+%    \begin{macrocode}
+\TrackLangDeclareLanguageOption{somali}{so}{som}{}{}{}{Latn}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@add@southernndebele}
+%\changes{1.3}{2016-10-07}{new}
+%    \begin{macrocode}
+\TrackLangDeclareLanguageOption{southernndebele}{nr}{nbl}{}{}{ZA}{Latn}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@add@southernsotho}
+%\changes{1.3}{2016-10-07}{new}
+%    \begin{macrocode}
+\TrackLangDeclareLanguageOption{southernsotho}{st}{sot}{}{}{}{Latn}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@add@spanish}
+%    \begin{macrocode}
+\TrackLangDeclareLanguageOption{spanish}{es}{spa}{}{}{}{Latn}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@add@sudanese}
+%\changes{1.3}{2016-10-07}{new}
+%    \begin{macrocode}
+\TrackLangDeclareLanguageOption{sudanese}{su}{sun}{}{}{}{Sund}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@add@swahili}
+%\changes{1.3}{2016-10-07}{new}
+%    \begin{macrocode}
+\TrackLangDeclareLanguageOption{swahili}{sw}{swa}{}{}{}{}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@add@swati}
+%\changes{1.3}{2016-10-07}{new}
+%    \begin{macrocode}
+\TrackLangDeclareLanguageOption{swati}{ss}{ssw}{}{}{}{Latn}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@add@swedish}
+%    \begin{macrocode}
+\TrackLangDeclareLanguageOption{swedish}{sv}{swe}{}{}{}{Latn}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@add@syriac}
+%    \begin{macrocode}
+\TrackLangDeclareLanguageOption{syriac}{}{syr}{}{}{}{Syrc}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@add@tagalog}
+%\changes{1.3}{2016-10-07}{new}
+%    \begin{macrocode}
+\TrackLangDeclareLanguageOption{tagalog}{tl}{tgl}{}{}{PH}{Latn}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@add@tahitian}
+%\changes{1.3}{2016-10-07}{new}
+%    \begin{macrocode}
+\TrackLangDeclareLanguageOption{tahitian}{ty}{tah}{}{}{PF}{Latn}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@add@tai}
+%    \begin{macrocode}
+\TrackLangDeclareLanguageOption{tai}{}{tai}{}{}{}{}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@add@tajik}
+%\changes{1.3}{2016-10-07}{new}
+%    \begin{macrocode}
+\TrackLangDeclareLanguageOption{tajik}{tg}{tgk}{}{}{}{Cyrl}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@add@tamil}
+%    \begin{macrocode}
+\TrackLangDeclareLanguageOption{tamil}{ta}{tam}{}{}{}{Taml}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@add@tatar}
+%\changes{1.3}{2016-10-07}{new}
+%    \begin{macrocode}
+\TrackLangDeclareLanguageOption{tatar}{tt}{tat}{}{}{}{Cyrl}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@add@telugu}
+%    \begin{macrocode}
+\TrackLangDeclareLanguageOption{telugu}{te}{tel}{}{}{IN}{Telu}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@add@thai}
+%    \begin{macrocode}
+\TrackLangDeclareLanguageOption{thai}{th}{tha}{}{}{TH}{Thai}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@add@tibetan}
+%    \begin{macrocode}
+\TrackLangDeclareLanguageOption{tibetan}{bo}{bod}{tib}{}{}{Tibt}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@add@tigrinya}
+%\changes{1.3}{2016-10-07}{new}
+%    \begin{macrocode}
+\TrackLangDeclareLanguageOption{tigrinya}{ti}{tir}{}{}{}{Ethi}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@add@tonga}
+%\changes{1.3}{2016-10-07}{new}
+%    \begin{macrocode}
+\TrackLangDeclareLanguageOption{tonga}{to}{ton}{}{}{TO}{Latn}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@add@tsonga}
+%\changes{1.3}{2016-10-07}{new}
+%    \begin{macrocode}
+\TrackLangDeclareLanguageOption{tsonga}{ts}{tso}{}{}{}{Latn}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@add@tswana}
+%\changes{1.3}{2016-10-07}{new}
+%    \begin{macrocode}
+\TrackLangDeclareLanguageOption{tswana}{tn}{tsn}{}{}{}{Latn}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@add@turkish}
+%    \begin{macrocode}
+\TrackLangDeclareLanguageOption{turkish}{tr}{tur}{}{}{}{Latn}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@add@turkmen}
+%    \begin{macrocode}
+\TrackLangDeclareLanguageOption{turkmen}{tk}{tuk}{}{}{}{Latn}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@add@twi}
+%\changes{1.3}{2016-10-07}{new}
+%    \begin{macrocode}
+\TrackLangDeclareLanguageOption{twi}{tw}{twi}{}{}{GH}{Latn}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@add@ukrainian}
+%    \begin{macrocode}
+\TrackLangDeclareLanguageOption{ukrainian}{uk}{ukr}{}{}{UA}{Cyrl}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@add@urdu}
+%    \begin{macrocode}
+\TrackLangDeclareLanguageOption{urdu}{ur}{urd}{}{}{}{Arab}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@add@usorbian}
+%\changes{1.3}{2016-10-07}{corrected ISO 639-1 code}
+%    \begin{macrocode}
+\TrackLangDeclareLanguageOption{usorbian}{}{hsb}{}{}{DE}{Latn}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@add@uyghur}
+%\changes{1.3}{2016-10-07}{new}
+%    \begin{macrocode}
+\TrackLangDeclareLanguageOption{uyghur}{ug}{uig}{}{}{CN}{Arab}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@add@uzbek}
+%\changes{1.3}{2016-10-07}{new}
+%    \begin{macrocode}
+\TrackLangDeclareLanguageOption{uzbek}{uz}{uzb}{}{}{}{Latn}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@add@venda}
+%\changes{1.3}{2016-10-07}{new}
+%    \begin{macrocode}
+\TrackLangDeclareLanguageOption{venda}{ve}{ven}{}{}{ZA}{Latn}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@add@vietnamese}
+%    \begin{macrocode}
+\TrackLangDeclareLanguageOption{vietnamese}{vi}{vie}{}{}{}{Latn}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@add@volapuk}
+%\changes{1.3}{2016-10-07}{new}
+%    \begin{macrocode}
+\TrackLangDeclareLanguageOption{volapuk}{vo}{vol}{}{}{}{Latn}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@add@walloon}
+% No country code as Walloon is spoken in multiple regions
+% (Wallonia in Belgium, some villages in Northern France and north-east of
+% Wisconsin.) Not the same as Belgian French.
+%    \begin{macrocode}
+\TrackLangDeclareLanguageOption{walloon}{wa}{wln}{}{}{}{Latn}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@add@welsh}
+%Also spoken in Argentina, so no region.
+%    \begin{macrocode}
+\TrackLangDeclareLanguageOption{welsh}{cy}{cym}{wel}{}{}{Latn}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@add@westernfrisian}
+%\changes{1.3}{2016-10-07}{new}
+%    \begin{macrocode}
+\TrackLangDeclareLanguageOption{westernfrisian}{fy}{fry}{}{}{NL}{Latn}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@add@wolof}
+%\changes{1.3}{2016-10-07}{new}
+%    \begin{macrocode}
+\TrackLangDeclareLanguageOption{wolof}{wo}{wol}{}{}{}{Latn}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@add@xhosa}
+%\changes{1.3}{2016-10-07}{new}
+%    \begin{macrocode}
+\TrackLangDeclareLanguageOption{xhosa}{xh}{xho}{}{}{}{Latn}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@add@yiddish}
+%\changes{1.3}{2016-10-07}{new}
+%    \begin{macrocode}
+\TrackLangDeclareLanguageOption{yiddish}{yi}{yid}{}{}{}{Hebr}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@add@yoruba}
+%\changes{1.3}{2016-10-07}{new}
+%    \begin{macrocode}
+\TrackLangDeclareLanguageOption{yoruba}{yo}{yor}{}{}{}{Latn}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@add@zhuang}
+%\changes{1.3}{2016-10-07}{new}
+%    \begin{macrocode}
+\TrackLangDeclareLanguageOption{zhuang}{za}{zha}{}{}{CN}{Hani}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@add@zulu}
+%\changes{1.3}{2016-10-07}{new}
+%    \begin{macrocode}
+\TrackLangDeclareLanguageOption{zulu}{zu}{zul}{}{}{}{Latn}
+%    \end{macrocode}
+%\end{macro}
+%
+%
+%\subsection{Predefined Dialects}\label{sec:predefined}
+%
+% Provide some predefined dialects.
+%\begin{macro}{\TrackLangDeclareDialectOption}
+%\changes{1.3}{2016-10-07}{new}
+%\begin{definition}
+%\cs{TrackLangDeclareDialectOption}\marg{dialect}\marg{root
+%language}\marg{3166-1
+%code}\marg{modifier}\marg{variant}\marg{map}\marg{script}
+%\end{definition}
+%The option name is the same as the dialect name. The arguments
+%must be expanded before use. The final argument \meta{map} is the
+%mapping from \meta{dialect} to the closest \styfmt{babel} dialect
+%label. May be empty if no relevant mapping.
+%    \begin{macrocode}
+\def\TrackLangDeclareDialectOption#1#2#3#4#5#6#7{%
+  \@tracklang@ifundef{@tracklang@add@#1}%
+  {%
+    \ifx\relax#3\relax
+%    \end{macrocode}
+% No region.
+%    \begin{macrocode}
+     \ifx\relax#4\relax
+%    \end{macrocode}
+% No modifier.
+%    \begin{macrocode}
+      \ifx\relax#5\relax
+%    \end{macrocode}
+% No variant.
+%    \begin{macrocode}
+        \@tracklang@namedef{@tracklang@add@#1}{%
+          \AddTrackedDialect{#1}{#2}%
+          \AddTrackedLanguageIsoCodes{#2}%
+%    \end{macrocode}
+% Make it easier for the parser to pick up the dialect label.
+% Note that this should be the same as
+% \cs{TrackLangLastTrackedDialect} but the parser references
+% \cs{@tracklang@dialect}.
+%    \begin{macrocode}
+          \def\@tracklang@dialect{#1}%
+        }%
+      \else
+%    \end{macrocode}
+% Has variant but no modifier.
+%    \begin{macrocode}
+        \@tracklang@namedef{@tracklang@add@#1}{%
+          \AddTrackedDialect{#1}{#2}%
+          \AddTrackedLanguageIsoCodes{#2}%
+          \SetTrackedDialectVariant{#1}{#5}%
+          \def\@tracklang@dialect{#1}%
+        }%
+      \fi
+     \else
+%    \end{macrocode}
+% Has modifier.
+%    \begin{macrocode}
+       \ifx\relax#5\relax
+%    \end{macrocode}
+% No variant.
+%    \begin{macrocode}
+         \@tracklang@namedef{@tracklang@add@#1}{%
+           \AddTrackedDialect{#1}{#2}%
+           \AddTrackedLanguageIsoCodes{#2}%
+           \SetTrackedDialectModifier{#1}{#4}%
+           \def\@tracklang@dialect{#1}%
+         }%
+       \else
+%    \end{macrocode}
+% Variant and modifier.
+%    \begin{macrocode}
+         \@tracklang@namedef{@tracklang@add@#1}{%
+           \AddTrackedDialect{#1}{#2}%
+           \AddTrackedLanguageIsoCodes{#2}%
+           \SetTrackedDialectModifier{#1}{#4}%
+           \SetTrackedDialectVariant{#1}{#5}%
+           \def\@tracklang@dialect{#1}%
+         }%
+       \fi
+     \fi
+    \else
+%    \end{macrocode}
+% Has a region.
+%    \begin{macrocode}
+     \ifx\relax#4\relax
+%    \end{macrocode}
+% No modifier.
+%    \begin{macrocode}
+       \ifx\relax#5\relax
+%    \end{macrocode}
+% No variant.
+%    \begin{macrocode}
+          \@tracklang@namedef{@tracklang@add@#1}{%
+            \AddTrackedDialect{#1}{#2}%
+            \AddTrackedLanguageIsoCodes{#2}%
+            \AddTrackedIsoLanguage{3166-1}{#3}{#1}%
+            \def\@tracklang@dialect{#1}%
+          }%
+       \else
+%    \end{macrocode}
+% Variant no modifier.
+%    \begin{macrocode}
+          \@tracklang@namedef{@tracklang@add@#1}{%
+            \AddTrackedDialect{#1}{#2}%
+            \AddTrackedLanguageIsoCodes{#2}%
+            \AddTrackedIsoLanguage{3166-1}{#3}{#1}%
+            \SetTrackedDialectVariant{#1}{#5}%
+            \def\@tracklang@dialect{#1}%
+          }%
+       \fi
+     \else
+%    \end{macrocode}
+% Has modifier.
+%    \begin{macrocode}
+       \ifx\relax#5\relax
+%    \end{macrocode}
+% No variant.
+%    \begin{macrocode}
+          \@tracklang@namedef{@tracklang@add@#1}{%
+            \AddTrackedDialect{#1}{#2}%
+            \AddTrackedLanguageIsoCodes{#2}%
+            \AddTrackedIsoLanguage{3166-1}{#3}{#1}%
+            \SetTrackedDialectModifier{#1}{#4}%
+            \def\@tracklang@dialect{#1}%
+          }%
+       \else
+%    \end{macrocode}
+% Variant and modifier.
+%    \begin{macrocode}
+          \@tracklang@namedef{@tracklang@add@#1}{%
+            \AddTrackedDialect{#1}{#2}%
+            \AddTrackedLanguageIsoCodes{#2}%
+            \AddTrackedIsoLanguage{3166-1}{#3}{#1}%
+            \SetTrackedDialectModifier{#1}{#4}%
+            \SetTrackedDialectVariant{#1}{#5}%
+            \def\@tracklang@dialect{#1}%
+          }%
+       \fi
+     \fi
+    \fi
+%    \end{macrocode}
+% Add the mapping if provided.
+%    \begin{macrocode}
+    \ifx\relax#6\relax
+    \else
+      \expandafter
+       \let\expandafter\@tracklang@tmp\csname @tracklang@add@#1\endcsname
+      \expandafter\def\csname @tracklang@add@#1\expandafter\endcsname
+%    \end{macrocode}
+%\changes{1.3.3}{2016-11-03}{fixed mapping order}
+%    \begin{macrocode}
+        \expandafter{\@tracklang@tmp\SetTrackedDialectLabelMap{#1}{#6}}%
+    \fi
+%    \end{macrocode}
+% Add the script if provided.
+%    \begin{macrocode}
+    \ifx\relax#7\relax
+    \else
+      \expandafter
+       \let\expandafter\@tracklang@tmp\csname @tracklang@add@#1\endcsname
+      \expandafter\def\csname @tracklang@add@#1\expandafter\endcsname
+        \expandafter{\@tracklang@tmp\SetTrackedDialectScript{#1}{#7}}%
+    \fi
+    \@tracklang@declareoption{#1}%
+  }%
+  {%
+    \@tracklang@err{dialect option `#1' has already been defined}{}%
+  }%
+}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@add@acadian}
+%    \begin{macrocode}
+\TrackLangDeclareDialectOption{acadian}{french}{}{}{}{}{}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@add@american}
+%    \begin{macrocode}
+\TrackLangDeclareDialectOption{american}{english}{US}{}{}{}{}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@add@australian}
+%    \begin{macrocode}
+\TrackLangDeclareDialectOption{australian}{english}{AU}{}{}{}{}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@add@austrian}
+%    \begin{macrocode}
+\TrackLangDeclareDialectOption{austrian}{german}{AT}{}{}{}{}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@add@naustrian}
+%\changes{1.3}{2016-10-07}{added modifier}
+%    \begin{macrocode}
+\TrackLangDeclareDialectOption{naustrian}{german}{AT}{new}{1996}{}{}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@add@bahasa}
+%    \begin{macrocode}
+\TrackLangDeclareDialectOption{bahasa}{bahasai}{IN}{}{}{}{}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@add@brazil}
+%    \begin{macrocode}
+\TrackLangDeclareDialectOption{brazil}{portuges}{BR}{}{}{}{}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@add@brazilian}
+%    \begin{macrocode}
+\TrackLangDeclareDialectOption{brazilian}{portuges}{BR}{}{}{}{}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@add@british}
+%    \begin{macrocode}
+\TrackLangDeclareDialectOption{british}{english}{GB}{}{}{}{}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@add@canadian}
+%    \begin{macrocode}
+\TrackLangDeclareDialectOption{canadian}{english}{CA}{}{}{}{}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@add@canadien}
+%    \begin{macrocode}
+\TrackLangDeclareDialectOption{canadien}{french}{CA}{}{}{}{}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@add@croatia}
+%    \begin{macrocode}
+\TrackLangDeclareDialectOption{croatia}{croatian}{HR}{}{}{}{}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@add@istriacountycroatian}
+%    \begin{macrocode}
+\TrackLangDeclareDialectOption{istriacountycroatian}{croatian}{HR}{}{}{}{}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@add@istriacountyitalian}
+%    \begin{macrocode}
+\TrackLangDeclareDialectOption{istriacountyitalian}{italian}{HR}{}{}{}{}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@add@netherlands}
+%\changes{1.1}{2014-11-21}{new}
+%    \begin{macrocode}
+\TrackLangDeclareDialectOption{netherlands}{dutch}{NL}{}{}{}{}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@add@persian}
+%    \begin{macrocode}
+\TrackLangDeclareDialectOption{persian}{farsi}{}{}{}{}{}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@add@flemish}
+%    \begin{macrocode}
+\TrackLangDeclareDialectOption{flemish}{dutch}{BE}{}{}{}{}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@add@francais}
+%    \begin{macrocode}
+\TrackLangDeclareDialectOption{francais}{french}{}{}{}{}{}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@add@frenchb}
+%    \begin{macrocode}
+\TrackLangDeclareDialectOption{frenchb}{french}{}{}{}{}{}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@add@france}
+%\changes{1.1}{2014-11-21}{new}
+%    \begin{macrocode}
+\TrackLangDeclareDialectOption{france}{french}{FR}{}{}{}{}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@add@belgique}
+%    \begin{macrocode}
+\TrackLangDeclareDialectOption{belgique}{french}{BE}{}{}{}{}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@add@belgiangerman}
+%    \begin{macrocode}
+\TrackLangDeclareDialectOption{belgiangerman}{german}{BE}{}{}{}{}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@add@nbelgiangerman}
+%\changes{1.3}{2016-10-07}{new}
+%    \begin{macrocode}
+\TrackLangDeclareDialectOption{nbelgiangerman}{german}{BE}{new}{1996}{ngerman}{}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@add@friulian}
+%    \begin{macrocode}
+\TrackLangDeclareDialectOption{friulian}{friulan}{IT}{}{}{}{}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@add@friulano}
+%    \begin{macrocode}
+\TrackLangDeclareDialectOption{friulano}{friulan}{IT}{}{}{}{}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@add@furlan}
+%\changes{1.3.4}{2017-03-25}{new}
+%Added since it's a babel alias for friulan.
+%    \begin{macrocode}
+\TrackLangDeclareDialectOption{furlan}{friulan}{IT}{}{}{}{}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@add@kurmanji}
+%\changes{1.3.4}{2017-03-25}{new}
+%Added since it's a babel label.
+%    \begin{macrocode}
+\TrackLangDeclareDialectOption{kurmanji}{kurdish}{}{}{}{}{}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@add@galicien}
+%    \begin{macrocode}
+\TrackLangDeclareDialectOption{galicien}{galician}{}{}{}{}{}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@add@deutsch}
+%    \begin{macrocode}
+\TrackLangDeclareDialectOption{deutsch}{german}{}{}{}{}{}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@add@ngerman}
+%\changes{1.3}{2016-10-07}{added modifier}
+%    \begin{macrocode}
+\TrackLangDeclareDialectOption{ngerman}{german}{}{new}{1996}{}{}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@add@ngermanb}
+%\changes{1.3}{2016-10-07}{new}
+%    \begin{macrocode}
+\TrackLangDeclareDialectOption{ngermanb}{german}{}{new}{1996}{ngerman}{}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@add@germanb}
+%\changes{1.3}{2016-10-07}{new}
+%    \begin{macrocode}
+\TrackLangDeclareDialectOption{germanb}{german}{}{}{}{}{}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@add@ngermanDE}
+%\changes{1.1}{2014-11-21}{new}
+%\changes{1.3}{2016-10-07}{added modifier}
+%    \begin{macrocode}
+\TrackLangDeclareDialectOption{ngermanDE}{german}{DE}{new}{1996}{ngerman}{}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@add@germanDE}
+%\changes{1.3}{2016-10-07}{new}
+%    \begin{macrocode}
+\TrackLangDeclareDialectOption{germanDE}{german}{DE}{}{}{}{}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@add@hungarian}
+%    \begin{macrocode}
+\TrackLangDeclareDialectOption{hungarian}{magyar}{HU}{}{}{}{}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@add@indon}
+%    \begin{macrocode}
+\TrackLangDeclareDialectOption{indon}{bahasai}{IN}{}{}{}{}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@add@indonesian}
+%    \begin{macrocode}
+\TrackLangDeclareDialectOption{indonesian}{bahasai}{IN}{}{}{}{}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@add@gaeilge}
+%    \begin{macrocode}
+\TrackLangDeclareDialectOption{gaeilge}{irish}{}{}{}{}{}
+%    \end{macrocode}
+%\end{macro}
+%\begin{macro}{\@tracklang@add@IEirish}
+%\changes{1.2}{2015-03-23}{new}
+% Irish spoken in Republic of Ireland
+%    \begin{macrocode}
+\TrackLangDeclareDialectOption{IEirish}{irish}{IE}{}{}{}{}
+%    \end{macrocode}
+%\end{macro}
+%\begin{macro}{\@tracklang@add@GBirish}
+%\changes{1.2}{2015-03-23}{new}
+% Irish spoken in the United Kingdom of Great Britain and Northern Ireland
+%    \begin{macrocode}
+\TrackLangDeclareDialectOption{GBirish}{irish}{GB}{}{}{}{}
+%    \end{macrocode}
+%\end{macro}
+%\begin{macro}{\@tracklang@add@IEenglish}
+%\changes{1.2}{2015-03-23}{new}
+%English spoken in the Republic of Ireland.
+%    \begin{macrocode}
+\TrackLangDeclareDialectOption{IEenglish}{english}{IE}{}{}{british}{}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@add@italy}
+%    \begin{macrocode}
+\TrackLangDeclareDialectOption{italy}{italian}{IT}{}{}{}{}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@add@vatican}
+%    \begin{macrocode}
+\TrackLangDeclareDialectOption{vatican}{italian}{VA}{}{}{}{}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@add@sanmarino}
+%    \begin{macrocode}
+\TrackLangDeclareDialectOption{sanmarino}{italian}{SM}{}{}{}{}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@add@sloveneistriaitalian}
+%    \begin{macrocode}
+\TrackLangDeclareDialectOption{sloveneistriaitalian}{italian}{SI}{}{}{}{}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@add@jerseyenglish}
+%\changes{1.1}{2014-11-21}{new}
+%Allow it to hook to pick up \cs{captionsbritish} as well as
+%\cs{captionsenglish} since the date format closely matches
+%\texttt{british}.
+%    \begin{macrocode}
+\TrackLangDeclareDialectOption{jerseyenglish}{english}{JE}{}{}{british}{}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@add@jerseyfrench}
+%\changes{1.1}{2014-11-21}{new}
+%    \begin{macrocode}
+\TrackLangDeclareDialectOption{jerseyfrench}{french}{JE}{}{}{}{}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@add@guernseyenglish}
+%\changes{1.1}{2014-11-21}{new}
+%Allow it to hook to pick up \cs{captionsbritish} as well as
+%\cs{captionsenglish} since the date format closely matches
+%\texttt{british}.
+%    \begin{macrocode}
+\TrackLangDeclareDialectOption{guernseyenglish}{english}{GG}{}{}{british}{}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@add@guernseyfrench}
+%\changes{1.1}{2014-11-21}{new}
+%    \begin{macrocode}
+\TrackLangDeclareDialectOption{guernseyfrench}{french}{GG}{}{}{}{}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@add@latein}
+%    \begin{macrocode}
+\TrackLangDeclareDialectOption{latein}{latin}{}{}{}{}{}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@add@lowersorbian}
+%    \begin{macrocode}
+\TrackLangDeclareDialectOption{lowersorbian}{lsorbian}{DE}{}{}{}{}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@add@malay}
+%    \begin{macrocode}
+\TrackLangDeclareDialectOption{malay}{bahasam}{MY}{}{}{}{}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@add@meyalu}
+%    \begin{macrocode}
+\TrackLangDeclareDialectOption{meyalu}{bahasam}{MY}{}{}{}{}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@add@maltamaltese}
+%\changes{1.1}{2014-11-21}{new}
+%    \begin{macrocode}
+\TrackLangDeclareDialectOption{maltamaltese}{maltese}{MT}{}{}{}{}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@add@maltaenglish}
+%\changes{1.1}{2014-11-21}{new}
+%Allow it to hook to pick up \cs{captionsbritish} as well as
+%\cs{captionsenglish} since the date format closely matches
+%\texttt{british}.
+%    \begin{macrocode}
+\TrackLangDeclareDialectOption{maltaenglish}{english}{MT}{}{}{british}{}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@add@newzealand}
+%    \begin{macrocode}
+\TrackLangDeclareDialectOption{newzealand}{english}{NZ}{}{}{}{}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@add@isleofmanenglish}
+%\changes{1.1}{2014-11-21}{new}
+%Allow it to hook to pick up \cs{captionsbritish} as well as
+%\cs{captionsenglish} since the date format closely matches
+%\texttt{british}.
+%    \begin{macrocode}
+\TrackLangDeclareDialectOption{isleofmanenglish}{english}{IM}{}{}{british}{}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@add@norwegian}
+%    \begin{macrocode}
+\TrackLangDeclareDialectOption{norwegian}{norsk}{NO}{}{}{}{}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@add@piemonteis}
+%    \begin{macrocode}
+\TrackLangDeclareDialectOption{piemonteis}{piedmontese}{IT}{}{}{}{}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@add@polutonikogreek}
+%\changes{1.3}{2016-10-07}{added modifier}
+%    \begin{macrocode}
+\TrackLangDeclareDialectOption{polutonikogreek}{greek}{}{polyton}{}{}{}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@add@polutoniko}
+%\changes{1.3}{2016-10-07}{added modifier}
+%    \begin{macrocode}
+\TrackLangDeclareDialectOption{polutoniko}{greek}{}{polyton}{}{}{}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@add@portuguese}
+%    \begin{macrocode}
+\TrackLangDeclareDialectOption{portuguese}{portuges}{}{}{}{}{}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@add@portugal}
+%\changes{1.1}{2014-11-21}{new}
+%    \begin{macrocode}
+\TrackLangDeclareDialectOption{portugal}{portuges}{PT}{}{}{}{}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@add@romansch}
+%    \begin{macrocode}
+\TrackLangDeclareDialectOption{romansch}{romansh}{}{}{}{}{}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@add@rumantsch}
+%    \begin{macrocode}
+\TrackLangDeclareDialectOption{rumantsch}{romansh}{}{}{}{}{}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@add@romanche}
+%    \begin{macrocode}
+\TrackLangDeclareDialectOption{romanche}{romansh}{}{}{}{}{}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@add@russianb}
+%    \begin{macrocode}
+\TrackLangDeclareDialectOption{russianb}{russian}{}{}{}{}{}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@add@gaelic}
+%    \begin{macrocode}
+\TrackLangDeclareDialectOption{gaelic}{scottish}{}{}{}{}{}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@add@GBscottish}
+%\changes{1.3}{2016-10-07}{new}
+%    \begin{macrocode}
+\TrackLangDeclareDialectOption{GBscottish}{scottish}{GB}{}{}{}{}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@add@serbianc}
+%\changes{1.3}{2016-10-07}{new}
+%    \begin{macrocode}
+\TrackLangDeclareDialectOption{serbianc}{serbian}{}{}{}{}{Cyrl}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@add@serbianl}
+%\changes{1.3}{2016-10-07}{new}
+%    \begin{macrocode}
+\TrackLangDeclareDialectOption{serbianl}{serbian}{}{}{}{}{Latn}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@add@slovenian}
+%    \begin{macrocode}
+\TrackLangDeclareDialectOption{slovenian}{slovene}{}{}{}{}{}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@add@slovenia}
+%    \begin{macrocode}
+\TrackLangDeclareDialectOption{slovenia}{slovene}{SI}{}{}{slovenian}{}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@add@sloveneistriaslovenian}
+%\changes{1.3}{2016-10-07}{fixed root language name}
+%    \begin{macrocode}
+\TrackLangDeclareDialectOption{sloveneistriaslovenian}{slovene}{SI}{}{}{slovenian}{}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@add@spainspanish}
+%\changes{1.1}{2014-11-21}{new}
+%    \begin{macrocode}
+\TrackLangDeclareDialectOption{spainspanish}{spanish}{ES}{}{}{}{}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@add@argentinespanish}
+%\changes{1.1}{2014-11-21}{new}
+%    \begin{macrocode}
+\TrackLangDeclareDialectOption{argentinespanish}{spanish}{AR}{}{}{}{}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@add@bolivianspanish}
+%\changes{1.1}{2014-11-21}{new}
+%    \begin{macrocode}
+\TrackLangDeclareDialectOption{bolivianspanish}{spanish}{BO}{}{}{}{}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@add@chilianspanish}
+%\changes{1.1}{2014-11-21}{new}
+%    \begin{macrocode}
+\TrackLangDeclareDialectOption{chilianspanish}{spanish}{CL}{}{}{}{}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@add@columbianspanish}
+%\changes{1.1}{2014-11-21}{new}
+%    \begin{macrocode}
+\TrackLangDeclareDialectOption{columbianspanish}{spanish}{CO}{}{}{}{}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@add@costaricanspanish}
+%\changes{1.1}{2014-11-21}{new}
+%    \begin{macrocode}
+\TrackLangDeclareDialectOption{costaricanspanish}{spanish}{CR}{}{}{}{}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@add@cubanspanish}
+%\changes{1.1}{2014-11-21}{new}
+%    \begin{macrocode}
+\TrackLangDeclareDialectOption{cubanspanish}{spanish}{CU}{}{}{}{}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@add@dominicanspanish}
+%\changes{1.1}{2014-11-21}{new}
+%    \begin{macrocode}
+\TrackLangDeclareDialectOption{dominicanspanish}{spanish}{DO}{}{}{}{}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@add@ecudorianspanish}
+%\changes{1.1}{2014-11-21}{new}
+%    \begin{macrocode}
+\TrackLangDeclareDialectOption{ecudorianspanish}{spanish}{EC}{}{}{}{}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@add@elsalvadorspanish}
+%\changes{1.1}{2014-11-21}{new}
+%    \begin{macrocode}
+\TrackLangDeclareDialectOption{elsalvadorspanish}{spanish}{SV}{}{}{}{}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@add@guatemalanspanish}
+%\changes{1.1}{2014-11-21}{new}
+%    \begin{macrocode}
+\TrackLangDeclareDialectOption{guatemalanspanish}{spanish}{GT}{}{}{}{}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@add@honduranspanish}
+%\changes{1.1}{2014-11-21}{new}
+%    \begin{macrocode}
+\TrackLangDeclareDialectOption{honduranspanish}{spanish}{HN}{}{}{}{}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@add@mexicanspanish}
+%\changes{1.1}{2014-11-21}{new}
+%    \begin{macrocode}
+\TrackLangDeclareDialectOption{mexicanspanish}{spanish}{MX}{}{}{}{}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@add@nicaraguanspanish}
+%\changes{1.1}{2014-11-21}{new}
+%    \begin{macrocode}
+\TrackLangDeclareDialectOption{nicaraguanspanish}{spanish}{NI}{}{}{}{}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@add@panamaspanish}
+%\changes{1.1}{2014-11-21}{new}
+%    \begin{macrocode}
+\TrackLangDeclareDialectOption{panamaspanish}{spanish}{PA}{}{}{}{}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@add@paraguayspanish}
+%\changes{1.1}{2014-11-21}{new}
+%    \begin{macrocode}
+\TrackLangDeclareDialectOption{paraguayspanish}{spanish}{PY}{}{}{}{}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@add@peruvianspanish}
+%\changes{1.1}{2014-11-21}{new}
+%    \begin{macrocode}
+\TrackLangDeclareDialectOption{peruvianspanish}{spanish}{PE}{}{}{}{}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@add@puertoricospanish}
+%\changes{1.1}{2014-11-21}{new}
+%    \begin{macrocode}
+\TrackLangDeclareDialectOption{puertoricospanish}{spanish}{PR}{}{}{}{}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@add@uruguayspanish}
+%\changes{1.1}{2014-11-21}{new}
+%    \begin{macrocode}
+\TrackLangDeclareDialectOption{uruguayspanish}{spanish}{UY}{}{}{}{}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@add@venezuelanspanish}
+%\changes{1.1}{2014-11-21}{new}
+%    \begin{macrocode}
+\TrackLangDeclareDialectOption{venezuelanspanish}{spanish}{VE}{}{}{}{}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@add@swissgerman}
+%\changes{1.1}{2014-11-21}{new}
+%    \begin{macrocode}
+\TrackLangDeclareDialectOption{swissgerman}{german}{CH}{}{}{}{}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@add@nswissgerman}
+%\changes{1.3}{2016-10-07}{new}
+%    \begin{macrocode}
+\TrackLangDeclareDialectOption{nswissgerman}{german}{CH}{new}{1996}{ngerman}{}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@add@swissfrench}
+%\changes{1.1}{2014-11-21}{new}
+%    \begin{macrocode}
+\TrackLangDeclareDialectOption{swissfrench}{french}{CH}{}{}{}{}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@add@swissitalian}
+%\changes{1.1}{2014-11-21}{new}
+%    \begin{macrocode}
+\TrackLangDeclareDialectOption{swissitalian}{italian}{CH}{}{}{}{}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@add@swissromansh}
+%\changes{1.1}{2014-11-21}{new}
+%    \begin{macrocode}
+\TrackLangDeclareDialectOption{swissromansh}{romansh}{CH}{}{}{}{}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@add@UKenglish}
+%    \begin{macrocode}
+\TrackLangDeclareDialectOption{UKenglish}{english}{GB}{}{}{}{}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@add@ukraineb}
+%    \begin{macrocode}
+\TrackLangDeclareDialectOption{ukraineb}{ukrainian}{UA}{}{}{}{}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@add@ukraine}
+%    \begin{macrocode}
+\TrackLangDeclareDialectOption{ukraine}{ukrainian}{UA}{}{}{}{}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@add@uppersorbian}
+%    \begin{macrocode}
+\TrackLangDeclareDialectOption{uppersorbian}{usorbian}{DE}{}{}{}{}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@add@USenglish}
+%    \begin{macrocode}
+\TrackLangDeclareDialectOption{USenglish}{english}{US}{}{}{}{}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@add@valencian}
+%    \begin{macrocode}
+\TrackLangDeclareDialectOption{valencian}{catalan}{}{}{}{}{}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@add@valencien}
+%    \begin{macrocode}
+\TrackLangDeclareDialectOption{valencien}{catalan}{}{}{}{}{}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@add@cymraeg}
+%    \begin{macrocode}
+\TrackLangDeclareDialectOption{cymraeg}{welsh}{}{}{}{}{}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@add@GBwelsh}
+%\changes{1.3}{2016-10-07}{new}
+%    \begin{macrocode}
+\TrackLangDeclareDialectOption{GBwelsh}{welsh}{GB}{}{}{}{}
+%    \end{macrocode}
+%\end{macro}
+%
+%\subsection{Dialect Option Synonyms}
+%\label{sec:dialectsyns}
+% Add some dialect synonyms:
+%\begin{macro}{\LetTrackLangSynonym}
+%\changes{1.3}{2016-10-07}{new}
+%    \begin{macrocode}
+\def\LetTrackLangSynonym#1#2{%
+  \expandafter\let\csname @tracklang@add@#1\expandafter\endcsname
+    \csname @tracklang@add@#2\endcsname
+}
+%    \end{macrocode}
+%\end{macro}
+%\begin{macro}{\LetTrackLangOption}
+%\changes{1.1}{2014-11-21}{new}
+%    \begin{macrocode}
+\def\LetTrackLangOption#1#2{%
+  \LetTrackLangSynonym{#1}{#2}%
+  \@tracklang@declareoption{#1}%
+}
+%    \end{macrocode}
+%\end{macro}
+%\begin{macro}{\@tracklang@add@en-US}
+%\changes{1.1}{2014-11-21}{new}
+%    \begin{macrocode}
+\LetTrackLangOption{en-US}{american}
+%    \end{macrocode}
+%\end{macro}
+%\begin{macro}{\@tracklang@add@en-GB}
+%\changes{1.1}{2014-11-21}{new}
+%    \begin{macrocode}
+\LetTrackLangOption{en-GB}{british}
+%    \end{macrocode}
+%\end{macro}
+%\begin{macro}{\@tracklang@add@en-AU}
+%\changes{1.1}{2014-11-21}{new}
+%    \begin{macrocode}
+\LetTrackLangOption{en-AU}{australian}
+%    \end{macrocode}
+%\end{macro}
+%\begin{macro}{\@tracklang@add@en-NZ}
+%\changes{1.1}{2014-11-21}{new}
+%    \begin{macrocode}
+\LetTrackLangOption{en-NZ}{newzealand}
+%    \end{macrocode}
+%\end{macro}
+%\begin{macro}{\@tracklang@add@en-CA}
+%\changes{1.1}{2014-11-21}{new}
+%    \begin{macrocode}
+\LetTrackLangOption{en-CA}{canadian}
+%    \end{macrocode}
+%\end{macro}
+%\begin{macro}{\@tracklang@add@fr-CA}
+%\changes{1.1}{2014-11-21}{new}
+%    \begin{macrocode}
+\LetTrackLangOption{fr-CA}{canadien}
+%    \end{macrocode}
+%\end{macro}
+%\begin{macro}{\@tracklang@add@fr-BE}
+%\changes{1.1}{2014-11-21}{new}
+%    \begin{macrocode}
+\LetTrackLangOption{fr-BE}{belgique}
+%    \end{macrocode}
+%\end{macro}
+%\begin{macro}{\@tracklang@add@pt-BR}
+%\changes{1.1}{2014-11-21}{new}
+%    \begin{macrocode}
+\LetTrackLangOption{pt-BR}{brazilian}
+%    \end{macrocode}
+%\end{macro}
+%\begin{macro}{\@tracklang@add@it-HR}
+%\changes{1.1}{2014-11-21}{new}
+%    \begin{macrocode}
+\LetTrackLangOption{it-HR}{istriacountyitalian}
+%    \end{macrocode}
+%\end{macro}
+%\begin{macro}{\@tracklang@add@nl-BE}
+%\changes{1.1}{2014-11-21}{new}
+%    \begin{macrocode}
+\LetTrackLangOption{nl-BE}{flemish}
+%    \end{macrocode}
+%\end{macro}
+%\begin{macro}{\@tracklang@add@fr-FR}
+%\changes{1.1}{2014-11-21}{new}
+%    \begin{macrocode}
+\LetTrackLangOption{fr-FR}{france}
+%    \end{macrocode}
+%\end{macro}
+%\begin{macro}{\@tracklang@add@de-DE}
+%\changes{1.1}{2014-11-21}{new}
+%    \begin{macrocode}
+\LetTrackLangOption{de-DE}{germanDE}
+%    \end{macrocode}
+%\end{macro}
+%\begin{macro}{\@tracklang@add@de-BE}
+%\changes{1.1}{2014-11-21}{new}
+%    \begin{macrocode}
+\LetTrackLangOption{de-BE}{belgiangerman}
+%    \end{macrocode}
+%\end{macro}
+%\begin{macro}{\@tracklang@add@en-GG}
+%\changes{1.1}{2014-11-21}{new}
+%    \begin{macrocode}
+\LetTrackLangOption{en-GG}{guernseyenglish}
+%    \end{macrocode}
+%\end{macro}
+%\begin{macro}{\@tracklang@add@fr-GG}
+%\changes{1.1}{2014-11-21}{new}
+%    \begin{macrocode}
+\LetTrackLangOption{fr-GG}{guernseyfrench}
+%    \end{macrocode}
+%\end{macro}
+%\begin{macro}{\@tracklang@add@it-IT}
+%\changes{1.1}{2014-11-21}{new}
+%    \begin{macrocode}
+\LetTrackLangOption{it-IT}{italy}
+%    \end{macrocode}
+%\end{macro}
+%\begin{macro}{\@tracklang@add@mt-MT}
+%\changes{1.1}{2014-11-21}{new}
+%    \begin{macrocode}
+\LetTrackLangOption{mt-MT}{maltamaltese}
+%    \end{macrocode}
+%\end{macro}
+%\begin{macro}{\@tracklang@add@en-MT}
+%\changes{1.1}{2014-11-21}{new}
+%    \begin{macrocode}
+\LetTrackLangOption{en-MT}{maltaenglish}
+%    \end{macrocode}
+%\end{macro}
+%\begin{macro}{\@tracklang@add@en-IM}
+%\changes{1.1}{2014-11-21}{new}
+%    \begin{macrocode}
+\LetTrackLangOption{en-IM}{isleofmanenglish}
+%    \end{macrocode}
+%\end{macro}
+%\begin{macro}{\@tracklang@add@en-JE}
+%\changes{1.1}{2014-11-21}{new}
+%    \begin{macrocode}
+\LetTrackLangOption{en-JE}{jerseyenglish}
+%    \end{macrocode}
+%\end{macro}
+%\begin{macro}{\@tracklang@add@fr-JE}
+%\changes{1.1}{2014-11-21}{new}
+%    \begin{macrocode}
+\LetTrackLangOption{fr-JE}{jerseyfrench}
+%    \end{macrocode}
+%\end{macro}
+%\begin{macro}{\@tracklang@add@nl-NL}
+%\changes{1.1}{2014-11-21}{new}
+%    \begin{macrocode}
+\LetTrackLangOption{nl-NL}{netherlands}
+%    \end{macrocode}
+%\end{macro}
+%\begin{macro}{\@tracklang@add@pt-PT}
+%\changes{1.1}{2014-11-21}{new}
+%    \begin{macrocode}
+\LetTrackLangOption{pt-PT}{portugal}
+%    \end{macrocode}
+%\end{macro}
+%\begin{macro}{\@tracklang@add@it-SM}
+%\changes{1.1}{2014-11-21}{new}
+%    \begin{macrocode}
+\LetTrackLangOption{it-SM}{sanmarino}
+%    \end{macrocode}
+%\end{macro}
+%\begin{macro}{\@tracklang@add@sl-SI}
+%\changes{1.1}{2014-11-21}{new}
+%    \begin{macrocode}
+\LetTrackLangOption{sl-SI}{slovenia}
+%    \end{macrocode}
+%\end{macro}
+%\begin{macro}{\@tracklang@add@it-SI}
+%\changes{1.1}{2014-11-21}{new}
+%    \begin{macrocode}
+\LetTrackLangOption{it-SI}{sloveneistriaitalian}
+%    \end{macrocode}
+%\end{macro}
+%\begin{macro}{\@tracklang@add@es-ES}
+%\changes{1.1}{2014-11-21}{new}
+%    \begin{macrocode}
+\LetTrackLangOption{es-ES}{spainspanish}
+%    \end{macrocode}
+%\end{macro}
+%\begin{macro}{\@tracklang@add@es-AR}
+%\changes{1.1}{2014-11-21}{new}
+%    \begin{macrocode}
+\LetTrackLangOption{es-AR}{argentinespanish}
+%    \end{macrocode}
+%\end{macro}
+%\begin{macro}{\@tracklang@add@es-BO}
+%\changes{1.1}{2014-11-21}{new}
+%    \begin{macrocode}
+\LetTrackLangOption{es-BO}{bolivianspanish}
+%    \end{macrocode}
+%\end{macro}
+%\begin{macro}{\@tracklang@add@es-CL}
+%\changes{1.1}{2014-11-21}{new}
+%    \begin{macrocode}
+\LetTrackLangOption{es-CL}{chilianspanish}
+%    \end{macrocode}
+%\end{macro}
+%\begin{macro}{\@tracklang@add@es-CO}
+%\changes{1.1}{2014-11-21}{new}
+%    \begin{macrocode}
+\LetTrackLangOption{es-CO}{columbianspanish}
+%    \end{macrocode}
+%\end{macro}
+%\begin{macro}{\@tracklang@add@es-CR}
+%\changes{1.1}{2014-11-21}{new}
+%    \begin{macrocode}
+\LetTrackLangOption{es-CR}{costaricanspanish}
+%    \end{macrocode}
+%\end{macro}
+%\begin{macro}{\@tracklang@add@es-CU}
+%\changes{1.1}{2014-11-21}{new}
+%    \begin{macrocode}
+\LetTrackLangOption{es-CU}{cubanspanish}
+%    \end{macrocode}
+%\end{macro}
+%\begin{macro}{\@tracklang@add@es-DO}
+%\changes{1.1}{2014-11-21}{new}
+%    \begin{macrocode}
+\LetTrackLangOption{es-DO}{dominicanspanish}
+%    \end{macrocode}
+%\end{macro}
+%\begin{macro}{\@tracklang@add@es-EC}
+%\changes{1.1}{2014-11-21}{new}
+%    \begin{macrocode}
+\LetTrackLangOption{es-EC}{ecudorianspanish}
+%    \end{macrocode}
+%\end{macro}
+%\begin{macro}{\@tracklang@add@es-SV}
+%\changes{1.1}{2014-11-21}{new}
+%    \begin{macrocode}
+\LetTrackLangOption{es-SV}{elsalvadorspanish}
+%    \end{macrocode}
+%\end{macro}
+%\begin{macro}{\@tracklang@add@es-GT}
+%\changes{1.1}{2014-11-21}{new}
+%    \begin{macrocode}
+\LetTrackLangOption{es-GT}{guatemalanspanish}
+%    \end{macrocode}
+%\end{macro}
+%\begin{macro}{\@tracklang@add@es-HN}
+%\changes{1.1}{2014-11-21}{new}
+%    \begin{macrocode}
+\LetTrackLangOption{es-HN}{honduranspanish}
+%    \end{macrocode}
+%\end{macro}
+%\begin{macro}{\@tracklang@add@es-MX}
+%\changes{1.1}{2014-11-21}{new}
+%    \begin{macrocode}
+\LetTrackLangOption{es-MX}{mexicanspanish}
+%    \end{macrocode}
+%\end{macro}
+%\begin{macro}{\@tracklang@add@es-NI}
+%\changes{1.1}{2014-11-21}{new}
+%    \begin{macrocode}
+\LetTrackLangOption{es-NI}{nicaraguanspanish}
+%    \end{macrocode}
+%\end{macro}
+%\begin{macro}{\@tracklang@add@es-PA}
+%\changes{1.1}{2014-11-21}{new}
+%    \begin{macrocode}
+\LetTrackLangOption{es-PA}{panamaspanish}
+%    \end{macrocode}
+%\end{macro}
+%\begin{macro}{\@tracklang@add@es-PY}
+%\changes{1.1}{2014-11-21}{new}
+%    \begin{macrocode}
+\LetTrackLangOption{es-PY}{paraguayspanish}
+%    \end{macrocode}
+%\end{macro}
+%\begin{macro}{\@tracklang@add@es-PE}
+%\changes{1.1}{2014-11-21}{new}
+%    \begin{macrocode}
+\LetTrackLangOption{es-PE}{peruvianspanish}
+%    \end{macrocode}
+%\end{macro}
+%\begin{macro}{\@tracklang@add@es-PR}
+%\changes{1.1}{2014-11-21}{new}
+%    \begin{macrocode}
+\LetTrackLangOption{es-PR}{puertoricospanish}
+%    \end{macrocode}
+%\end{macro}
+%\begin{macro}{\@tracklang@add@es-UY}
+%\changes{1.1}{2014-11-21}{new}
+%    \begin{macrocode}
+\LetTrackLangOption{es-UY}{uruguayspanish}
+%    \end{macrocode}
+%\end{macro}
+%\begin{macro}{\@tracklang@add@es-VE}
+%\changes{1.1}{2014-11-21}{new}
+%    \begin{macrocode}
+\LetTrackLangOption{es-VE}{venezuelanspanish}
+%    \end{macrocode}
+%\end{macro}
+%\begin{macro}{\@tracklang@add@de-CH}
+%\changes{1.1}{2014-11-21}{new}
+%    \begin{macrocode}
+\LetTrackLangOption{de-CH}{swissgerman}
+%    \end{macrocode}
+%\end{macro}
+%\begin{macro}{\@tracklang@add@fr-CH}
+%\changes{1.1}{2014-11-21}{new}
+%    \begin{macrocode}
+\LetTrackLangOption{fr-CH}{swissfrench}
+%    \end{macrocode}
+%\end{macro}
+%\begin{macro}{\@tracklang@add@it-CH}
+%\changes{1.1}{2014-11-21}{new}
+%    \begin{macrocode}
+\LetTrackLangOption{it-CH}{swissitalian}
+%    \end{macrocode}
+%\end{macro}
+%\begin{macro}{\@tracklang@add@rm-CH}
+%\changes{1.1}{2014-11-21}{new}
+%    \begin{macrocode}
+\LetTrackLangOption{rm-CH}{swissromansh}
+%    \end{macrocode}
+%\end{macro}
+%\begin{macro}{\@tracklang@add@it-VA}
+%\changes{1.1}{2014-11-21}{new}
+%    \begin{macrocode}
+\LetTrackLangOption{it-VA}{vatican}
+%    \end{macrocode}
+%\end{macro}
+%\begin{macro}{\@tracklang@add@ga-IE}
+%\changes{1.2}{2015-03-23}{new}
+% Irish Gaelic in Republic of Ireland.
+%    \begin{macrocode}
+\LetTrackLangOption{ga-IE}{IEirish}
+%    \end{macrocode}
+%\end{macro}
+%\begin{macro}{\@tracklang@add@ga-GB}
+%\changes{1.2}{2015-03-23}{new}
+% Irish Gaelic in Northern Ireland.
+%    \begin{macrocode}
+\LetTrackLangOption{ga-GB}{GBirish}
+%    \end{macrocode}
+%\end{macro}
+%\begin{macro}{\@tracklang@add@en-IE}
+%\changes{1.2}{2015-03-23}{new}
+% English spoken in Republic of Ireland.
+%    \begin{macrocode}
+\LetTrackLangOption{en-IE}{IEenglish}
+%    \end{macrocode}
+%\end{macro}
+%\begin{macro}{\@tracklang@add@de-AT-1996}
+%\changes{1.3}{2016-10-07}{new}
+%    \begin{macrocode}
+\LetTrackLangOption{de-AT-1996}{naustrian}
+%    \end{macrocode}
+%\end{macro}
+%\begin{macro}{\@tracklang@add@de-AT}
+%\changes{1.3}{2016-10-07}{new}
+%    \begin{macrocode}
+\LetTrackLangOption{de-AT}{austrian}
+%    \end{macrocode}
+%\end{macro}
+%\begin{macro}{\@tracklang@add@id-IN}
+%\changes{1.3}{2016-10-07}{new}
+%    \begin{macrocode}
+\LetTrackLangOption{id-IN}{bahasa}
+%    \end{macrocode}
+%\end{macro}
+%\begin{macro}{\@tracklang@add@ms-MY}
+%\changes{1.3}{2016-10-07}{new}
+%    \begin{macrocode}
+\LetTrackLangOption{ms-MY}{malay}
+%    \end{macrocode}
+%\end{macro}
+%\begin{macro}{\@tracklang@add@hr-HR}
+%\changes{1.3}{2016-10-07}{new}
+%    \begin{macrocode}
+\LetTrackLangOption{hr-HR}{croatia}
+%    \end{macrocode}
+%\end{macro}
+%\begin{macro}{\@tracklang@add@de-DE-1996}
+%\changes{1.3}{2016-10-07}{new}
+%    \begin{macrocode}
+\LetTrackLangOption{de-DE-1996}{ngermanDE}
+%    \end{macrocode}
+%\end{macro}
+%\begin{macro}{\@tracklang@add@de-CH-1996}
+%\changes{1.3}{2016-10-07}{new}
+%    \begin{macrocode}
+\LetTrackLangOption{de-CH-1996}{nswissgerman}
+%    \end{macrocode}
+%\end{macro}
+%\begin{macro}{\@tracklang@add@hu-HU}
+%\changes{1.3}{2016-10-07}{new}
+%    \begin{macrocode}
+\LetTrackLangOption{hu-HU}{hungarian}
+%    \end{macrocode}
+%\end{macro}
+%\begin{macro}{\@tracklang@add@gd-GB}
+%\changes{1.3}{2016-10-07}{new}
+%    \begin{macrocode}
+\LetTrackLangOption{gd-GB}{GBscottish}
+%    \end{macrocode}
+%\end{macro}
+%\begin{macro}{\@tracklang@add@cy-GB}
+%\changes{1.3}{2016-10-07}{new}
+%    \begin{macrocode}
+\LetTrackLangOption{cy-GB}{GBwelsh}
+%    \end{macrocode}
+%\end{macro}
+%
+%\subsection{Conditionals and Loops}
+%
+%\begin{macro}{\IfTrackedLanguage}
+%\begin{definition}
+%\cs{IfTrackedLanguage}\marg{language}\marg{true part}\marg{false
+%part}
+%\end{definition}
+%    \begin{macrocode}
+\long\def\IfTrackedLanguage#1#2#3{%
+%    \end{macrocode}
+% First find out if the language name is empty.
+%    \begin{macrocode}
+  \edef\@tracklang@element{#1}%
+  \ifx\@tracklang@element\empty
+%    \end{macrocode}
+% Language is empty, so do false part.
+%    \begin{macrocode}
+    #3%
+  \else
+    \expandafter\@tracklang@ifinlist\expandafter{\@tracklang@element}%
+      \@tracklang@languages
+    {%
+%    \end{macrocode}
+% In list, so do true part.
+%    \begin{macrocode}
+      #2%
+    }%
+    {%
+%    \end{macrocode}
+% Not in list, so do false part.
+%    \begin{macrocode}
+      #3%
+    }%
+  \fi
+}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\IfTrackedDialect}
+%\begin{definition}
+%\cs{IfTrackedDialect}\marg{dialect}\marg{true part}\marg{false
+%part}
+%\end{definition}
+%    \begin{macrocode}
+\long\def\IfTrackedDialect#1#2#3{%
+  \@tracklang@ifundef{@tracklang@fromdialect@#1}{#3}{#2}%
+}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\IfTrackedIsoCode}
+%\begin{definition}
+%\cs{IfTrackedIsoCode}\marg{code type}\marg{code}\marg{true part}\marg{false
+%part}
+%\end{definition}
+%    \begin{macrocode}
+\long\def\IfTrackedIsoCode#1#2#3#4{%
+  \@tracklang@ifundef{@tracklang@#1@isotolang@#2}{#4}{#3}%
+}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\IfTrackedLanguageHasIsoCode}
+%\begin{definition}
+%\cs{IfTrackedLanguageHasIsoCode}\marg{code type}\marg{language}\marg{true part}\marg{false
+%part}
+%\end{definition}
+%    \begin{macrocode}
+\long\def\IfTrackedLanguageHasIsoCode#1#2#3#4{%
+  \@tracklang@ifundef{@tracklang@#1@isofromlang@#2}{#4}{#3}%
+}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\ForEachTrackedLanguage}
+%\begin{definition}
+%\cs{ForEachTrackedLanguage}\marg{cs}\marg{body}
+%\end{definition}
+% Iterates through the list of tracked languages. On each iteration
+% \meta{cs} is set to the language tag and \meta{body} is performed.
+%    \begin{macrocode}
+\long\def\ForEachTrackedLanguage#1#2{%
+  \@tracklang@for#1:=\@tracklang@languages\do{#2}%
+}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\ForEachTrackedDialect}
+%\begin{definition}
+%\cs{ForEachTrackedDialect}\marg{cs}\marg{body}
+%\end{definition}
+% Iterates through the list of tracked dialects. On each iteration
+% \meta{cs} is set to the dialect tag and \meta{body} is performed.
+%    \begin{macrocode}
+\long\def\ForEachTrackedDialect#1#2{%
+  \@tracklang@for#1:=\@tracklang@dialects\do{#2}%
+}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\AnyTrackedLanguages}
+%    \begin{macrocode}
+\long\def\AnyTrackedLanguages#1#2{%
+  \ifx\@tracklang@languages\empty
+    #2%
+  \else
+    #1%
+  \fi
+}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\IfTrackedLanguageFileExists}
+%\begin{definition}
+%\cs{IfTrackedLanguageFileExists}\marg{dialect}\marg{prefix}\marg{suffix}\marg{true
+%part}\marg{false part}
+%\end{definition}
+% Determines if the file \meta{prefix}\meta{tag}\meta{suffix}
+% exists, where \meta{tag} is an ISO code or ISO codes identifying
+% the language. If \meta{dialect} hasn't been identified
+% as a tracked dialect, this just does \meta{false part},
+% otherwise this first tries with \meta{tag} set to
+% \meta{dialect}, then tries with \meta{tag} set to the root
+% language label for \meta{dialect}, then tries with \meta{tag} set to \meta{ISO
+% 639-1 code}\texttt{-}\meta{ISO 3166-1 code}, then tries with
+% \meta{tag} set to \meta{ISO 639-1 code}, then tries with
+% \meta{tag} set to \meta{ISO 639-2 code}\texttt{-}\meta{ISO 3166-1
+% code}, then tries with \meta{tag} set to \meta{ISO 639-2 code}.
+% If the file \meta{prefix}\meta{tag}\meta{suffix} exists, 
+% \cs{CurrentTrackedTag} is set to \meta{tag} and \meta{true part}
+% is performed, otherwise \meta{false part} is performed.
+%    \begin{macrocode}
+\long\def\IfTrackedLanguageFileExists#1#2#3#4#5{%
+%    \end{macrocode}
+%Initialise.
+%    \begin{macrocode}
+   \def\CurrentTrackedTag{}%
+%    \end{macrocode}
+%Select this dialect.
+%    \begin{macrocode}
+   \SetCurrentTrackedDialect{#1}%
+   \IfTrackedDialect{#1}%
+   {%
+%    \end{macrocode}
+% Try just the dialect label.
+%    \begin{macrocode}
+     \edef\CurrentTrackedTag{#1}%
+     \@tracklang@IfFileExists{#2\CurrentTrackedTag#3}%
+     {#4}%
+     {%
+%    \end{macrocode}
+% No file found for dialect label, try \meta{ISO 639-1}-\meta{ISO
+% 3166-1} next.
+%    \begin{macrocode}
+       \IfTrackedLanguageHasIsoCode
+         {639-1}{\CurrentTrackedLanguage}
+       {%
+          \edef\CurrentTrackedIsoCode{%
+             \TrackedIsoCodeFromLanguage
+               {639-1}{\CurrentTrackedLanguage}}%
+          \ifx\CurrentTrackedRegion\empty
+%    \end{macrocode}
+% No region, just try ISO 639-1 code
+%    \begin{macrocode}
+            \let\CurrentTrackedTag\CurrentTrackedIsoCode
+            \@tracklang@IfFileExists{#2\CurrentTrackedTag#3}%
+            {#4}
+            {%
+%    \end{macrocode}
+% No region and file for just \meta{ISO 639-1 code}. Try ISO 639-2 code.
+% (No check for 639-3 since it has 639-1 code.)
+%    \begin{macrocode}
+              \IfTrackedLanguageHasIsoCode
+                {639-2}{\CurrentTrackedLanguage}
+              {%
+                 \edef\CurrentTrackedIsoCode{%
+                    \TrackedIsoCodeFromLanguage
+                      {639-2}{\CurrentTrackedLanguage}}%
+                 \let\CurrentTrackedTag\CurrentTrackedIsoCode
+                 \@tracklang@IfFileExists{#2\CurrentTrackedTag#3}%
+                 {#4}%
+                 {%
+%    \end{macrocode}
+% Try root language.
+%    \begin{macrocode}
+                   \let\CurrentTrackedTag\CurrentTrackedLanguage
+                   \@tracklang@IfFileExists{#2\CurrentTrackedTag#3}{#4}{#5}%
+                 }%
+              }%
+              {%
+%    \end{macrocode}
+% No region, no ISO 639-1 code and no ISO 639-2 code.
+% No file found for dialect label, try root language label next.
+%    \begin{macrocode}
+               \let\CurrentTrackedTag\CurrentTrackedLanguage
+               \@tracklang@IfFileExists{#2\CurrentTrackedTag#3}{#4}{#5}%
+              }%
+            }%
+          \else
+%    \end{macrocode}
+% Has a region so try \meta{ISO 639-1 code}\texttt{-}\meta{region}
+%    \begin{macrocode}
+            \edef\CurrentTrackedTag{%
+              \CurrentTrackedIsoCode-\CurrentTrackedRegion}%
+            \@tracklang@IfFileExists{#2\CurrentTrackedTag#3}%
+            {#4}
+            {%
+%    \end{macrocode}
+% Has a region but \meta{ISO 639-1 code}\texttt{-}\meta{region}
+% not found, so try \meta{ISO 639-2 code}\texttt{-}\meta{region}
+%    \begin{macrocode}
+              \IfTrackedLanguageHasIsoCode
+              {639-2}{\CurrentTrackedLanguage}
+              {%
+                \let\org@currenttrackedisocode\CurrentTrackedIsoCode
+                \edef\CurrentTrackedIsoCode{%
+                  \TrackedIsoCodeFromLanguage
+                  {639-2}{\CurrentTrackedLanguage}}%
+                \edef\CurrentTrackedTag{%
+                  \CurrentTrackedIsoCode-\CurrentTrackedRegion}%
+                \@tracklang@IfFileExists{#2\CurrentTrackedTag#3}%
+                {#4}%
+                {%
+%    \end{macrocode}
+% Has a region but \meta{ISO 639-1 code}\texttt{-}\meta{region} not
+% found and \meta{ISO 639-2 code}\texttt{-}\meta{region} not found,
+% so try just \meta{ISO 639-1 code}
+%    \begin{macrocode}
+                  \let\CurrentTrackedTag\org@currenttrackedisocode
+                  \let\org@currenttrackedisocode\CurrentTrackedIsoCode
+                  \let\CurrentTrackedIsoCode\CurrentTrackedTag
+                  \@tracklang@IfFileExists{#2\CurrentTrackedTag#3}%
+                  {#4}
+                  {%
+%    \end{macrocode}
+% Try just the ISO 639-2 code.
+%    \begin{macrocode}
+                    \let\CurrentTrackedIsoCode\org@currenttrackedisocode
+                    \let\CurrentTrackedTag\CurrentTrackedIsoCode
+                    \@tracklang@IfFileExists{#2\CurrentTrackedTag#3}%
+                    {#4}%
+                    {%
+%    \end{macrocode}
+% Try just the region.
+%    \begin{macrocode}
+                      \let\CurrentTrackedTag\CurrentTrackedRegion
+                      \@tracklang@IfFileExists{#2\CurrentTrackedTag#3}%
+                      {#4}%
+                      {%
+%    \end{macrocode}
+% Try the root language.
+%    \begin{macrocode}
+                        \let\CurrentTrackedTag\CurrentTrackedLanguage
+                        \@tracklang@IfFileExists{#2\CurrentTrackedTag#3}{#4}{#5}%
+                      }%
+                    }%
+                  }%
+                }%
+              }%
+              {%
+%    \end{macrocode}
+% Has a region but \meta{ISO 639-1 code}\texttt{-}\meta{region}
+% not found, and no ISO 639-2 code so just try \meta{ISO 639-1 code}
+%    \begin{macrocode}
+                \let\CurrentTrackedTag\CurrentTrackedIsoCode
+                \@tracklang@IfFileExists{#2\CurrentTrackedTag#3}%
+                {#4}%
+                {%
+%    \end{macrocode}
+% Just try the region
+%    \begin{macrocode}
+                  \let\CurrentTrackedTag\CurrentTrackedRegion
+                  \@tracklang@IfFileExists{#2\CurrentTrackedTag#3}%
+                  {#4}%
+                  {%
+%    \end{macrocode}
+% Try the root language.
+%    \begin{macrocode}
+                    \let\CurrentTrackedTag\CurrentTrackedLanguage
+                    \@tracklang@IfFileExists{#2\CurrentTrackedTag#3}{#4}{#5}%
+                  }%
+                }%
+              }%
+            }%
+          \fi
+       }%
+       {%
+%    \end{macrocode}
+% No ISO 639-1 code. Try ISO 639-2 code.
+%    \begin{macrocode}
+         \IfTrackedLanguageHasIsoCode
+           {639-2}{\CurrentTrackedLanguage}
+         {%
+            \edef\CurrentTrackedIsoCode{%
+               \TrackedIsoCodeFromLanguage
+               {639-2}{\CurrentTrackedLanguage}}%
+         }%
+         {%
+%    \end{macrocode}
+% No ISO 639-1 code or ISO 639-2 code. Try 639-3 code.
+%    \begin{macrocode}
+           \IfTrackedLanguageHasIsoCode
+             {639-3}{\CurrentTrackedLanguage}
+           {%
+              \edef\CurrentTrackedIsoCode{%
+                 \TrackedIsoCodeFromLanguage
+                 {639-3}{\CurrentTrackedLanguage}}%
+           }%
+           {%
+              \let\CurrentTrackedIsoCode\empty
+           }%
+         }%
+         \ifx\CurrentTrackedIsoCode\empty
+%    \end{macrocode}
+% No ISO 639-1 code or ISO 639-2 code. Try just the region.
+%    \begin{macrocode}
+           \ifx\CurrentTrackedRegion\empty
+%    \end{macrocode}
+% No region. Try the root language.
+%    \begin{macrocode}
+             \let\CurrentTrackedTag\CurrentTrackedLanguage
+             \@tracklang@IfFileExists{#2\CurrentTrackedTag#3}{#4}{#5}%
+           \else
+%    \end{macrocode}
+% Try the region.
+%    \begin{macrocode}
+             \let\CurrentTrackedTag\CurrentTrackedRegion
+             \@tracklang@IfFileExists{#2\CurrentTrackedTag#3}%
+             {#4}%
+             {%
+%    \end{macrocode}
+% Try the root language.
+%    \begin{macrocode}
+               \let\CurrentTrackedTag\CurrentTrackedLanguage
+               \@tracklang@IfFileExists{#2\CurrentTrackedTag#3}{#4}{#5}%
+             }%
+           \fi
+         \else
+%    \end{macrocode}
+% Has ISO 639-2 or 639-3 code.
+%    \begin{macrocode}
+            \ifx\CurrentTrackedRegion\empty
+%    \end{macrocode}
+% Has ISO 639-2 or 639-3 code but no region.
+%    \begin{macrocode}
+              \let\CurrentTrackedTag\CurrentTrackedIsoCode
+              \@tracklang@IfFileExists{#2\CurrentTrackedTag#3}%
+              {#4}%
+              {%
+%    \end{macrocode}
+% Try the root language.
+%    \begin{macrocode}
+                \let\CurrentTrackedTag\CurrentTrackedLanguage
+                \@tracklang@IfFileExists{#2\CurrentTrackedTag#3}{#4}{#5}%
+              }%
+            \else
+%    \end{macrocode}
+% Has ISO 639-2 or 639-3 code and a region. Try \meta{ISO
+% 639-2 or 639-3}\texttt{-}\meta{region} first.
+%    \begin{macrocode}
+              \edef\CurrentTrackedTag{%
+                \CurrentTrackedIsoCode-\CurrentTrackedRegion}%
+              \@tracklang@IfFileExists{#2\CurrentTrackedTag#3}%
+              {#4}%
+              {%
+%    \end{macrocode}
+% Has ISO 639-2 or 639-3 code and a region but \meta{ISO
+% 639-2 or 639-3}\texttt{-}\meta{region} doesn't exist. Try just \meta{ISO
+% 639-2 or 639-3}
+%    \begin{macrocode}
+                \let\CurrentTrackedTag\CurrentTrackedIsoCode
+                \@tracklang@IfFileExists{#2\CurrentTrackedTag#3}%
+                {#4}%
+                {%
+%    \end{macrocode}
+% Has ISO 639-2 or 639-3 code and a region but \meta{ISO
+% 639-2 or 639-3} doesn't exist. Try just \meta{region}
+%    \begin{macrocode}
+                  \let\CurrentTrackedTag\CurrentTrackedRegion
+                  \@tracklang@IfFileExists{#2\CurrentTrackedTag#3}%
+                  {#4}%
+                  {%
+%    \end{macrocode}
+% Try the root language.
+%    \begin{macrocode}
+                    \let\CurrentTrackedTag\CurrentTrackedLanguage
+                    \@tracklang@IfFileExists{#2\CurrentTrackedTag#3}{#4}{#5}%
+                  }%
+                }%
+              }%
+            \fi
+         \fi
+       }%
+     }%
+   }%
+   {#5}% unknown dialect
+}
+%    \end{macrocode}
+%\end{macro}
+%
+%\subsection{Resources}
+%Provide some commands to make it easier for package authors to
+%integrate the package code with \styfmt{tracklang}. In the
+%command definition describes below, \meta{pkgname} indicates the
+%initial part of the resource files that follow the naming
+%convention, \meta{pkgname}\texttt{-}\meta{tag}\texttt{.ldf}.
+%Typically this will match the base name of the package that uses
+%those resource files, but this isn't compulsory.
+% The argument \meta{tag} is the current tracked tag obtained from
+% \cs{IfTrackedLanguageFileExists}.
+%
+%\begin{macro}{\TrackLangProvidesResource}
+%\changes{1.3}{2016-10-07}{new}
+%\begin{definition}
+%\cs{TrackLangProvidesResource}\marg{tag}\oarg{version}
+%\end{definition}
+%If \cs{ProvidesFile} exists, we can use that, otherwise we need to
+%provide a generic version.
+%    \begin{macrocode}
+\ifx\ProvidesFile\undefined
+%    \end{macrocode}
+%Generic code uses simplistic method to grab the version
+%details in the final optional argument. Since we're not using
+%\LaTeX\ we don't have commands like \cs{@ifnextchar} available.
+%    \begin{macrocode}
+  \long\def\TrackLangProvidesResource#1#2{%
+    \ifx\TrackLangRequireDialectPrefix\undefined
+      \@tracklang@err{Resources files using 
+        \string\TrackLangProvidesResource\space
+        must be loaded with \string\TrackLangRequireDialect}%
+    \fi
+    \ifx#2[\relax
+      \def\@tracklang@next{%
+        \@tracklang@providesresource{\TrackLangRequireDialectPrefix-#1.ldf}#2%
+      }
+    \else
+      \expandafter\xdef\csname ver@\TrackLangRequireDialectPrefix
+        -#1.ldf\endcsname{}%
+      {%
+        \newlinechar=`\^^J
+        \def\MessageBreak{^^J}%
+        \message{^^JFile: \TrackLangRequireDialectPrefix-#1.ldf^^J}%
+      }%
+      \long\def\@tracklang@next{#2}%
+    \fi
+    \@tracklang@next
+  }
+  \def\@tracklang@providesresource#1[#2]{%
+    \expandafter\xdef\csname ver@#1\endcsname{#2}%
+     {%
+       \newlinechar=`\^^J
+       \def\MessageBreak{^^J}%
+       \message{^^JFile: #1 #2^^J}%
+     }%
+  }
+\else
+%    \end{macrocode}
+%\LaTeX\ code can simply use \cs{ProvidesFile}.
+%    \begin{macrocode}
+  \def\TrackLangProvidesResource#1{%
+    \ifx\TrackLangRequireDialectPrefix\undefined
+      \@tracklang@err{Resources files using 
+        \string\TrackLangProvidesResource\space
+        must be loaded with \string\TrackLangRequireDialect}%
+    \fi
+    \ProvidesFile{\TrackLangRequireDialectPrefix-#1.ldf}%
+  }
+\fi
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\TrackLangAddToHook}
+%\changes{1.3}{2016-10-07}{new}
+%\begin{definition}
+%\cs{TrackLangAddToHook}\marg{code}\marg{type}
+%\end{definition}
+%Within the resource files, a check is required for the language
+%hook, where the hook type is given by \meta{type}.
+% For example, if \meta{type} is \texttt{captions}, the for \sty{babel},
+%this is \cs{captions\meta{dialect}} (dialect
+%obtained through \cs{CurrentTrackedDialect}) and
+%for \sty{polyglossia}, this is \cs{captions\meta{language}}
+%(language obtained through \cs{CurrentTrackedLanguage}).
+%This command is not permitted outside resource files.
+%    \begin{macrocode}
+\def\TrackLangAddToHook{\noop@TrackLangAddToHook}
+%    \end{macrocode}
+%\end{macro}
+%\begin{macro}{\noop@TrackLangAddToHook}
+%    \begin{macrocode}
+\def\noop@TrackLangAddToHook#1#2{%
+  \@tracklang@err{\string\TrackLangAddToHook\space
+  only permitted within resource files}
+}
+%    \end{macrocode}
+%\end{macro}
+%\begin{macro}{\@TrackLangAddToHook}
+%    \begin{macrocode}
+\def\@TrackLangAddToHook#1#2{%
+%    \end{macrocode}
+% \sty{babel} check first.
+%    \begin{macrocode}
+  \@tracklang@ifundef{#2\CurrentTrackedDialect}%
+  {%
+%    \end{macrocode}
+% Does the dialect label have a mapping?
+%    \begin{macrocode}
+    \IfTrackedDialectHasMapping{\CurrentTrackedDialect}%
+    {%
+%    \end{macrocode}
+% Try the mapping label next.
+%    \begin{macrocode}
+      \edef\@tracklang@tmp{%
+        \csname @tracklang@dialectmap@tohook@\CurrentTrackedDialect\endcsname}%
+      \@tracklang@ifundef{#2\@tracklang@tmp}%
+      {%
+%    \end{macrocode}
+% No captions hook. Try \sty{polyglossia}.
+%    \begin{macrocode}
+        \@tracklang@ifundef{#2\CurrentTrackedLanguage}%
+        {%
+%    \end{macrocode}
+% No captions hook. Do the code now.
+%    \begin{macrocode}
+          #1%
+        }%
+        {%
+          \@tracklang@addtohook{#2}{\CurrentTrackedLanguage}{#1}%
+        }%
+      }%
+      {%
+        \@tracklang@addtohook{#2}{\@tracklang@tmp}{#1}%
+      }%
+    }%
+    {%
+%    \end{macrocode}
+% \sty{polyglossia} check next.
+%    \begin{macrocode}
+      \@tracklang@ifundef{#2\CurrentTrackedLanguage}%
+      {%
+%    \end{macrocode}
+% No captions hook.
+%    \begin{macrocode}
+      }%
+      {%
+        \@tracklang@addtohook{#2}{\CurrentTrackedLanguage}{#1}%
+      }%
+    }%
+  }%
+  {%
+     \@tracklang@addtohook{#2}{\CurrentTrackedDialect}{#1}%
+  }%
+%    \end{macrocode}
+% Do the code now. (This is needed for cases such as the \sty{ngerman}
+% which defines \cs{captionsngerman} but calls it immediately rather
+% than at the start of the document.)
+%    \begin{macrocode}
+  #1%
+}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@tracklang@addtohook}
+%\changes{1.3}{2016-10-07}{new}
+%\begin{definition}
+%\cs{@tracklang@addtohook}\marg{type}\marg{label}\marg{code}
+%\end{definition}
+%    \begin{macrocode}
+\def\@tracklang@addtohook#1#2#3{%
+ \expandafter\let\expandafter\@tracklang@hook\csname #1#2\endcsname
+ \expandafter
+  \gdef\csname#1#2\expandafter\endcsname\expandafter{\@tracklang@hook#3}%
+}
+%    \end{macrocode}
+%\end{macro}
+%
+%Since the captions hook is the most common, provide a shortcut.
+%\begin{macro}{\TrackLangAddToCaptions}
+%\changes{1.3}{2016-10-07}{new}
+%\begin{definition}
+%\cs{TrackLangAddToCaptions}\marg{code}
+%\end{definition}
+%    \begin{macrocode}
+\def\TrackLangAddToCaptions#1{\TrackLangAddToHook{#1}{captions}}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\SetTrackedDialectLabelMap}
+%\changes{1.3}{2016-10-07}{new}
+%\begin{definition}
+%\cs{SetTrackedDialectLabelMap}\marg{tracklang-label}\marg{hook-label}
+%\end{definition}
+%Define a mapping between a \styfmt{tracklang} dialect label and the
+%corresponding label used by the language hook. For example,
+%\texttt{ngermanDE} is a recognised \styfmt{tracklang} dialect
+%label, but the closest \sty{babel} equivalent is \texttt{ngerman},
+%so \texttt{ngermanDE} would need to be mapped to \texttt{ngerman}
+%for the language hooks. The arguments are \meta{tracklang-label} (the
+%\styfmt{tracklang} dialect label) and \meta{hook-label} (the \sty{babel},
+%\sty{polyglossia} etc label).
+%    \begin{macrocode}
+\def\SetTrackedDialectLabelMap#1#2{%
+%    \end{macrocode}
+% Store the mapping that can obtain the hook label from the
+% tracklang label (tracklang to hook).
+%    \begin{macrocode}
+  \@tracklang@enamedef{@tracklang@dialectmap@tohook@#1}{#2}%
+%    \end{macrocode}
+% Store the mapping that can obtain the tracklang label from the
+% hook label.
+%    \begin{macrocode}
+  \@tracklang@enamedef{@tracklang@dialectmap@fromhook@#2}{#1}%
+}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\IfTrackedDialectHasMapping}
+%\changes{1.3}{2016-10-07}{new}
+%\begin{definition}
+%\cs{IfTrackedDialectHasMapping}\marg{tracklang label}\marg{true}\marg{false}
+%\end{definition}
+%Test if the \styfmt{tracklang} dialect label has been assigned a
+%mapping to a language hook.
+%    \begin{macrocode}
+\def\IfTrackedDialectHasMapping#1#2#3{%
+  \@tracklang@ifundef{@tracklang@dialectmap@tohook@#1}{#3}{#2}%
+}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\IfHookHasMappingFromTrackedDialect}
+%\changes{1.3.3}{2016-11-03}{new}
+%\begin{definition}
+%\cs{IfHookHasMappingFromTrackedDialect}\marg{hook label}\marg{true}\marg{false}
+%\end{definition}
+%Tests if the language hook label has been assigned a mapping from a
+%\styfmt{tracklang} dialect label.
+%    \begin{macrocode}
+\def\IfHookHasMappingFromTrackedDialect#1#2#3{%
+  \@tracklang@ifundef{@tracklang@dialectmap@fromhook@#1}{#3}{#2}%
+}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\GetTrackedDialectToMapping}
+%\changes{1.3}{2016-10-07}{new}
+%\begin{definition}
+%\cs{GetTrackedDialectToMapping}\marg{tracklang label}
+%\end{definition}
+%Gets the mapping for the given \styfmt{tracklang} dialect label to a
+%language hook label or the \meta{label} itself if no mapping has been defined.
+%    \begin{macrocode}
+\def\GetTrackedDialectToMapping#1{%
+  \@tracklang@ifundef{@tracklang@dialectmap@tohook@#1}{#1}%
+  {\csname @tracklang@dialectmap@tohook@#1\endcsname}%
+}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\GetTrackedDialectFromMapping}
+%\changes{1.3}{2016-10-07}{new}
+%\begin{definition}
+%\cs{GetTrackedDialectFromMapping}\marg{language hook}
+%\end{definition}
+%Gets the reverse mapping from the given language hook to the
+%\styfmt{tracklang} label.
+%    \begin{macrocode}
+\def\GetTrackedDialectFromMapping#1{%
+  \@tracklang@ifundef{@tracklang@dialectmap@fromhook@#1}{#1}%
+  {\csname @tracklang@dialectmap@fromhook@#1\endcsname}%
+}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\TrackLangRequireResource}
+%\changes{1.3}{2016-10-07}{new}
+%\begin{definition}
+%\cs{TrackLangRequireResource}\marg{tag}
+%\end{definition}
+%    \begin{macrocode}
+\def\TrackLangRequireResource{\noop@TrackLangRequireResource}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\noop@TrackLangRequireResource}
+%\changes{1.3}{2016-10-07}{new}
+%Default behaviour outside of resources files: generate an
+%error and ignore arguments.
+%    \begin{macrocode}
+\def\noop@TrackLangRequireResource#1{%
+  \@tracklang@err{\string\TrackLangRequireResource\space
+  only permitted within resource files}
+}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@TrackLangRequireResource}
+%\changes{1.3}{2016-10-07}{new}
+%Actual behaviour.
+%    \begin{macrocode}
+\def\@TrackLangRequireResource#1{%
+  \@tracklang@ifundef{ver@\TrackLangRequireDialectPrefix-#1.ldf}%
+  {%
+    \@tracklang@IfFileExists{\TrackLangRequireDialectPrefix-#1.ldf}%
+    {%
+      \input \TrackLangRequireDialectPrefix-#1.ldf
+    }%
+    {%
+      \@tracklang@warn{No `\TrackLangRequireDialectPrefix' support for 
+      language/region `#1'\MessageBreak
+      (resource file `\TrackLangRequireDialectPrefix-#1.ldf' not found)}%
+    }%
+  }%
+  {}%
+}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\TrackLangRequireResourceOrDo}
+%\changes{1.3}{2016-10-07}{new}
+%\begin{definition}
+%\cs{TrackLangRequireResourceOrDo}\marg{tag}\marg{resource
+%loaded code}\marg{resource already loaded code}
+%\end{definition}
+%Like \cs{TrackLangRequireResource} but also does \meta{resource
+%loaded code} if the resource file is loaded or \meta{resource
+%already loaded code} if the resource file has already been loaded.
+%    \begin{macrocode}
+\def\TrackLangRequireResourceOrDo{%
+  \noop@TrackLangRequireResourceOrDo
+}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\noop@TrackLangRequireResourceOrDo}
+%\changes{1.3}{2016-10-07}{new}
+%Default behaviour outside of resources files: generate an
+%error and ignore arguments.
+%    \begin{macrocode}
+\def\noop@TrackLangRequireResourceOrDo#1#2#3{%
+  \@tracklang@err{\string\TrackLangRequireResourceOrDo\space
+  only permitted within resource files}
+}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@TrackLangRequireResourceOrDo}
+%\changes{1.3}{2016-10-07}{new}
+%Actual behaviour.
+%    \begin{macrocode}
+\def\@TrackLangRequireResourceOrDo#1#2#3{%
+  \@tracklang@ifundef{ver@\TrackLangRequireDialectPrefix-#1.ldf}%
+  {%
+    \@tracklang@IfFileExists{\TrackLangRequireDialectPrefix-#1.ldf}%
+    {%
+      \input \TrackLangRequireDialectPrefix-#1.ldf
+      #2%
+    }%
+    {%
+      \@tracklang@warn{No `\TrackLangRequireDialectPrefix' support for 
+      language/region `#1'\MessageBreak
+      (resource file `\TrackLangRequireDialectPrefix-#1.ldf' not found)}%
+    }%
+  }%
+  {#3}%
+}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\TrackLangRequestResource}
+%\changes{1.3}{2016-10-07}{new}
+%\begin{definition}
+%\cs{TrackLangRequestResource}\marg{tag}\marg{not found code}
+%\end{definition}
+%Like \cs{TrackLangRequireResource} but does \meta{not found code}
+%if the file doesn't exist.
+%    \begin{macrocode}
+\def\TrackLangRequestResource{\noop@TrackLangRequestResource}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\noop@TrackLangRequestResource}
+%\changes{1.3}{2016-10-07}{new}
+%Default behaviour outside of resources files: generate an
+%error and ignore arguments.
+%    \begin{macrocode}
+\def\noop@TrackLangRequestResource#1#2{%
+  \@tracklang@err{\string\TrackLangRequestResource\space
+  only permitted within resource files}
+}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\@TrackLangRequestResource}
+%\changes{1.3}{2016-10-07}{new}
+%Actual behaviour.
+%    \begin{macrocode}
+\def\@TrackLangRequestResource#1#2{%
+  \@tracklang@ifundef{ver@\TrackLangRequireDialectPrefix-#1.ldf}%
+  {%
+    \@tracklang@IfFileExists{\TrackLangRequireDialectPrefix-#1.ldf}%
+    {%
+      \input \TrackLangRequireDialectPrefix-#1.ldf
+    }%
+    {#2}%
+  }%
+  {}%
+}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\TrackLangRequireDialect}
+%\changes{1.3}{2016-10-07}{new}
+%\begin{definition}
+%\cs{TrackLangRequireDialect}\oarg{load code}\marg{pkgname}\marg{dialect}
+%\end{definition}
+%    \begin{macrocode}
+\def\TrackLangRequireDialect{\@TrackLangRequireDialect}
+%    \end{macrocode}
+%\end{macro}
+%\begin{macro}{\noop@TrackLangRequireDialect}
+%\changes{1.3}{2016-10-07}{new}
+%No-op code.
+%    \begin{macrocode}
+\def\noop@TrackLangRequireDialect#1{%
+  \ifx[#1\relax
+    \def\@tracklang@next{\@noop@TrackLangRequireDialect[}%
+  \else
+    \def\@tracklang@next{\@noop@TrackLangRequireDialect[]{#1}}%
+  \fi
+  \@tracklang@next
+}
+\def\@noop@TrackLangRequireDialect[#1]#2#3{%
+  \@tracklang@err{\string\TrackLangRequireDialect\space
+  only permitted within resource files}
+}
+%    \end{macrocode}
+%\end{macro}
+%\begin{macro}{\@TrackLangRequireDialect}
+%\changes{1.3}{2016-10-07}{new}
+%Actual code.
+%    \begin{macrocode}
+\def\@TrackLangRequireDialect#1{%
+  \ifx[#1\relax
+    \def\@tracklang@next{\@@TrackLangRequireDialect[}%
+  \else
+    \def\@tracklang@next{%
+      \@@TrackLangRequireDialect
+        [\TrackLangRequireResource{\CurrentTrackedTag}]{#1}}%
+  \fi
+  \@tracklang@next
+}
+\def\@@TrackLangRequireDialect[#1]#2#3{%
+   \def\TrackLangRequireDialectPrefix{#2}%
+   \IfTrackedLanguageFileExists{#3}%
+   {#2-}% prefix
+   {.ldf}% suffix
+   {%
+%    \end{macrocode}
+%Enable \cs{TrackLangRequireResource} etc so that they can only be used in
+%resource files.
+%    \begin{macrocode}
+     \let\TrackLangRequireResource\@TrackLangRequireResource
+     \let\TrackLangRequireResourceOrDo\@TrackLangRequireResourceOrDo
+     \let\TrackLangRequestResource\@TrackLangRequestResource
+%    \end{macrocode}
+%Disable \cs{TrackLangRequireDialect} so that it can't be used in
+%resource files.
+%    \begin{macrocode}
+     \let\TrackLangRequireDialect\noop@TrackLangRequireDialect
+%    \end{macrocode}
+%Enable \cs{TrackLangAddToHook}.
+%    \begin{macrocode}
+     \let\TrackLangAddToHook\@TrackLangAddToHook
+%    \end{macrocode}
+%Load resource file using the code provided in the first argument.
+%    \begin{macrocode}
+     #1%
+%    \end{macrocode}
+%Disable \cs{TrackLangRequireResource} etc.
+%    \begin{macrocode}
+     \let\TrackLangRequireResource\noop@TrackLangRequireResource
+     \let\TrackLangRequireResourceOrDo\noop@TrackLangRequireResourceOrDo
+     \let\TrackLangRequestResource\noop@TrackLangRequestResource
+%    \end{macrocode}
+%Enable \cs{TrackLangRequireDialect}.
+%    \begin{macrocode}
+     \let\TrackLangRequireDialect\@TrackLangRequireDialect
+%    \end{macrocode}
+%Disable \cs{TrackLangAddToHook}.
+%    \begin{macrocode}
+     \let\TrackLangAddToHook\noop@TrackLangAddToHook
+   }%
+   {%
+     \@tracklang@warn{No `#2' support for dialect `#3'}%
+   }%
+}
+%    \end{macrocode}
+%\end{macro}
+%
+%Restore category code for \texttt{@} if necessary.
+%    \begin{macrocode}
+\@tracklang@restore@at
+%    \end{macrocode}
+%\iffalse
+%    \begin{macrocode}
+%</tracklang.tex>
+%    \end{macrocode}
+%\fi
+%\iffalse
+%    \begin{macrocode}
+%<*tracklang-region-codes.tex>
+%    \end{macrocode}
+%\fi
+%\section{Regions Generic Code (\texttt{tracklang-region-codes.tex})}
+%This is only loaded if a mapping is required between 
+%numeric and alphabetic region codes. (It would slow down the
+%package loading to automatically load if not required.)
+%Since this is loaded on the fly, we need to be careful about
+%spurious spaces.
+%\changes{1.3}{2016-10-07}{added tracklang-region-codes.tex}
+%    \begin{macrocode}
+\ifnum\catcode`\@=11\relax
+  \def\@tracklang@regions@restore@at{}%
+\else
+  \expandafter\edef\csname @tracklang@regions@restore@at\endcsname{%
+    \noexpand\catcode`\noexpand\@=\number\catcode`\@\relax
+  }%
+ \catcode`\@=11\relax
+\fi
+%    \end{macrocode}
+% Check if this file has already been loaded:
+%    \begin{macrocode}
+\ifx\TrackLangRegionMap\undefined
+\else
+  \@tracklang@regions@restore@at
+  \expandafter\endinput
+\fi
+%    \end{macrocode}
+% Version info.
+%    \begin{macrocode}
+\expandafter\def\csname ver@tracklang-region-codes.tex\endcsname{%
+ 2019/08/31 v1.3.7 (NLCT) Track Languages Regions}%
+%    \end{macrocode}
+%
+%\begin{macro}{\TrackLangRegionMap}
+%\changes{1.3}{2016-10-07}{new}
+%\begin{definition}
+%\cs{TrackLangRegionMap}\marg{numeric code}\marg{alpha-2
+%code}\marg{alpha-3 code}
+%\end{definition}
+%Define mapping.
+%    \begin{macrocode}
+\def\TrackLangRegionMap#1#2#3{%
+  \@tracklang@enamedef{@tracklang@region@numtoalphaii@#1}{#2}%
+  \@tracklang@enamedef{@tracklang@region@numtoalphaiii@#1}{#3}%
+  \@tracklang@enamedef{@tracklang@region@alphaiitonum@#2}{#1}%
+  \@tracklang@enamedef{@tracklang@region@alphaiiitonum@#3}{#1}%
+  \@tracklang@enamedef{@tracklang@region@alphaiitoalphaiii@#2}{#3}%
+  \@tracklang@enamedef{@tracklang@region@alphaiiitoalphaii@#3}{#2}%
+}%
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\TrackLangAlphaIIToNumericRegion}
+%\begin{definition}
+%\cs{TrackLangAlphaIIToNumericRegion}\marg{alpha-2 code}
+%\end{definition}
+%\changes{1.3}{2016-10-07}{new}
+%    \begin{macrocode}
+\def\TrackLangAlphaIIToNumericRegion#1{%
+  \@tracklang@nameuse{@tracklang@region@alphaiitonum@#1}%
+}%
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\TrackLangNumericToAlphaIIRegion}
+%\begin{definition}
+%\cs{TrackLangNumericToAlphaIIRegion}\marg{numeric code}
+%\end{definition}
+%\changes{1.3}{2016-10-07}{new}
+%    \begin{macrocode}
+\def\TrackLangNumericToAlphaIIRegion#1{%
+  \@tracklang@nameuse{@tracklang@region@numtoalphaii@#1}%
+}%
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\TrackLangIfKnownAlphaIIRegion}
+%\begin{definition}
+%\cs{TrackLangIfKnownAlphaIIRegion}\marg{alpha-2
+%code}\marg{true}\marg{false}
+%\end{definition}
+%\changes{1.3}{2016-10-07}{new}
+%    \begin{macrocode}
+\def\TrackLangIfKnownAlphaIIRegion#1#2#3{%
+  \@tracklang@ifundef{@tracklang@region@alphaiitonum@#1}%
+  {#3}%
+  {#2}%
+}%
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\TrackLangIfKnownNumericRegion}
+%\begin{definition}
+%\cs{TrackLangIfKnownNumericRegion}\marg{numeric
+%code}\marg{true}\marg{false}
+%\end{definition}
+%\changes{1.3}{2016-10-07}{new}
+%    \begin{macrocode}
+\def\TrackLangIfKnownNumericRegion#1#2#3{%
+  \@tracklang@ifundef{@tracklang@region@numtoalphaii@#1}%
+  {#3}%
+  {#2}%
+}%
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\TrackLangAlphaIIIToNumericRegion}
+%\begin{definition}
+%\cs{TrackLangAlphaIIIToNumericRegion}\marg{alpha-3 code}
+%\end{definition}
+%\changes{1.3}{2016-10-07}{new}
+%    \begin{macrocode}
+\def\TrackLangAlphaIIIToNumericRegion#1{%
+  \@tracklang@nameuse{@tracklang@region@alphaiiitonum@#1}%
+}%
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\TrackLangNumericToAlphaIIIRegion}
+%\begin{definition}
+%\cs{TrackLangNumericToAlphaIIIRegion}\marg{numeric code}
+%\end{definition}
+%\changes{1.3}{2016-10-07}{new}
+%    \begin{macrocode}
+\def\TrackLangNumericToAlphaIIIRegion#1{%
+  \@tracklang@nameuse{@tracklang@region@numtoalphaiii@#1}%
+}%
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\TrackLangIfKnownAlphaIIIRegion}
+%\begin{definition}
+%\cs{TrackLangIfKnownAlphaIIIRegion}\marg{alpha-3
+%code}\marg{true}\marg{false}
+%\end{definition}
+%\changes{1.3}{2016-10-07}{new}
+%    \begin{macrocode}
+\def\TrackLangIfKnownAlphaIIIRegion#1#2#3{%
+  \@tracklang@ifundef{@tracklang@region@alphaiiitonum@#1}%
+  {#3}%
+  {#2}%
+}%
+%    \end{macrocode}
+%\end{macro}
+%
+%Define mappings.
+%    \begin{macrocode}
+\TrackLangRegionMap{004}{AF}{AFG}%
+\TrackLangRegionMap{248}{AX}{ALA}%
+\TrackLangRegionMap{008}{AL}{ALB}%
+\TrackLangRegionMap{012}{DZ}{DZA}%
+\TrackLangRegionMap{016}{AS}{ASM}%
+\TrackLangRegionMap{020}{AD}{AND}%
+\TrackLangRegionMap{024}{AO}{AGO}%
+\TrackLangRegionMap{660}{AI}{AIA}%
+\TrackLangRegionMap{010}{AQ}{ATA}%
+\TrackLangRegionMap{028}{AG}{ATG}%
+\TrackLangRegionMap{032}{AR}{ARG}%
+\TrackLangRegionMap{051}{AM}{ARM}%
+\TrackLangRegionMap{533}{AW}{ABW}%
+\TrackLangRegionMap{036}{AU}{AUS}%
+\TrackLangRegionMap{040}{AT}{AUT}%
+\TrackLangRegionMap{031}{AZ}{AZE}%
+\TrackLangRegionMap{044}{BS}{BHS}%
+\TrackLangRegionMap{048}{BH}{BHR}%
+\TrackLangRegionMap{050}{BD}{BGD}%
+\TrackLangRegionMap{052}{BB}{BRB}%
+\TrackLangRegionMap{112}{BY}{BLR}%
+\TrackLangRegionMap{056}{BE}{BEL}%
+\TrackLangRegionMap{084}{BZ}{BLZ}%
+\TrackLangRegionMap{204}{BJ}{BEN}%
+\TrackLangRegionMap{060}{BM}{BMU}%
+\TrackLangRegionMap{064}{BT}{BTN}%
+\TrackLangRegionMap{068}{BO}{BOL}%
+\TrackLangRegionMap{535}{BQ}{BES}%
+\TrackLangRegionMap{070}{BA}{BIH}%
+\TrackLangRegionMap{072}{BW}{BWA}%
+\TrackLangRegionMap{074}{BV}{BVT}%
+\TrackLangRegionMap{076}{BR}{BRA}%
+\TrackLangRegionMap{086}{IO}{IOT}%
+\TrackLangRegionMap{096}{BN}{BRN}%
+\TrackLangRegionMap{100}{BG}{BGR}%
+\TrackLangRegionMap{854}{BF}{BFA}%
+\TrackLangRegionMap{108}{BI}{BDI}%
+\TrackLangRegionMap{132}{CV}{CPV}%
+\TrackLangRegionMap{116}{KH}{KHM}%
+\TrackLangRegionMap{120}{CM}{CMR}%
+\TrackLangRegionMap{124}{CA}{CAN}%
+\TrackLangRegionMap{136}{KY}{CYM}%
+\TrackLangRegionMap{140}{CF}{CAF}%
+\TrackLangRegionMap{148}{TD}{TCD}%
+\TrackLangRegionMap{152}{CL}{CHL}%
+\TrackLangRegionMap{156}{CN}{CHN}%
+\TrackLangRegionMap{162}{CX}{CXR}%
+\TrackLangRegionMap{166}{CC}{CCK}%
+\TrackLangRegionMap{170}{CO}{COL}%
+\TrackLangRegionMap{174}{KM}{COM}%
+\TrackLangRegionMap{180}{CD}{COD}%
+\TrackLangRegionMap{178}{CG}{COG}%
+\TrackLangRegionMap{184}{CK}{COK}%
+\TrackLangRegionMap{188}{CR}{CRI}%
+\TrackLangRegionMap{384}{CI}{CIV}%
+\TrackLangRegionMap{191}{HR}{HRV}%
+\TrackLangRegionMap{192}{CU}{CUB}%
+\TrackLangRegionMap{531}{CW}{CUW}%
+\TrackLangRegionMap{196}{CY}{CYP}%
+\TrackLangRegionMap{203}{CZ}{CZE}%
+\TrackLangRegionMap{208}{DK}{DNK}%
+\TrackLangRegionMap{262}{DJ}{DJI}%
+\TrackLangRegionMap{212}{DM}{DMA}%
+\TrackLangRegionMap{214}{DO}{DOM}%
+\TrackLangRegionMap{218}{EC}{ECU}%
+\TrackLangRegionMap{818}{EG}{EGY}%
+\TrackLangRegionMap{222}{SV}{SLV}%
+\TrackLangRegionMap{226}{GQ}{GNQ}%
+\TrackLangRegionMap{232}{ER}{ERI}%
+\TrackLangRegionMap{233}{EE}{EST}%
+\TrackLangRegionMap{231}{ET}{ETH}%
+\TrackLangRegionMap{238}{FK}{FLK}%
+\TrackLangRegionMap{234}{FO}{FRO}%
+\TrackLangRegionMap{242}{FJ}{FJI}%
+\TrackLangRegionMap{246}{FI}{FIN}%
+\TrackLangRegionMap{250}{FR}{FRA}%
+\TrackLangRegionMap{254}{GF}{GUF}%
+\TrackLangRegionMap{258}{PF}{PYF}%
+\TrackLangRegionMap{260}{TF}{ATF}%
+\TrackLangRegionMap{266}{GA}{GAB}%
+\TrackLangRegionMap{270}{GM}{GMB}%
+\TrackLangRegionMap{268}{GE}{GEO}%
+\TrackLangRegionMap{276}{DE}{DEU}%
+\TrackLangRegionMap{288}{GH}{GHA}%
+\TrackLangRegionMap{292}{GI}{GIB}%
+\TrackLangRegionMap{300}{GR}{GRC}%
+\TrackLangRegionMap{304}{GL}{GRL}%
+\TrackLangRegionMap{308}{GD}{GRD}%
+\TrackLangRegionMap{312}{GP}{GLP}%
+\TrackLangRegionMap{316}{GU}{GUM}%
+\TrackLangRegionMap{320}{GT}{GTM}%
+\TrackLangRegionMap{831}{GG}{GGY}%
+\TrackLangRegionMap{324}{GN}{GIN}%
+\TrackLangRegionMap{624}{GW}{GNB}%
+\TrackLangRegionMap{328}{GY}{GUY}%
+\TrackLangRegionMap{332}{HT}{HTI}%
+\TrackLangRegionMap{334}{HM}{HMD}%
+\TrackLangRegionMap{336}{VA}{VAT}%
+\TrackLangRegionMap{340}{HN}{HND}%
+\TrackLangRegionMap{344}{HK}{HKG}%
+\TrackLangRegionMap{348}{HU}{HUN}%
+\TrackLangRegionMap{352}{IS}{ISL}%
+\TrackLangRegionMap{356}{IN}{IND}%
+\TrackLangRegionMap{360}{ID}{IDN}%
+\TrackLangRegionMap{364}{IR}{IRN}%
+\TrackLangRegionMap{368}{IQ}{IRQ}%
+\TrackLangRegionMap{372}{IE}{IRL}%
+\TrackLangRegionMap{833}{IM}{IMN}%
+\TrackLangRegionMap{376}{IL}{ISR}%
+\TrackLangRegionMap{380}{IT}{ITA}%
+\TrackLangRegionMap{388}{JM}{JAM}%
+\TrackLangRegionMap{392}{JP}{JPN}%
+\TrackLangRegionMap{832}{JE}{JEY}%
+\TrackLangRegionMap{400}{JO}{JOR}%
+\TrackLangRegionMap{398}{KZ}{KAZ}%
+\TrackLangRegionMap{404}{KE}{KEN}%
+\TrackLangRegionMap{296}{KI}{KIR}%
+\TrackLangRegionMap{408}{KP}{PRK}%
+\TrackLangRegionMap{410}{KR}{KOR}%
+\TrackLangRegionMap{414}{KW}{KWT}%
+\TrackLangRegionMap{417}{KG}{KGZ}%
+\TrackLangRegionMap{418}{LA}{LAO}%
+\TrackLangRegionMap{428}{LV}{LVA}%
+\TrackLangRegionMap{422}{LB}{LBN}%
+\TrackLangRegionMap{426}{LS}{LSO}%
+\TrackLangRegionMap{430}{LR}{LBR}%
+\TrackLangRegionMap{434}{LY}{LBY}%
+\TrackLangRegionMap{438}{LI}{LIE}%
+\TrackLangRegionMap{440}{LT}{LTU}%
+\TrackLangRegionMap{442}{LU}{LUX}%
+\TrackLangRegionMap{446}{MO}{MAC}%
+\TrackLangRegionMap{807}{MK}{MKD}%
+\TrackLangRegionMap{450}{MG}{MDG}%
+\TrackLangRegionMap{454}{MW}{MWI}%
+\TrackLangRegionMap{458}{MY}{MYS}%
+\TrackLangRegionMap{462}{MV}{MDV}%
+\TrackLangRegionMap{466}{ML}{MLI}%
+\TrackLangRegionMap{470}{MT}{MLT}%
+\TrackLangRegionMap{584}{MH}{MHL}%
+\TrackLangRegionMap{474}{MQ}{MTQ}%
+\TrackLangRegionMap{478}{MR}{MRT}%
+\TrackLangRegionMap{480}{MU}{MUS}%
+\TrackLangRegionMap{175}{YT}{MYT}%
+\TrackLangRegionMap{484}{MX}{MEX}%
+\TrackLangRegionMap{583}{FM}{FSM}%
+\TrackLangRegionMap{498}{MD}{MDA}%
+\TrackLangRegionMap{492}{MC}{MCO}%
+\TrackLangRegionMap{496}{MN}{MNG}%
+\TrackLangRegionMap{499}{ME}{MNE}%
+\TrackLangRegionMap{500}{MS}{MSR}%
+\TrackLangRegionMap{504}{MA}{MAR}%
+\TrackLangRegionMap{508}{MZ}{MOZ}%
+\TrackLangRegionMap{104}{MM}{MMR}%
+\TrackLangRegionMap{516}{NA}{NAM}%
+\TrackLangRegionMap{520}{NR}{NRU}%
+\TrackLangRegionMap{524}{NP}{NPL}%
+\TrackLangRegionMap{528}{NL}{NLD}%
+\TrackLangRegionMap{540}{NC}{NCL}%
+\TrackLangRegionMap{554}{NZ}{NZL}%
+\TrackLangRegionMap{558}{NI}{NIC}%
+\TrackLangRegionMap{562}{NE}{NER}%
+\TrackLangRegionMap{566}{NG}{NGA}%
+\TrackLangRegionMap{570}{NU}{NIU}%
+\TrackLangRegionMap{574}{NF}{NFK}%
+\TrackLangRegionMap{580}{MP}{MNP}%
+\TrackLangRegionMap{578}{NO}{NOR}%
+\TrackLangRegionMap{512}{OM}{OMN}%
+\TrackLangRegionMap{586}{PK}{PAK}%
+\TrackLangRegionMap{585}{PW}{PLW}%
+\TrackLangRegionMap{275}{PS}{PSE}%
+\TrackLangRegionMap{591}{PA}{PAN}%
+\TrackLangRegionMap{598}{PG}{PNG}%
+\TrackLangRegionMap{600}{PY}{PRY}%
+\TrackLangRegionMap{604}{PE}{PER}%
+\TrackLangRegionMap{608}{PH}{PHL}%
+\TrackLangRegionMap{612}{PN}{PCN}%
+\TrackLangRegionMap{616}{PL}{POL}%
+\TrackLangRegionMap{620}{PT}{PRT}%
+\TrackLangRegionMap{630}{PR}{PRI}%
+\TrackLangRegionMap{634}{QA}{QAT}%
+\TrackLangRegionMap{638}{RE}{REU}%
+\TrackLangRegionMap{642}{RO}{ROU}%
+\TrackLangRegionMap{643}{RU}{RUS}%
+\TrackLangRegionMap{646}{RW}{RWA}%
+\TrackLangRegionMap{652}{BL}{BLM}%
+\TrackLangRegionMap{654}{SH}{SHN}%
+\TrackLangRegionMap{659}{KN}{KNA}%
+\TrackLangRegionMap{662}{LC}{LCA}%
+\TrackLangRegionMap{663}{MF}{MAF}%
+\TrackLangRegionMap{666}{PM}{SPM}%
+\TrackLangRegionMap{670}{VC}{VCT}%
+\TrackLangRegionMap{882}{WS}{WSM}%
+\TrackLangRegionMap{674}{SM}{SMR}%
+\TrackLangRegionMap{678}{ST}{STP}%
+\TrackLangRegionMap{682}{SA}{SAU}%
+\TrackLangRegionMap{686}{SN}{SEN}%
+\TrackLangRegionMap{688}{RS}{SRB}%
+\TrackLangRegionMap{690}{SC}{SYC}%
+\TrackLangRegionMap{694}{SL}{SLE}%
+\TrackLangRegionMap{702}{SG}{SGP}%
+\TrackLangRegionMap{534}{SX}{SXM}%
+\TrackLangRegionMap{703}{SK}{SVK}%
+\TrackLangRegionMap{705}{SI}{SVN}%
+\TrackLangRegionMap{090}{SB}{SLB}%
+\TrackLangRegionMap{706}{SO}{SOM}%
+\TrackLangRegionMap{710}{ZA}{ZAF}%
+\TrackLangRegionMap{239}{GS}{SGS}%
+\TrackLangRegionMap{728}{SS}{SSD}%
+\TrackLangRegionMap{724}{ES}{ESP}%
+\TrackLangRegionMap{144}{LK}{LKA}%
+\TrackLangRegionMap{729}{SD}{SDN}%
+\TrackLangRegionMap{740}{SR}{SUR}%
+\TrackLangRegionMap{744}{SJ}{SJM}%
+\TrackLangRegionMap{748}{SZ}{SWZ}%
+\TrackLangRegionMap{752}{SE}{SWE}%
+\TrackLangRegionMap{756}{CH}{CHE}%
+\TrackLangRegionMap{760}{SY}{SYR}%
+\TrackLangRegionMap{158}{TW}{TWN}%
+\TrackLangRegionMap{762}{TJ}{TJK}%
+\TrackLangRegionMap{834}{TZ}{TZA}%
+\TrackLangRegionMap{764}{TH}{THA}%
+\TrackLangRegionMap{626}{TL}{TLS}%
+\TrackLangRegionMap{768}{TG}{TGO}%
+\TrackLangRegionMap{772}{TK}{TKL}%
+\TrackLangRegionMap{776}{TO}{TON}%
+\TrackLangRegionMap{780}{TT}{TTO}%
+\TrackLangRegionMap{788}{TN}{TUN}%
+\TrackLangRegionMap{792}{TR}{TUR}%
+\TrackLangRegionMap{795}{TM}{TKM}%
+\TrackLangRegionMap{796}{TC}{TCA}%
+\TrackLangRegionMap{798}{TV}{TUV}%
+\TrackLangRegionMap{800}{UG}{UGA}%
+\TrackLangRegionMap{804}{UA}{UKR}%
+\TrackLangRegionMap{784}{AE}{ARE}%
+\TrackLangRegionMap{826}{GB}{GBR}%
+\TrackLangRegionMap{581}{UM}{UMI}%
+\TrackLangRegionMap{840}{US}{USA}%
+\TrackLangRegionMap{858}{UY}{URY}%
+\TrackLangRegionMap{860}{UZ}{UZB}%
+\TrackLangRegionMap{548}{VU}{VUT}%
+\TrackLangRegionMap{862}{VE}{VEN}%
+\TrackLangRegionMap{704}{VN}{VNM}%
+\TrackLangRegionMap{092}{VG}{VGB}%
+\TrackLangRegionMap{850}{VI}{VIR}%
+\TrackLangRegionMap{876}{WF}{WLF}%
+\TrackLangRegionMap{732}{EH}{ESH}%
+\TrackLangRegionMap{887}{YE}{YEM}%
+\TrackLangRegionMap{894}{ZM}{ZMB}%
+\TrackLangRegionMap{716}{ZW}{ZWE}%
+%    \end{macrocode}
+%
+%Restore category code of \texttt{@}.
+%    \begin{macrocode}
+\@tracklang@regions@restore@at
+%    \end{macrocode}
+%\iffalse
+%    \begin{macrocode}
+%</tracklang-region-codes.tex>
+%    \end{macrocode}
+%\fi
+%\iffalse
+%    \begin{macrocode}
+%<*tracklang-scripts.sty>
+%    \end{macrocode}
+%\fi
+%\section{ISO 15924 Scripts \LaTeX\ Package
+%(\texttt{tracklang-scripts.sty})}
+%This is just a \LaTeX\ package wrapper for the generic code in
+%\texttt{tracklang-scripts.tex}.
+%\changes{1.3}{2016-10-07}{added tracklang-scripts.sty}
+%    \begin{macrocode}
+\NeedsTeXFormat{LaTeX2e}
+\ProvidesPackage{tracklang-scripts}[2019/08/31 v1.3.7 (NLCT) Track
+Language Scripts (LaTeX)]
+\RequirePackage{tracklang}
+\input{tracklang-scripts}
+%    \end{macrocode}
+%\iffalse
+%    \begin{macrocode}
+%</tracklang-scripts.sty>
+%    \end{macrocode}
+%\fi
+%\iffalse
+%    \begin{macrocode}
+%<*tracklang-scripts.tex>
+%    \end{macrocode}
+%\fi
+%\section{ISO 15924 Scripts Generic Code
+%(\texttt{tracklang-scripts.tex})}
+%\label{sec:tracklang-scripts.tex}
+%Provides information about ISO 15924 scripts. Not automatically
+%loaded.
+%\changes{1.3}{2016-10-07}{added tracklang-scripts.tex}
+%    \begin{macrocode}
+\ifnum\catcode`\@=11\relax
+  \def\@tracklang@scripts@restore@at{}%
+\else
+  \expandafter\edef\csname @tracklang@scripts@restore@at\endcsname{%
+    \noexpand\catcode`\noexpand\@=\number\catcode`\@\relax
+  }%
+ \catcode`\@=11\relax
+\fi
+%    \end{macrocode}
+% Check if this file has already been loaded:
+%    \begin{macrocode}
+\ifx\TrackLangScriptMap\undefined
+\else
+  \@tracklang@scripts@restore@at
+  \expandafter\endinput
+\fi
+%    \end{macrocode}
+% Version info.
+%    \begin{macrocode}
+\expandafter\def\csname ver@tracklang-scripts.tex\endcsname{%
+ 2019/08/31 v1.3.7 (NLCT) Track Languages Scripts (Generic)}%
+%    \end{macrocode}
+%
+%\begin{macro}{\TrackLangScriptsMap}
+%\changes{1.3}{2016-10-07}{new}
+%\begin{definition}
+%\cs{TrackLangScriptMap}\marg{letter
+%code}\marg{number}\marg{name}\marg{direction}\marg{parent}
+%\end{definition}
+%Define mapping. To avoid problems with encodings, only use ASCII
+%characters in the arguments. The first argument is the four-letter
+%ISO 15924 code. The second argument is the numeric code. The third
+%argument is just intended for informational purposes. The fourth
+%argument indicates the direction. This may be \texttt{LR}
+%(left-to-right), \texttt{RL} (right-to-left), \texttt{TB}
+%(top-to-bottom), \texttt{varies} or \texttt{inherited}.
+%The \meta{parent} argument is for the parent writing system, which
+%may be left blank. (Currently, this is blank for all the mappings
+%provided here, but the syntax has five arguments in case of future
+%development.)
+%    \begin{macrocode}
+\def\TrackLangScriptMap#1#2#3#4#5{%
+%    \end{macrocode}
+%This user command is provided to make it easier to test the script
+%using \cs{ifx}.
+%    \begin{macrocode}
+  \@tracklang@enamedef{TrackLangScript#1}{#1}%
+  \@tracklang@enamedef{@tracklang@script@numtoalpha@#2}{#1}%
+  \@tracklang@enamedef{@tracklang@script@alphatonum@#1}{#2}%
+  \@tracklang@enamedef{@tracklang@script@alphatoname@#1}{#3}%
+  \@tracklang@enamedef{@tracklang@script@alphatodir@#1}{#4}%
+  \ifx\relax#5\relax
+  \else
+    \@tracklang@enamedef{@tracklang@script@parent@#1}{#5}%
+  \fi
+}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\TrackLangScriptAlphaToNumeric}
+%\begin{definition}
+%\cs{TrackLangScriptAlphaToNumeric}\marg{alpha code}
+%\end{definition}
+%\changes{1.3}{2016-10-07}{new}
+%    \begin{macrocode}
+\def\TrackLangScriptAlphaToNumeric#1{%
+  \@tracklang@nameuse{@tracklang@script@alphatonum@#1}%
+}%
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\TrackLangScriptIfKnownAlpha}
+%\begin{definition}
+%\cs{TrackLangScriptIfKnownAlpha}\marg{alpha
+%code}\marg{true}\marg{false}
+%\end{definition}
+%\changes{1.3}{2016-10-07}{new}
+%    \begin{macrocode}
+\def\TrackLangScriptIfKnownAlpha#1#2#3{%
+  \@tracklang@ifundef{@tracklang@script@alphatonum@#1}%
+  {#3}%
+  {#2}%
+}%
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\TrackLangScriptNumericToAlpha}
+%\begin{definition}
+%\cs{TrackLangScriptNumericToAlpha}\marg{numeric code}
+%\end{definition}
+%\changes{1.3}{2016-10-07}{new}
+%    \begin{macrocode}
+\def\TrackLangScriptNumericToAlpha#1{%
+  \@tracklang@nameuse{@tracklang@script@numtoalpha@#1}%
+}%
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\TrackLangScriptIfKnownNumeric}
+%\begin{definition}
+%\cs{TrackLangScriptIfKnownNumeric}\marg{numeric
+%code}\marg{true}\marg{false}
+%\end{definition}
+%\changes{1.3}{2016-10-07}{new}
+%    \begin{macrocode}
+\def\TrackLangScriptIfKnownNumeric#1#2#3{%
+  \@tracklang@ifundef{@tracklang@script@numtoalpha@#1}%
+  {#3}%
+  {#2}%
+}%
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\TrackLangScriptAlphaToName}
+%\begin{definition}
+%\cs{TrackLangScriptAlphaToName}\marg{alpha code}
+%\end{definition}
+%\changes{1.3}{2016-10-07}{new}
+%    \begin{macrocode}
+\def\TrackLangScriptAlphaToName#1{%
+  \@tracklang@nameuse{@tracklang@script@alphatoname@#1}%
+}%
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\TrackLangScriptAlphaToDir}
+%\begin{definition}
+%\cs{TrackLangScriptAlphaToDir}\marg{alpha code}
+%\end{definition}
+%\changes{1.3}{2016-10-07}{new}
+%    \begin{macrocode}
+\def\TrackLangScriptAlphaToDir#1{%
+  \@tracklang@nameuse{@tracklang@script@alphatodir@#1}%
+}%
+%    \end{macrocode}
+%\end{macro}
+%
+%I wasn't sure whether or not to implement a parent, but it's here
+%if required. Unlike the other elements above, there's also a
+%command to set this field.
+%\begin{macro}{\TrackLangScriptSetParent}
+%\begin{definition}
+%\cs{TrackLangScriptSetParent}\marg{alpha code}\marg{parent alpha
+%code}
+%\end{definition}
+%\changes{1.3}{2016-10-07}{new}
+%    \begin{macrocode}
+\def\TrackLangScriptSetParent#1#2{%
+  \@tracklang@enamedef{@tracklang@script@parent@#1}{#2}%
+}%
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\TrackLangScriptGetParent}
+%\begin{definition}
+%\cs{TrackLangScriptGetParent}\marg{alpha code}
+%\end{definition}
+%\changes{1.3}{2016-10-07}{new}
+%    \begin{macrocode}
+\def\TrackLangScriptGetParent#1{%
+  \@tracklang@nameuse{@tracklang@script@parent@#1}%
+}%
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\TrackLangScriptIfHasParent}
+%\begin{definition}
+%\cs{TrackLangScriptIfHasParent}\marg{alpha
+%code}\marg{true}\marg{false}
+%\end{definition}
+%\changes{1.3}{2016-10-07}{new}
+%    \begin{macrocode}
+\def\TrackLangScriptIfHasParent#1#2#3{%
+  \@tracklang@ifundef{@tracklang@script@parent@#1}%
+  {#3}%
+  {#2}%
+}%
+%    \end{macrocode}
+%\end{macro}
+%
+%Define mappings. The parent information is currently missing.
+%    \begin{macrocode}
+\TrackLangScriptMap{Adlm}{166}{Adlam}{RL}{}
+\TrackLangScriptMap{Afak}{439}{Afaka}{varies}{}
+\TrackLangScriptMap{Aghb}{239}{Caucasian Albanian}{LR}{}
+\TrackLangScriptMap{Ahom}{338}{Ahom, Tai Ahom}{LR}{}
+\TrackLangScriptMap{Arab}{160}{Arabic}{RL}{}
+\TrackLangScriptMap{Aran}{161}{Arabic (Nastaliq variant)}{RL}{}
+\TrackLangScriptMap{Armi}{124}{Imperial Aramaic}{RL}{}
+\TrackLangScriptMap{Armn}{230}{Armenian}{LR}{}
+\TrackLangScriptMap{Avst}{134}{Avestan}{RL}{}
+\TrackLangScriptMap{Bali}{360}{Balinese}{LR}{}
+\TrackLangScriptMap{Bamu}{435}{Bamum}{LR}{}
+\TrackLangScriptMap{Bass}{259}{Bassa Vah}{LR}{}
+\TrackLangScriptMap{Batk}{365}{Batak}{LR}{}
+\TrackLangScriptMap{Beng}{334}{Bhaiksuki}{LR}{}
+\TrackLangScriptMap{Blis}{550}{Blissymbols}{varies}{}
+\TrackLangScriptMap{Bopo}{285}{Bopomofo}{LR}{}
+\TrackLangScriptMap{Brah}{300}{Brahmi}{LR}{}
+\TrackLangScriptMap{Brai}{570}{Braille}{LR}{}
+\TrackLangScriptMap{Bugi}{367}{Buginese}{LR}{}
+\TrackLangScriptMap{Buhd}{372}{Buhid}{LR}{}
+\TrackLangScriptMap{Cakm}{349}{Chakma}{LR}{}
+\TrackLangScriptMap{Cans}{440}{Unified Canadian Aboriginal Syllabics}{LR}{}
+\TrackLangScriptMap{Cari}{201}{Carian}{LR}{}
+\TrackLangScriptMap{Cham}{358}{Cham}{LR}{}
+\TrackLangScriptMap{Cher}{445}{Cherokee}{LR}{}
+\TrackLangScriptMap{Cirt}{291}{Cirth}{varies}{}
+\TrackLangScriptMap{Copt}{204}{Coptic}{LR}{}
+\TrackLangScriptMap{Cprt}{403}{Cypriot}{RL}{}
+\TrackLangScriptMap{Cyrl}{220}{Cyrillic}{LR}{}
+\TrackLangScriptMap{Cyrs}{221}{Cyrillic (Old Church Slavonic{}
+variant)}{varies}{}
+\TrackLangScriptMap{Deva}{315}{Devanagari (Nagari)}{LR}{}
+\TrackLangScriptMap{Dsrt}{250}{Deseret (Mormon)}{LR}{}
+\TrackLangScriptMap{Dupl}{755}{Duployan shorthand, Duployan{}
+stenography}{LR}{}
+\TrackLangScriptMap{Egyd}{070}{Egyptian demotic}{RL}{}
+\TrackLangScriptMap{Egyh}{060}{Egyptian hieratic}{RL}{}
+\TrackLangScriptMap{Egyp}{050}{Egyptian hieroglyphs}{LR}{}
+\TrackLangScriptMap{Elba}{226}{Elbasan}{LR}{}
+\TrackLangScriptMap{Ethi}{430}{Ethiopic (Ge'ez)}{LR}{}
+\TrackLangScriptMap{Geok}{241}{Khutsuri (Asomtavruli and{}
+Nuskhuri)}{LR}{}
+\TrackLangScriptMap{Geor}{240}{Georgian (Mkhedruli)}{LR}{}
+\TrackLangScriptMap{Glag}{225}{Glagolitic}{LR}{}
+\TrackLangScriptMap{Goth}{206}{Gothic}{LR}{}
+\TrackLangScriptMap{Gran}{343}{Grantha}{LR}{}
+\TrackLangScriptMap{Grek}{200}{Greek}{LR}{}
+\TrackLangScriptMap{Gujr}{320}{Gujarati}{LR}{}
+\TrackLangScriptMap{Guru}{310}{Gurmukhi}{LR}{}
+\TrackLangScriptMap{Hanb}{503}{Han with Bopomofo (alias for Han +{}
+Bopomofo)}{LR}{}
+\TrackLangScriptMap{Hang}{286}{Hangul}{LR}{}
+\TrackLangScriptMap{Hani}{500}{Han (Hanzi, Kanji, Hanja)}{LR}{}
+\TrackLangScriptMap{Hano}{371}{Hanunoo}{LR}{}
+\TrackLangScriptMap{Hans}{501}{Han (Simplified variant)}{varies}{}
+\TrackLangScriptMap{Hant}{502}{Han (Traditional variant)}{varies}{}
+\TrackLangScriptMap{Hatr}{127}{Hatran}{RL}{}
+\TrackLangScriptMap{Hebr}{125}{Hebrew}{RL}{}
+\TrackLangScriptMap{Hira}{410}{Hiragana}{LR}{}
+\TrackLangScriptMap{Hluw}{080}{Anatolian Hieroglyphs (Luwian{}
+Hieroglyphs, Hittite Hieroglyphs)}{LR}{}
+\TrackLangScriptMap{Hmng}{450}{Pahawh Hmong}{LR}{}
+\TrackLangScriptMap{Hrkt}{412}{Japanese syllabaries (alias for{}
+Hiragana + Katakana)}{varies}{}
+\TrackLangScriptMap{Hung}{176}{Old Hungarian (Hungarian Runic)}{RL}{}
+\TrackLangScriptMap{Inds}{610}{Indus (Harappan)}{RL}{}
+\TrackLangScriptMap{Ital}{210}{Old Italic (Etruscan, Oscan, etc.)}{LR}{}
+\TrackLangScriptMap{Jamo}{284}{Jamo (alias for Jamo subset of{}
+Hangul)}{LR}{}
+\TrackLangScriptMap{Java}{361}{Javanese}{LR}{}
+\TrackLangScriptMap{Jpan}{413}{Japanese (alias for Han + Hiragana +{}
+Katakana)}{varies}{}
+\TrackLangScriptMap{Jurc}{510}{Jurchen}{LR}{}
+\TrackLangScriptMap{Kali}{357}{Kayah Li}{LR}{}
+\TrackLangScriptMap{Kana}{411}{Katakana}{LR}{}
+\TrackLangScriptMap{Khar}{305}{Kharoshthi}{RL}{}
+\TrackLangScriptMap{Khmr}{355}{Khmer}{LR}{}
+\TrackLangScriptMap{Khoj}{322}{Khojki}{LR}{}
+\TrackLangScriptMap{Kitl}{505}{Khitan large script}{LR}{}
+\TrackLangScriptMap{Kits}{288}{Khitan small script}{TB}{}
+\TrackLangScriptMap{Knda}{345}{Kannada}{LR}{}
+\TrackLangScriptMap{Kore}{287}{Korean (alias for Hangul + Han)}{LR}{}
+\TrackLangScriptMap{Kpel}{436}{Kpelle}{LR}{}
+\TrackLangScriptMap{Kthi}{317}{Kaithi}{LR}{}
+\TrackLangScriptMap{Lana}{351}{Tai Tham (Lanna)}{LR}{}
+\TrackLangScriptMap{Laoo}{356}{Lao}{LR}{}
+\TrackLangScriptMap{Latf}{217}{Latin (Fraktur variant)}{varies}{}
+\TrackLangScriptMap{Latg}{216}{Latin (Gaelic variant)}{LR}{}
+\TrackLangScriptMap{Latn}{215}{Latin}{LR}{}
+\TrackLangScriptMap{Leke}{364}{Leke}{LR}{}
+\TrackLangScriptMap{Lepc}{335}{Lepcha}{LR}{}
+\TrackLangScriptMap{Limb}{336}{Limbu}{LR}{}
+\TrackLangScriptMap{Lina}{400}{Linear A}{LR}{}
+\TrackLangScriptMap{Linb}{401}{Linear B}{LR}{}
+\TrackLangScriptMap{Lisu}{399}{Lisu (Fraser)}{LR}{}
+\TrackLangScriptMap{Loma}{437}{Loma}{LR}{}
+\TrackLangScriptMap{Lyci}{202}{Lycian}{LR}{}
+\TrackLangScriptMap{Lydi}{116}{Lydian}{RL}{}
+\TrackLangScriptMap{Mahj}{314}{Mahajani}{LR}{}
+\TrackLangScriptMap{Mand}{140}{Mandaic, Mandaean}{RL}{}
+\TrackLangScriptMap{Mani}{139}{Manichaean}{RL}{}
+\TrackLangScriptMap{Marc}{332}{Marchen}{LR}{}
+\TrackLangScriptMap{Maya}{090}{Mayan hieroglyphs}{varies}{}
+\TrackLangScriptMap{Mend}{438}{Mende Kikakui}{RL}{}
+\TrackLangScriptMap{Merc}{101}{Meroitic Cursive}{RL}{}
+\TrackLangScriptMap{Mero}{100}{Meroitic Hieroglyphs}{RL}{}
+\TrackLangScriptMap{Mlym}{347}{Malayalam}{LR}{}
+\TrackLangScriptMap{Modi}{324}{Modi}{LR}{}
+\TrackLangScriptMap{Mong}{145}{Mongolian}{TB}{}
+\TrackLangScriptMap{Moon}{218}{Moon (Moon code, Moon script, Moon{}
+type)}{varies}{}
+\TrackLangScriptMap{Mroo}{199}{Mro, Mru}{LR}{}
+\TrackLangScriptMap{Mtei}{337}{Meitei Mayek (Meithei, Meetei)}{LR}{}
+\TrackLangScriptMap{Mult}{323}{Multani}{LR}{}
+\TrackLangScriptMap{Mymr}{350}{Myanmar (Burmese)}{LR}{}
+\TrackLangScriptMap{Narb}{106}{Old North Arabian (Ancient North{}
+Arabian)}{RL}{}
+\TrackLangScriptMap{Nbat}{159}{Nabataean}{RL}{}
+\TrackLangScriptMap{Newa}{333}{Newa, Newar, Newari}{LR}{}
+\TrackLangScriptMap{Nkgb}{420}{Nakhi Geba}{LR}{}
+\TrackLangScriptMap{Nkoo}{165}{N'Ko}{RL}{}
+\TrackLangScriptMap{Nshu}{499}{Nushu}{LR}{}
+\TrackLangScriptMap{Ogam}{212}{Ogham}{varies}{}
+\TrackLangScriptMap{Olck}{261}{Ol Chiki}{LR}{}
+\TrackLangScriptMap{Orkh}{175}{Old Turkic, Orkhon Runic}{RL}{}
+\TrackLangScriptMap{Orya}{327}{Oriya}{LR}{}
+\TrackLangScriptMap{Osge}{219}{Osage}{LR}{}
+\TrackLangScriptMap{Osma}{260}{Osmanya}{LR}{}
+\TrackLangScriptMap{Palm}{126}{Palmyrene}{RL}{}
+\TrackLangScriptMap{Pauc}{263}{Pau Cin Hau}{LR}{}
+\TrackLangScriptMap{Perm}{227}{Old Permic}{LR}{}
+\TrackLangScriptMap{Phag}{331}{Phags-pa}{TB}{}
+\TrackLangScriptMap{Phli}{131}{Inscriptional Pahlavi}{RL}{}
+\TrackLangScriptMap{Phlp}{132}{Psalter Pahlavi}{RL}{}
+\TrackLangScriptMap{Phlv}{133}{Book Pahlavi}{RL}{}
+\TrackLangScriptMap{Phnx}{115}{Phoenician}{RL}{}
+\TrackLangScriptMap{Piqd}{293}{Klingon (KLI plqaD)}{LR}{}
+\TrackLangScriptMap{Plrd}{282}{Miao (Pollard)}{LR}{}
+\TrackLangScriptMap{Prti}{130}{Inscriptional Parthian}{RL}{}
+\TrackLangScriptMap{Qaaa}{900}{Reserved for private use{}
+(start)}{varies}{}
+\TrackLangScriptMap{Qaai}{908}{Private use}{varies}{}
+\TrackLangScriptMap{Qabx}{949}{Reserved for private use{}
+(end)}{varies}{}
+\TrackLangScriptMap{Rjng}{363}{Rejang (Redjang, Kaganga)}{LR}{}
+\TrackLangScriptMap{Roro}{620}{Rongorongo}{varies}{}
+\TrackLangScriptMap{Runr}{211}{Runic}{LR}{}
+\TrackLangScriptMap{Samr}{123}{Samaritan}{RL}{}
+\TrackLangScriptMap{Sara}{292}{Sarati}{varies}{}
+\TrackLangScriptMap{Sarb}{105}{Old South Arabian}{RL}{}
+\TrackLangScriptMap{Saur}{344}{Saurashtra}{LR}{}
+\TrackLangScriptMap{Sgnw}{095}{SignWriting}{TB}{}
+\TrackLangScriptMap{Shaw}{281}{Shavian (Shaw)}{LR}{}
+\TrackLangScriptMap{Shrd}{319}{Sharada}{LR}{}
+\TrackLangScriptMap{Sidd}{302}{Siddham}{LR}{}
+\TrackLangScriptMap{Sind}{318}{Khudawadi, Sindhi}{LR}{}
+\TrackLangScriptMap{Sinh}{348}{Sinhala}{LR}{}
+\TrackLangScriptMap{Sora}{398}{Sora Sompeng}{LR}{}
+\TrackLangScriptMap{Sund}{362}{Sundanese}{LR}{}
+\TrackLangScriptMap{Sylo}{316}{Syloti Nagri}{LR}{}
+\TrackLangScriptMap{Syrc}{135}{Syriac}{RL}{}
+\TrackLangScriptMap{Syre}{138}{Syriac (Estrangelo variant)}{RL}{}
+\TrackLangScriptMap{Syrj}{137}{Syriac (Western variant)}{RL}{}
+\TrackLangScriptMap{Syrn}{136}{Syriac (Eastern variant)}{RL}{}
+\TrackLangScriptMap{Tagb}{373}{Tagbanwa}{LR}{}
+\TrackLangScriptMap{Takr}{321}{Takri}{LR}{}
+\TrackLangScriptMap{Tale}{353}{Tai Le}{LR}{}
+\TrackLangScriptMap{Talu}{354}{New Tai Lue}{LR}{}
+\TrackLangScriptMap{Taml}{346}{Tamil}{LR}{}
+\TrackLangScriptMap{Taml}{346}{Tamil}{LR}{}
+\TrackLangScriptMap{Tang}{520}{Tangut}{LR}{}
+\TrackLangScriptMap{Tavt}{359}{Tai Viet}{LR}{}
+\TrackLangScriptMap{Telu}{340}{Telugu}{LR}{}
+\TrackLangScriptMap{Teng}{290}{Tengwar}{LR}{}
+\TrackLangScriptMap{Tfng}{120}{Tifinagh (Berber)}{LR}{}
+\TrackLangScriptMap{Tglg}{370}{Tagalog (Baybayin, Alibata)}{LR}{}
+\TrackLangScriptMap{Thaa}{170}{Thaana}{RL}{}
+\TrackLangScriptMap{Thai}{352}{Thai}{LR}{}
+\TrackLangScriptMap{Tibt}{330}{Tibetan}{LR}{}
+\TrackLangScriptMap{Tirh}{326}{Tirhuta}{LR}{}
+\TrackLangScriptMap{Ugar}{040}{Ugaritic}{LR}{}
+\TrackLangScriptMap{Vaii}{470}{Vai}{LR}{}
+\TrackLangScriptMap{Visp}{280}{Visible Speech}{LR}{}
+\TrackLangScriptMap{Wara}{262}{Warang Citi (Varang Kshiti)}{LR}{}
+\TrackLangScriptMap{Wole}{480}{Woleai}{RL}{}
+\TrackLangScriptMap{Xpeo}{030}{Old Persian}{LR}{}
+\TrackLangScriptMap{Xsux}{020}{Cuneiform, Sumero-Akkadian}{LR}{}
+\TrackLangScriptMap{Yiii}{460}{Yi}{LR}{}
+\TrackLangScriptMap{Zinh}{994}{Inherited script}{inherited}{}
+\TrackLangScriptMap{Zmth}{995}{Mathematical notation}{LR}{}
+\TrackLangScriptMap{Zsym}{996}{Symbols}{varies}{}
+\TrackLangScriptMap{Zsye}{993}{Symbols (emoji variant)}{varies}{}
+\TrackLangScriptMap{Zxxx}{997}{Unwritten documents}{varies}{}
+\TrackLangScriptMap{Zyyy}{998}{Undetermined script}{varies}{}
+\TrackLangScriptMap{Zzzz}{999}{Uncoded script}{varies}{}
+%    \end{macrocode}
+%
+%Restore category code of \texttt{@}.
+%    \begin{macrocode}
+\@tracklang@scripts@restore@at
+%    \end{macrocode}
+
+%\iffalse
+%    \begin{macrocode}
+%</tracklang-scripts.tex>
+%    \end{macrocode}
+%\fi
+%\Finale
+\endinput
-- 
cgit v1.2.3

