metrix (13aug13)

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+% \iffalse meta-comment
+%
+%% File: metrix.dtx Copyright (C) 2013 Tobias Weh
+%%
+%% It may be distributed and/or modified under the conditions of the
+%% LaTeX Project Public License (LPPL), either version 1.3c of this
+%% license or (at your option) any later version.  The latest version
+%% of this license is in the file
+%%
+%%    http://www.latex-project.org/lppl.txt
+%%
+%<*driver|package>
+% The version of expl3 required is tested as early as possible, as
+% some really old versions do not define \ProvidesExplPackage.
+\RequirePackage{expl3}[2013/07/12]
+%<package>\@ifpackagelater{expl3}{2013/03/14}
+%<package>  {}
+%<package>  {%
+%<package>    \PackageError{metrix}{Support package l3kernel too old}
+%<package>      {%
+%<package>        Please install an up to date version of l3kernel\MessageBreak
+%<package>        using your TeX package manager or from CTAN.\MessageBreak
+%<package>        \MessageBreak
+%<package>        Loading xparse will abort!%
+%<package>      }%
+%<package>    \endinput
+%<package>  }
+\def\metrixFileName{metrix}
+\def\metrixFileDescription{Typset prosody/metric symbols.}
+\def\metrixFileDate{2013/08/12}
+\def\metrixFileVersion{1.0}
+%</driver|package>
+%<*driver>
+\documentclass[full,english]{l3doc}
+
+\usepackage[latin1]{inputenc}
+\usepackage[T1]{fontenc}
+
+\usepackage{babel}
+
+\usepackage{xspace}
+\usepackage{xparse}
+\usepackage{xcolor}
+ \definecolor{twred}{HTML}{91031F}
+
+\usepackage{metrix}
+
+\usepackage{tabu,booktabs}
+\renewcommand{\arraystretch}{1.3}
+\usepackage[bottom]{footmisc}
+
+\usepackage{mdframed}
+	\newmdenv[
+		backgroundcolor=black!15,
+		linecolor=twred,
+		linewidth=1.25pt,
+		topline=false,
+		rightline=false,
+		bottomline=false,
+		frametitlefont=\sffamily\bfseries,
+		frametitle=Example,
+	]{example}
+
+\usepackage{microtype}
+\usepackage{tgpagella}
+\usepackage[scale=0.875]{tgheros}
+\usepackage{ascii}
+
+\AtBeginDocument{
+	\DeleteShortVerb{\|}
+	\DeleteShortVerb{\"}
+	\MakeShortVerb{\+}
+}
+
+\IndexPrologue{
+	\section*{Index}
+	\addcontentsline{toc}{section}{Index}
+	The italic numbers denote the pages where the 
+	corresponding entry is described, 
+	numbers underlined point to the definition, 
+	all others indicate the places where it is used.
+}
+\GlossaryPrologue{
+	\section*{Change History}
+	\addcontentsline{toc}{section}{Change~History}
+	\markboth{{Change History}}{{Change History}}
+	{\GlossaryParms\ttfamily\hyphenchar\font=`\-}
+}
+\AtBeginDocument{\renewcommand*{\glossaryname}{Change History}}
+
+\newcommand{\metrix}{\textcolor{twred}{\textbf{\textsf{m\u{e}trix}}}\xspace}
+\newcommand{\TikZ}{Ti\emph{k}Z\xspace}
+\newcommand{\Star}{\meta{\textup{\texttt{*}}}}
+\newcommand{\mail}[1]{\href{mailto:#1}{#1}}
+
+
+\begin{document}
+  \DocInput{\metrixFileName.dtx}
+\end{document}
+%</driver>
+% \fi
+%
+%
+% \title{The \metrix package}
+%
+% \author{Tobias Weh\thanks{URL: \url{http://www.tweh.de}, Mail: \mail{mail@tweh.de}}}
+%
+% \date{Version \metrixFileVersion\ -- Released \metrixFileDate}
+%
+% \maketitle
+%
+% \begin{documentation}\MakePrivateLetters
+%
+% \begin{abstract}
+% \mbox{}\par
+% \begin{center}
+% \Large
+% \metrics{_  _    _    _  _   | _    u  u  _   u   u _  }
+%         {\acct{e}t qu\acct{o}d temp-t\acct{a}-bam | scr\acct{i}-be-re v\acct{e}r-sus \acct{e}-rat}
+% \end{center}
+% \par\bigskip
+% The \metrix package can be used to print the prosodics/metrics of (latin) verses.
+% It provides macros to typeset the symbols stand alone and in combination with syllables
+% (including automatic alignment like seen above). Furthermore it defines a new br\brv{e}vis
+% and a l\lng{o}nga accent^^A
+%     \footnote{I know that these signs are no accents in the liguistic sense, but
+%     they are in the \TeX\ tradition \dots}
+% and \bow{a b}ow to contract syllables.
+%
+% \medskip
+% \emph{Thanks to David Carlisle, Marco Daniel, Enrico Gregorio, Bruno Le Floch and
+%  Joseph Wright who helped me with starting in \LaTeX3 programming. The verse above
+%  is by Ovid in his Tristia~4,10,26.}
+% \end{abstract}
+%
+% \section{Prerequisites}
+% \metrix relies only on a few packages: \pkg{tikz} (including the +calc+ library), \pkg{xpatch}
+% and \pkg{xparse}, which stand for the whole \LaTeX3 bundle.
+%
+% \section{Package loading}
+% Load \metrix as usual with +\usepackage{metrix}+. At the moment it has no options.
+%
+% \section{Bugs and feedback}
+% \subsection{Known issues}
+% \begin{itemize}
+%    \item At the moment the escaping of hyphen chars is not that good (see section~\ref{faq:hyphen}).
+%    \item Unfortunatly you can't use the active quotes of \pkg{csquotes} inside of
+%       \cs{metrics} syllable list (see section~\ref{faq:quotes}).
+% \end{itemize}
+% I'm sure there are more bugs and issues let me know if you find them \dots
+% \subsection{Feedback}
+% Any feedback on \metrix is appreciated. You may use its GitHub repository at
+% \url{https://github.com/tweh/metrix} to request features or report bugs or
+% send me an e-mail (\mail{mail@tweh.de}).
+%
+%
+% \section{Metric symbols}
+% \subsection{Stand alone metric symbols}
+% \begin{function}[EXP]{\metricsymbols}
+%   \begin{syntax}
+%     \cs{metricsymbols}\Star\oarg{highlighting}\Arg{symbols}
+%   \end{syntax}
+%   This macro typesets stand alone versions of the symbols, i.e. without
+%   syllables below (or above) of them. Use the starred version for smaller (in line) symbols
+%   and the normal version for bigger symbols. \meta{symbols} must be a list of
+%   abbreviations as listed in table~\ref{tab:symbols};\footnotemark
+%   the single abbreviations must be
+%   separated by one (or more spaces).
+% \end{function}
+%      \footnotetext{The break symbols cannot be used above syllables, they must be used together with
+%      break symbols in the syllable list, only!}
+% \begin{example}
+% The \emph{diphilius} can be shown with this code.
+%   \begin{verbatim}
+% \metricsymbols{_ _uu _ _uu u_ | x _ u u _ x u_}
+%   \end{verbatim}
+%   \metricsymbols{_ _uu _ _uu u_ | x _ u u _ x u_}
+% \end{example}
+% \subsection{Metric symbols above (or below) syllables}
+% \begin{function}[EXP]{\metrics}
+%   \begin{syntax}
+%      \cs{metrics}\oarg{highlighting}\Arg{symbols}\Arg{syllables}
+%   \end{syntax}
+%   This command can be used to align the symbols above (or below)
+%   syllables. The first \meta{symbols} argument works as before. 
+%   The second argument \meta{syllables} takes the hyphenated verse.
+% \end{function}
+% \begin{example}
+%   \begin{verbatim}
+% \metrics{_    u  u  _   _  _  | _    _  u  u   _  _   _   }
+%         {flos ve-te-ris vi-ni | meis na-ri-bus ob-iec-tust}
+%   \end{verbatim}
+%   \metrics{_    u  u  _   _  _  | _    _  u  u   _  _   _   }
+%           {flos ve-te-ris vi-ni | meis na-ri-bus ob-iec-tust}
+% \end{example}
+%
+%   \medskip\noindent
+%   You may use multiple spaces to align the abbreviations above the syllables but this is not mandatory and
+%   does not affect the output. But mind that the number of syllables equals the number of symbols. If you
+%   use the \metricsymbols*{oo} symbol you may omit the hyphen between the two syllables beloning to this
+%   symbol. You can merge multiple words by \emph{embracing} them.
+% \begin{example}
+%   \begin{verbatim}
+% \metrics{_   u  u    _       _   _  _   _  }
+%         {mol-ta quo-{que et} bel-lo pas-sus}
+%   \end{verbatim}
+%   \metrics{_   u  u    _       _   _  _   _  }
+%           {mol-ta quo-{que et} bel-lo pas-sus}
+% \end{example}
+%
+%   The macros \cs{metrics} and \cs{metricsymbols} can also be used to typeset
+%   single symbols or symbol syllable combinations.
+% \begin{example}
+%   \begin{verbatim}
+% The \metricsymbols*{_uu} shows an \emph{elementum biceps}.
+%   \end{verbatim}
+%   The \metricsymbols*{_uu} shows an \emph{elementum biceps}.
+% \end{example}
+% \begin{table}[hbtp]
+%    \centering
+%    \begin{tabu} {l>{\itshape}lcl}
+%       \toprule
+%       \rowfont{\bfseries\sffamily} \multicolumn{2}{l}{abbreviation} & symbol & explantion \\
+%       \midrule
+%       +e+ && \metricsymbols{e} & empty symbol \\
+%       +u+ && \metricsymbols{u} & elementum breve \\
+%       +_+ & (under score) & \metricsymbols{_} & elementum longum \\
+%       +uu+ && \metricsymbols{uu} & double breve \\
+%       +uu_+ && \metricsymbols{uu_} & elementum biceps \\
+%       +_uu+ && \metricsymbols{_uu} & elementum biceps \\
+%       +u_uu+ && \metricsymbols{u_uu} & elementum anceps \\
+%       +x+ && \metricsymbols{x} & elementum anceps \\
+%       +n+ && \metricsymbols{n} & elementum indifferens \\
+%       +u_+ && \metricsymbols{u_} & elementum indifferens \\
+%       +oo+ & (two lowercase o's) & \metricsymbols{oo} & aeolic base \\
+%       +|+ & (pipe) & \metricsymbols{|} & break \\
+%       +||+ & (two pipes) & \metricsymbols{||} & verse break \\
+%       \bottomrule
+%    \end{tabu}
+%    \caption{Symbol abbreviations}\label{tab:symbols}
+%   \end{table}
+% \subsection{Highlight certain symbols/syllabels}
+% As you can see above \cs{metrics} and \cs{metricsymbols} got an optional argument taking
+% some options to highlight a certain symbol/syllable. The \meta{highlighting} list must
+% contain one or more comma separated pairs of \meta{numbers}+=+\meta{style}, where \meta{numbers}
+% is the number of a symbol/syllable (e.g. +3+) or a list of numbers separated by plus signs
+% (e.g. \verb.2+3+5.) in the list and \meta{style} is any \TikZ style (other \TikZ options may not 
+% work properly, so you maybe must create your own style, see section~\ref{faq:highlight}.)
+%
+% \medskip\noindent
+% \metrix comes with several predefined highlighting styles:
+% \DeleteShortVerb{\+}
+% \begin{itemize}
+%    \item \textbf{\texttt{bold highlight}}\\[2ex]
+%       \metrics[2+5+9+13={bold highlight}]{_    u  u  _   _  _  | _    _  u  u   _  ||}
+%        {flos ve-te-ris vi-ni | meis na-ri-bus ob ||}\hfill
+%       \metricsymbols[2+3+5+7={bold highlight}]{u u_uu x _ | u _ n ||}
+%
+%    \item \textbf{\texttt{colored highlight=}\meta{color}}\\[2ex]
+%       \metrics[2+5+9+13={colored highlight}]{_    u  u  _   _  _  | _    _  u  u   _  ||}
+%        {flos ve-te-ris vi-ni | meis na-ri-bus ob ||}\hfill
+%       \metricsymbols[2+3+5+7={colored highlight}]{u u_uu x _ | u _ n ||}
+%       
+%       This style has an \emph{optional} argument to change the highlighting color on the fly.
+%       To change the color in general change the value of the variable \verb.highlightcolor..
+%
+%    \item \textbf{\texttt{dashed highlight}}\\[2ex]
+%       \metrics[2+5+9+13={dashed highlight}]{_    u  u  _   _  _  | _    _  u  u   _  ||}
+%        {flos ve-te-ris vi-ni | meis na-ri-bus ob ||}\hfill
+%       \metricsymbols[2+3+5+7={dashed highlight}]{u u_uu x _ | u _ n ||}
+%
+%    \item \textbf{\texttt{filled highlight=}\meta{color}}\\[2ex]
+%       \metrics[2+5+9+13={filled highlight}]{_    u  u  _   _  _  | _    _  u  u   _  ||}
+%        {flos ve-te-ris vi-ni | meis na-ri-bus ob ||}\hfill
+%       \metricsymbols[2+3+5+7={filled highlight}]{u u_uu x _ | u _ n ||}
+%
+%       This style has an \emph{optional} argument to change the filling color on the fly.
+%       To change the color in general change the value of the variable \verb.fillcolor..
+%
+%    \item \textbf{\texttt{superscript=}\meta{text}}\\[2ex]
+%       \metrics[7={superscript=a},13={superscript=b}]{_    u  u  _   _  _  | _    _  u  u   _  ||}
+%       {flos ve-te-ris vi-ni | meis na-ri-bus ob ||}\hfill
+%       \metricsymbols[5={superscript=a},9={superscript=b}]{u u_uu x _ | u _ n ||}
+%
+%       This style takes a \emph{mandatory} argument to add a superscript letter or a
+%       number to a symbol. It is designed to work with the break symbols, but works with others too.
+% \end{itemize}
+% \MakeShortVerb{\+}
+%
+% \medskip\noindent
+% \textbf{Sytles with an agrument must be set in braces} (see the examples)\textbf{!}
+% \begin{example}
+% Higlight some syllables with color.
+% \begin{verbatim}
+% \metrics
+%    [
+%       2=colored highlight,
+%       4={colored highlight=orange},
+%       5={colored highlight=blue},
+%       7=colored highlight,
+%       11=colored highlight
+%   ]
+%   {_    u  u  _   _  _  | _    _  u  u   _ }
+%   {flos ve-te-ris vi-ni | meis na-ri-bus ob}
+% \end{verbatim}
+% \metrics
+%    [
+%       2=colored highlight,
+%       4={colored highlight=orange},
+%       5={colored highlight=blue},
+%       7=colored highlight,
+%       11=colored highlight
+%   ]
+%   {_    u  u  _   _  _  | _    _  u  u   _ }
+%   {flos ve-te-ris vi-ni | meis na-ri-bus ob}
+% \end{example}
+% \begin{example}
+% The shorter version using the \verb.+. syntax.
+% \begin{verbatim}
+% \metrics[2+5+9=bold highlight]
+%   {_    u  u  _   _  _  | _    _  u  u   _ }
+%   {flos ve-te-ris vi-ni | meis na-ri-bus ob}
+% \end{verbatim}
+% \DeleteShortVerb{\+}
+% \metrics[2+5+9=bold highlight]
+%   {_    u  u  _   _  _  | _    _  u  u   _ }
+%   {flos ve-te-ris vi-ni | meis na-ri-bus ob}
+% \end{example}
+% \begin{example}
+% Mixing and combining styles is possible too.
+% \begin{verbatim}
+% \metricsymbols[1+4=bold highlight, 3=colored highlight]
+%   {u_uu x _ || u _ n ||} \\
+% \metricsymbols[2={bold highlight,colored highlight}]
+%   {u_uu x _ || u _ n ||}
+% \end{verbatim}
+% \DeleteShortVerb{\+}
+% \metricsymbols[1+4=bold highlight, 3=colored highlight]
+%   {u_uu x _ || u _ n ||}\\
+% \metricsymbols[2={bold highlight,colored highlight}]
+%   {u_uu x _ || u _ n ||}
+% \MakeShortVerb{\+}
+% \end{example}
+% \begin{example}
+% Add some superscripts to the breaks.
+% \begin{verbatim}
+% \metricsymbols[6={superscript=5},10={colored highlight,superscript=bD}]
+%    {_ _uu _ _uu _ | _uu _ _uu || _ uu _ u_}
+% \end{verbatim}
+% \metricsymbols[6={superscript=5},10={bold highlight,superscript=bD}]
+%    {_ _uu _ _uu _ | _uu _ _uu || _ uu _ u_}
+% \end{example}
+%
+% \section{Accents and bows}
+% \begin{function}[EXP]{\brv,\lng,\acct}
+%    \begin{syntax}
+%       \cs{brv}\Arg{vowel}\qquad\cs{lng}\Arg{vowel}\qquad\cs{acct}\Arg{vowel}
+%    \end{syntax}
+%    The first commands offer an alternative to the standard accent macros +\u+ and +\=+. The difference
+%    is that \cs{brv} centers the accent above the vowel or diphthong and \cs{lng} stretches the bar across
+%    the whole vowel or diphthong. \cs{acct} adds an accent dot below a vowel or dipthtong.\footnotemark
+% \end{function}
+% \footnotetext{Actually you can use any vowel, diphtong, syllable or word as \meta{vowel},
+% it makes no difference as long as it is text.}
+% \begin{example}
+% Add accents to all vowels.
+% \begin{verbatim}
+% \brv{a}m\acct{\lng{i}}c\brv{u}s pr\acct{\brv{o}}f\brv{u}g\brv{u}s
+% \end{verbatim}
+% \brv{a}m\acct{\lng{i}}c\brv{u}s pr\acct{\brv{o}}f\brv{u}g\brv{u}s
+% \end{example}
+%
+% \metrix also tries to do some kind of italic correction, and shifts the accents a little to the
+% right when an italic or slanted font is used.
+% \par\large\medskip
+% \brv{u}\enskip\textit{\brv{u}}\enskip\textsl{\brv{u}}\qquad
+% \brv{i}\enskip\textit{\brv{i}}\enskip\textsl{\brv{i}}\qquad
+% \brv{ae}\enskip\textit{\brv{ae}}\enskip\textsl{\brv{ae}}\hfill
+% {\sffamily
+% \brv{u}\enskip\textit{\brv{u}}\enskip\textsl{\brv{u}}\qquad
+% \brv{i}\enskip\textit{\brv{i}}\enskip\textsl{\brv{i}}\qquad
+% \brv{ae}\enskip\textit{\brv{ae}}\enskip\textsl{\brv{ae}}\hfill\mbox{}}
+% \par\medskip
+% \lng{u}\enskip\textit{\lng{u}}\enskip\textsl{\lng{u}}\qquad
+% \lng{i}\enskip\textit{\lng{i}}\enskip\textsl{\lng{i}}\qquad
+% \lng{ae}\enskip\textit{\lng{ae}}\enskip\textsl{\lng{ae}}\hfill
+% {\sffamily
+% \lng{u}\enskip\textit{\lng{u}}\enskip\textsl{\lng{u}}\qquad
+% \lng{i}\enskip\textit{\lng{i}}\enskip\textsl{\lng{i}}\qquad
+% \lng{ae}\enskip\textit{\lng{ae}}\enskip\textsl{\lng{ae}}\hfill\mbox{}}
+% \par\medskip
+% \acct{u}\enskip\textit{\acct{u}}\enskip\textsl{\acct{u}}\qquad
+% \acct{i}\enskip\textit{\acct{i}}\enskip\textsl{\acct{i}}\qquad
+% \acct{ae}\enskip\textit{\acct{ae}}\enskip\textsl{\acct{ae}}\hfill
+% {\sffamily
+% \acct{u}\enskip\textit{\acct{u}}\enskip\textsl{\acct{u}}\qquad
+% \acct{i}\enskip\textit{\acct{i}}\enskip\textsl{\acct{i}}\qquad
+% \acct{ae}\enskip\textit{\acct{ae}}\enskip\textsl{\acct{ae}}\hfill\mbox{}}
+% \par\normalsize
+%
+% \begin{function}[EXP]{\bow}
+%    \begin{syntax}
+%       \cs{bow}\Arg{syllables}
+%    \end{syntax}
+%    \cs{bow} can be used to show the contraction of two vowels or syllables.
+% \end{function}
+% \begin{example}
+%    \begin{verbatim}
+% mult\bow{um i}lle or d\bow{ei}nde
+%    \end{verbatim}
+%    mult\bow{um i}lle or d\bow{ei}nde
+% \end{example}
+%
+% \section{Environments}
+% \begin{function}{symbolline}
+% This environment can be used to display a line of stand alone symbols.
+% \end{function}
+% \begin{example}
+% \begin{verbatim}
+% Text text text ...
+% \begin{symbolline}
+%    \metricsymbols{oo e _ u u _ e u _ e u _ u_}
+% \end{symbolline}
+% Text text text ...
+% \end{verbatim}
+% Text text text ...
+% \begin{symbolline}
+%    \metricsymbols{oo e _ u u _ e u _ e u _ u_}
+% \end{symbolline}
+% Text text text ...
+% \end{example}
+% \begin{function}{metricverses}
+% \begin{syntax}
+%    +\begin{metricverses}+\oarg{source}
+%       \meta{content optional \cs{verseref}\Arg{reference}}
+%    +\end{metricverses}+
+% \end{syntax}
+% Use this environment to display a verse with metric symbols, separate
+% multiple verses by a blank line.
+% \end{function}
+% \begin{example}
+% \begin{verbatim}
+% Text text text ...
+% \begin{metricverses}
+%    \metrics{_    u  u  _   _  _  | _    _  u  u   _  _   _   }
+%            {flos ve-te-ris vi-ni | meis na-ri-bus ob-iec-tust}
+%
+%    \metrics{_  u  u _   u  u  _   |  _             _   u  u
+%                                                        _   u  u  _   }
+%            {ei-us a-mor cu-pi-dam | {m\bow{e h}uc} pro-li-cit
+%                                                        per te-ne-bras}
+% \end{metricverses}
+% Text text text ...
+% \end{verbatim}
+% Text text text ...
+% \begin{metricverses}
+%    \metrics{_    u  u  _   _  _  | _    _  u  u   _  _   _   }
+%            {flos ve-te-ris vi-ni | meis na-ri-bus ob-iec-tust}
+%
+%    \metrics{_  u  u _   u  u  _   |  _             _   u  u
+%                                                   _   u  u  _   }
+%            {ei-us a-mor cu-pi-dam | {m\bow{e h}uc} pro-li-cit
+%                                                   per te-ne-bras}
+% \end{metricverses}
+% Text text text ...
+% \end{example}
+% \begin{function}{\verseref}
+% \begin{syntax}
+%    \cs{verseref}\Arg{reference}
+% \end{syntax}
+% Inside of +{metricverses}+ you may use \cs{verseref} to print a reference.
+% \end{function}
+% \begin{example}
+% \begin{verbatim}
+% Text text text ...
+% \begin{metricverses}
+%    \metrics{_    u  u  _   _  _  | _    _  u  u   _  _   _   }
+%            {flos ve-te-ris vi-ni | meis na-ri-bus ob-iec-tust}
+%    \verseref{Plaut. \emph{Curc.} 96f}
+%
+%    \metrics{_  u  u _   u  u  _   |  _             _   u  u
+%                                                        _   u  u  _   }
+%            {ei-us a-mor cu-pi-dam | {m\bow{e h}uc} pro-li-cit
+%                                                        per te-ne-bras}
+% \end{metricverses}
+% Text text text ...
+% \end{verbatim}
+% Text text text ...
+% \begin{metricverses}
+%    \metrics{_    u  u  _   _  _  | _    _  u  u   _  _   _   }
+%            {flos ve-te-ris vi-ni | meis na-ri-bus ob-iec-tust}
+%    \verseref{Plaut. \emph{Curc.} 96f}
+%
+%    \metrics{_  u  u _   u  u  _   |  _             _   u  u   _   u  u  _   }
+%            {ei-us a-mor cu-pi-dam | {m\bow{e h}uc} pro-li-cit per te-ne-bras}
+% \end{metricverses}
+% Text text text ...
+% \end{example}
+%
+% \section{FAQs}\label{sec:faq}
+% \subsection{How can I display the symbols below the syllables?}
+% Change the variable +symbolshift+ to a negative value.
+% \begin{example}
+% \begin{verbatim}
+% \setmetrixvar{symbolshift}{-0.6em}
+% % later ...
+% \metrics{_    u  u  _   _  _  | _    _  u  u   _  _   _   }
+%         {flos ve-te-ris vi-ni | meis na-ri-bus ob-iec-tust}
+% \end{verbatim}
+% \setmetrixvar{symbolshift}{-0.6em}
+% \metrics{_    u  u  _   _  _  | _    _  u  u   _  _   _   }
+%         {flos ve-te-ris vi-ni | meis na-ri-bus ob-iec-tust}
+% \end{example}
+% \subsection{How can I combine two words below one symbol?}
+% Use braces +{}+ in the lists to keep them processed as one element.
+% \begin{example}
+% \begin{verbatim}
+% \metrics{u  u  _   |  _             _   u  u   }
+%         {cu-pi-dam | {m\bow{e h}uc} pro-li-cit }
+% \end{verbatim}
+% \metrics{u  u  _   |  _             _   u  u   }
+%         {cu-pi-dam | {m\bow{e h}uc} pro-li-cit }
+% \end{example}
+% \subsection{How can I show a hyphen character?}\label{faq:hyphen}
+% To escape a hyphen +-+ put it inside braces, but you must still
+% add an unbraced hypen to show \metrix where your syllables split.
+% \begin{example}
+% If you enclose the hyphen in braces together with a syllable, the symbol gets
+% centered above both.
+% \begin{verbatim}
+% \metrics{_    _  }
+%         {vi-{-ni}}
+% \end{verbatim}
+% \metrics{_    _  }
+%         {vi-{-ni}}
+% \par\smallskip\noindent
+% You can enclose only the hyphen in braces and treat it as a syllable
+% but then you must add an empty symbol +e+ too.
+% \begin{verbatim}
+% \metrics{_   e  _ }
+%         {vi-{-}-ni}
+% \end{verbatim}
+% \metrics{_   e  _ }
+%         {vi-{-}-ni}
+% \end{example}
+% \subsection{How can I use quotes in \cs{metrics}?}\label{faq:quotes}
+% It should be possible to use all shorthands (or direct input with Unicode) etc.
+% for quotation marks except the active
+% quotes of \pkg{csquotes}, which won't work inside the \cs{metrics} syllable list. It
+% is possible to use \pkg{csquotes} besides \metrix though.
+% \begin{example}
+% \begin{verbatim}
+% \metrics{ _   u }{ ``si me'' }
+% \metrics{ _   u }{ ``si me'' }
+% \metrics{ _   u }{ \glqq si me\grqq }% with \usepackage[<lang>]{babel}
+% \metrics{ _   u }{ "`si me"' }% with \usepackage[ngerman]{babel}
+% \end{verbatim}
+% \metrics{ _   u }{ ``si me'' }\quad
+% \metrics{ _   u }{ ``si me'' }\quad
+% \metrics{ _   u }{ \glqq si me\grqq }\quad
+% \metrics{ _   u }{ \glqq si me\grqq }
+% \end{example}
+% \subsection{How can I add a superscript letter to a certain symbol?}
+% Use the |superscript| highlighting style as described above.
+% \subsection{How can I make subscripts instead of superscripts?}
+% The easiest way is to use the +superscript+ style and change a part of
+% its definition to shift the superscripts to subscript positions.
+% \begin{example}
+% \begin{verbatim}
+% \metricsymbols[2={superscript=x}]{ u || u } \qquad vs. \qquad
+% % ...
+% \tikzset{
+%    every superscript picture/.style={
+%       baseline=1ex,
+%    },
+% }
+% % ...
+% \metricsymbols[2={superscript=x}]{ u || u }
+% \end{verbatim}
+% \metricsymbols[2={superscript=x}]{ u || u } \qquad vs. \qquad
+% \tikzset{
+%    every superscript picture/.style={
+%       baseline=2ex,
+%    },
+% }
+% \metricsymbols[2={superscript=x}]{ u || u }
+% 
+% \medskip\noindent
+% Normally the +\tikzset+ should be part of your preamble, I used it this way to
+% show the differences.
+% \end{example}
+% \subsection{How can I highlight all symbols/syllables?}
+% \textbf{Way 1}\qquad Just call your desired highlighting style before using on of the macros 
+% \cs{metrics} or \cs{metricsymbols}. You may enclose this in a group to not affect the other following
+% sequences. Mind that the higlighting styles must be in a way changing the +every ...+ styles
+% to make this way work.
+% \begin{example}
+% \begin{verbatim}
+% {% begin group
+%    \tikzset{colored highlight}
+%    \metrics{_    u  u  _   _  _ }
+%            {flos ve-te-ris vi-ni}
+% }% end group
+% \end{verbatim}
+%    \tikzset{colored highlight}
+%    \metrics{_    u  u  _   _  _ }
+%            {flos ve-te-ris vi-ni}
+% \end{example}
+% \par\medskip\noindent
+% \textbf{Way 2}\qquad Change the +every metrix ...+ styles.
+% \begin{example}
+% \begin{verbatim}
+% {% begin group
+%    \tikzset{every metrix symbol/.append style={red}}
+%    \metrics{_    u  u  _   _  _ }
+%            {flos ve-te-ris vi-ni}
+% }% end group
+% \end{verbatim}
+%    \tikzset{every metrix symbol/.append style={red}}
+%    \metrics{_    u  u  _   _  _ }
+%            {flos ve-te-ris vi-ni}
+% \end{example}
+% Leave out the grouping (and put this to your preamble) if yout want to highlight
+% the symbols in your whole document.
+% \subsection{How can I change the size of a symbol?}
+% Change the two base vector units.
+% \begin{example}
+% \begin{verbatim}
+% \setmetrixvar{baseunit}{1em}
+% \setmetrixvar{bigbaseunit}{1.6em}
+% \end{verbatim}
+% \end{example}
+% If you want to change the size of a single symbol to highlight it you must
+% create your own highlighting style.
+% \begin{example}
+% \begin{verbatim}
+% \tikzset{
+%  bigger highlight/.style={
+%   every metrix symbol/.append style={x=2.5em,y=2.5em,line width=1.5pt},
+%  },
+% }
+% % later
+% \metricsymbols[2=bigger highlight]{u_uu x _ || u _ n x}
+% \end{verbatim}
+% \tikzset{
+%  bigger highlight/.style={
+%   every metrix symbol/.append style={x=2.5em,y=2.5em,line width=1.5pt},
+%  },
+% }
+% \metricsymbols[2=bigger highlight]{u_uu x _ || u _ n x}
+% \end{example}
+% \subsection{How can I stop highlighting the syllables too?}\label{faq:highlight}
+% \textbf{Way 1}\qquad Change the highlight styles (in your preamble).
+% \begin{example}
+% \begin{verbatim}
+% \tikzset{
+%    colored highlight/.style={
+%       every metrix symbol/.append style={
+%          draw=\usemetrixvar{highlightcolor},
+%       },
+%    },
+% }
+% % later ...
+% \metrics[3=colored highlight]{_    u  u  _   _  _ }
+%                              {flos ve-te-ris vi-ni}
+% \end{verbatim}
+% {\tikzset{
+%    colored highlight/.style={
+%       every metrix symbol/.append style={draw=\usemetrixvar{highlightcolor}},
+%    }
+% }
+% \metrics[3=colored highlight]{_    u  u  _   _  _ }
+%                              {flos ve-te-ris vi-ni}}
+% \end{example}
+% \par\medskip\noindent
+% \textbf{Way 2}\qquad Create your own highlighting style, which is very similar
+% to way 1, as the following example shows. Every own style should change the apperance
+% by appending the settings to one of the +every ...+ styles.
+% \begin{example}
+% \begin{verbatim}
+% \tikzset{
+%    my highlight/.style={
+%       every metrix symbol/.append style={draw=blue,line width=0.07em},
+%    }
+% }
+% \metrics[5=my highlight]{_    u  u  _   _  _ }
+%                         {flos ve-te-ris vi-ni}
+% \end{verbatim}
+% \tikzset{
+%    my highlight/.style={
+%       every metrix symbol/.append style={draw=blue,line width=0.1em},
+%    }
+% }
+% \metrics[5=my highlight]{_    u  u  _   _  _ }
+%                         {flos ve-te-ris vi-ni}
+% \end{example}
+% \subsection{Why got the highlight styles that long names?}
+% To prevent conflict with other packages.
+% \begin{example}
+% If you want to shorten it create your own style as described above or use
+% \begin{verbatim}
+% \tikzset{
+%  hl/.style={colored highlight}
+% }
+% \end{verbatim}
+% to map the style to a shorter name. Then you can use it like in
+% \begin{verbatim}
+% \metricsymbols[2=hl]{u _ _ u}
+% \end{verbatim}
+% \end{example}
+% \subsection{How can I change the font of all syllables?}
+% Extend the +every metrix syllable node+ style
+% \begin{example}
+% Print all syllables in italic with the following extension.
+% \begin{verbatim}
+% \tikzset{
+%    every metrix syllable node/.append sytle={font=\itshape},
+% }
+% \end{verbatim}
+% \end{example}
+%
+% \section{Customization}
+% Some hints were already given in the FAQ section (see section~\ref{sec:faq}) but here I will
+% list all variables and \TikZ styles that are in use and can be changed to customize
+% \metrix easily.
+% \subsection{Variables}
+% \begin{function}{\setmetrixvar,\usemetrixvar}
+% To customize the rendering of the symbols, accents and bow \metrix has some variables
+% that you can change.
+% \begin{syntax}
+%    \cs{setmetrixvar}\Arg{variable}\Arg{value}
+% \end{syntax}
+% Use \cs{setmetrixvar} to change a value. The variables and the default values are listed
+% in table~\ref{tab:variables}. To access a value you can use \cs{usemetrixvar}\Arg{variable}.
+% \end{function}
+% It is highly recommended to use font size depending units, i.e. +em+ or +ex+, for all lengthen
+% to keep the symbols usable in different font sizes, for example in headlines or footnotes.
+% \begin{example}
+% Change the highlighting color to blue.
+% \begin{verbatim}
+% \setmetrixvar{higlightcolor}{blue}
+% % later
+% \metrics[5=colored highlight]{_    u  u  _   _  _ }
+%                              {flos ve-te-ris vi-ni}
+% \end{verbatim}
+% \setmetrixvar{highlightcolor}{blue}
+% \metrics[5=colored highlight]{_    u  u  _   _  _ }
+%                              {flos ve-te-ris vi-ni}
+% \end{example}
+% \begin{example}
+% Create your own highlighting style but use the default highlighting color.
+% \begin{verbatim}
+% \tikzset{
+%    my highlight/.style={
+%       every metrix symbol/.append style={
+%          draw=\usemetrixvar{highlightcolor},
+%          line width=0.15em
+%       },
+%    },
+% }
+% \metrics[5=my highlight]{_    u  u  _   _  _ }
+%                         {flos ve-te-ris vi-ni}
+% \end{verbatim}
+% \tikzset{
+%    my highlight/.style={
+%       every metrix symbol/.append style={
+%          draw=\usemetrixvar{highlightcolor},
+%          line width=0.15em
+%       },
+%    },
+% }
+% \metrics[5=my highlight]{_    u  u  _   _  _ }
+%                         {flos ve-te-ris vi-ni}
+% \end{example}
+% \begin{table}[p]
+%    \vspace*{-3\baselineskip}
+%    \centering
+%    \begin{tabu}to \textwidth {llX}
+%       \toprule
+%       \rowfont{\bfseries\sffamily} variable & default & explanation \\
+%       \midrule
+%       +symbollinewidth+ & +0.04em+ & line width of symbols above syllables and small stand alone symbols \\
+%       +bigsymbollinewidth+ & +0.06em+ & line width of big stand alone symbols \\
+%       +accentlinewidth+ & +0.03em+ & line width of accents (\cs{lng} and \cs{brv}) \\
+%       +bowlinewidth+ & +0.03em+ & line width of bows (\cs{bow}) \\
+%       +symbolsep+ & +0.4em+ & gap between symbols in stand alone lists \\
+%       +baseunit+ & +0.9em+ & length of the base vector for drawing symbols above
+%                              syllables, small stand alone symbols, accents and bows\\
+%       +bigbaseunit+ & +1.4em+ & length of the base vector for drawing stand alone symbols \\
+%       +shortsyllablelimit+ & +0.8em+ & all syllables shorter than this can be treated specially, e.g.
+%                                        they'll get a shorter elementum longum. \\
+%       +gap+ & +0.09em+ & small gap between lines of the symbols, e.g. the distance between the
+%                          two lines of a verse break \\
+%       +symbolshift+ & +1.1em+ & leght to shift the symbols above or below the syllables
+%                           (try +-0.6em+ to display the symbols below the base line) \\
+%       +lngshift+ & +0.8em+ & length to shift the longa accent \\
+%       +lngshortening+ & +0.075em+ & length to shorten the longa accent a little \\
+%       +lngminlength+ & +0.25em+ & minimum width of a longa accent \\
+%       +brvshift+ & +0.9em+ & length to shift the brevis accent \\
+%       +dotshift+ & +-0.15em+ & length to shift the dot accent \\
+%       +itcorrection+ & +0.11em+ & length to shift the accents above italic/slanted letters \\
+%       +accentxshift+ & +-0.025em+ & length to shift the accents horizontally \\
+%       +bowshift+ & +-0.15em+ & length to shift the bow below the base line \\
+%       +bowshortening+ & +0.15em+ & length to shrink the bow a little \\
+%       +bowlooseness+ & +0.75+ & value to influence the bending of the bow \\
+%       +symbolcolor+ & +black+ & color of metric symbols \\
+%       +accentcolor+ & +black+ & color of accents (\cs{lng} and \cs{brv}) \\
+%       +bowcolor+ & +black+ & color of bows (\cs{bow}) \\
+%       +highlightcolor+ & +red+ & color of highlighted symbols and syllabels
+%                                 used in +colored highlight+ style \\
+%       +fillcolor+ & +yellow+ & color of filled symbol +node+s
+%                                 used in +filled highlight+ style \\
+%       +breakgap+ & +0.6em+ & gap before and after a (verse) break \\
+%       +emptywidth+ & +1em+ & gap replacing an empty symbol (abbreviation +e+) \\
+%       \bottomrule
+%    \end{tabu}
+%    \caption{Variables}\label{tab:variables}
+% \end{table}
+%
+% \subsection{\TikZ styles}\label{sec:styles}
+% Beside the variables you may change the \TikZ styles used by \metrix. But please mind
+% that all styles are not empty by default so you should prefer +/.append style+ against
+% +/.style+. Otherwise it may cause strange effects. Remind that you can use \cs{usemetrixvar}
+% to access a variable.
+% \begin{variable}{every~metrix~symbol, every~metrix~big~symbol, every~metrix~symbol~node}
+% These three styles define the apperance of the metric symbols. They define the line width,
+% the color, the basis vectors and other things.
+% \end{variable}
+% \begin{variable}{every~metrix~syllable~node,every~metrix~break~node}
+% These styles defines the +node+s in which a syllable or a break symbol (the ones spanning across
+% the symbol and the syllable line) is typeset, e.g. it aligns these +node+s at their base line.
+% \end{variable}
+% \begin{variable}{every~metrix~accent}
+% This style defines the apperance of accents created by \cs{lng} and \cs{brv}.
+% \end{variable}
+% \begin{variable}{every~metrix~bow}
+% This style defines the apperance of bows below symbols.
+% \end{variable}
+% \begin{variable}{bold~highlight,colored~highlight,dashed~highlight,filled~highlight,superscript}
+% These styles can be used to highlight a certain symbol.
+% \end{variable}
+% \begin{variable}{every~superscript~picture,every~superscript~node,every~superscript~label}
+% These styles are used to define the +superscript+ highlighting style.
+% \end{variable}
+%
+% \end{documentation}
+%
+% \begin{implementation}
+%
+% \section{Implementation}
+%
+%    \begin{macrocode}
+%<*package>
+%    \end{macrocode}
+%
+%    \begin{macrocode}
+%<@@=metrix>
+%    \end{macrocode}
+%
+%    \begin{macrocode}
+\ProvidesExplPackage
+  {\metrixFileName}{\metrixFileDate}{\metrixFileVersion}{\metrixFileDescription}
+%    \end{macrocode}
+%
+% \subsection{Required packages}
+%    \begin{macrocode}
+\RequirePackage{xparse}
+\RequirePackage{xpatch}
+\RequirePackage{tikz}
+\ExplSyntaxOff
+ \usetikzlibrary{calc}
+\ExplSyntaxOn
+%    \end{macrocode}
+%
+% \subsection{Variables}
+% All variables are internal. The user can change them via \cs{setmetrixvar} and use them
+% via \cs{usemetrixvar}.
+% \begin{variable}[internal]{\g_@@_variable_symbollinewidth_tl}
+%    This variable stores the line width for all metric symbols above (or below) syllables.
+%    \begin{macrocode}
+\tl_new:N \g_@@_variable_symbollinewidth_tl
+\tl_set:Nn \g_@@_variable_symbollinewidth_tl { 0.04em }
+%    \end{macrocode}
+% \end{variable}
+% \begin{variable}[internal]{\g_@@_variable_bigsymbollinewidth_tl}
+%    This variable stores the line width for all stand alone metric symbols.
+%    \begin{macrocode}
+\tl_new:N \g_@@_variable_bigsymbollinewidth_tl
+\tl_set:Nn \g_@@_variable_bigsymbollinewidth_tl { 0.06em }
+%    \end{macrocode}
+% \end{variable}
+% \begin{variable}[internal]{\g_@@_variable_accentlinewidth_tl}
+%    This variable stores the line width of the accent like symbols.
+%    \begin{macrocode}
+\tl_new:N \g_@@_variable_accentlinewidth_tl
+\tl_set:Nn \g_@@_variable_accentlinewidth_tl { 0.04em }
+%    \end{macrocode}
+% \end{variable}
+% \begin{variable}[internal]{\g_@@_variable_bowlinewidth_tl}
+%    This variable stores the line width of the bow.
+%    \begin{macrocode}
+\tl_new:N \g_@@_variable_bowlinewidth_tl
+\tl_set:Nn \g_@@_variable_bowlinewidth_tl { 0.04em }
+%    \end{macrocode}
+% \end{variable}
+% \begin{variable}[internal]{\g_@@_variable_symbolsep_tl}
+%    This variable stores the gap between two or more stand alone metric symbols.
+%    \begin{macrocode}
+\tl_new:N \g_@@_variable_symbolsep_tl
+\tl_set:Nn \g_@@_variable_symbolsep_tl { 0.4em }
+%    \end{macrocode}
+% \end{variable}
+% \begin{variable}[internal]{\g_@@_variable_baseunit_tl}
+%    This variable stores the length of the basis vector for all metric symbols above (or below)
+%     syllables and accent like symbols.
+%    \begin{macrocode}
+\tl_new:N \g_@@_variable_baseunit_tl
+\tl_set:Nn \g_@@_variable_baseunit_tl { 0.9em }
+%    \end{macrocode}
+% \end{variable}
+% \begin{variable}[internal]{\g_@@_variable_bigbaseunit_tl}
+%    This variable stores the length of the basis vector for all stand alone metric symbols.
+%    \begin{macrocode}
+\tl_new:N \g_@@_variable_bigbaseunit_tl
+\tl_set:Nn \g_@@_variable_bigbaseunit_tl { 1.4em }
+%    \end{macrocode}
+% \end{variable}
+% \begin{variable}[internal]{\g_@@_variable_gap_tl}
+%    Length for small gaps in the symbols, e.g. the gap between the two bows of an elementum biceps.
+%    \begin{macrocode}
+\tl_new:N \g_@@_variable_gap_tl
+\tl_set:Nn \g_@@_variable_gap_tl { 0.09em }
+%    \end{macrocode}
+% \end{variable}
+% \begin{variable}[internal]{\g_@@_variable_symbolshift_tl}
+%    This variable stores the value to shift metric symbols above (or below) syllables.
+%    Set this variable to approx +1.1em+ to draw the symbols above the syllable and to +-0.6em+
+%    to draw them below.
+%    \begin{macrocode}
+\tl_new:N \g_@@_variable_symbolshift_tl
+\tl_set:Nn \g_@@_variable_symbolshift_tl { 1.1em }
+%    \end{macrocode}
+% \end{variable}
+% \begin{variable}[internal]{\g_@@_variable_lngshift_tl}
+%    This variable stores the value to shift the longa accent.
+%    \begin{macrocode}
+\tl_new:N \g_@@_variable_lngshift_tl
+\tl_set:Nn \g_@@_variable_lngshift_tl { 0.15em }
+%    \end{macrocode}
+% \end{variable}
+% \begin{variable}[internal]{\g_@@_variable_lngshortening_tl}
+%    This variable stores the value to shorten the longa accent.
+%    \begin{macrocode}
+\tl_new:N \g_@@_variable_lngshortening_tl
+\tl_set:Nn \g_@@_variable_lngshortening_tl { 0.075em }
+%    \end{macrocode}
+% \end{variable}
+% \begin{variable}[internal]{\g_@@_variable_lngminlength_tl}
+%    This variable stores the value to shorten the longa accent.
+%    \begin{macrocode}
+\tl_new:N \g_@@_variable_lngminlength_tl
+\tl_set:Nn \g_@@_variable_lngminlength_tl { 0.25em }
+%    \end{macrocode}
+% \end{variable}
+% \begin{variable}[internal]{\g_@@_variable_brvshift_tl}
+%    This variable stores the value to shift the brevis accent.
+%    \begin{macrocode}
+\tl_new:N \g_@@_variable_brvshift_tl
+\tl_set:Nn \g_@@_variable_brvshift_tl { 0.25em }
+%    \end{macrocode}
+% \end{variable}
+% \begin{variable}[internal]{\g_@@_variable_dotshift_tl}
+%    This variable stores the value to shift the brevis accent.
+%    \begin{macrocode}
+\tl_new:N \g_@@_variable_dotshift_tl
+\tl_set:Nn \g_@@_variable_dotshift_tl { -0.15em }
+%    \end{macrocode}
+% \end{variable}
+% \begin{variable}[internal]{
+%  \g_@@_variable_itcorrection_tl,
+%  \l_@@_internal_itcorrection_tl,
+%  \g_@@_internal_itcorrection_zero_tl}
+% These variables are used to set the italic correction of accents.
+%    \begin{macrocode}
+\tl_new:N \g_@@_variable_itcorrection_tl
+\tl_set:Nn \g_@@_variable_itcorrection_tl { 0.11em }
+\tl_new:N \l_@@_internal_itcorrection_tl
+\tl_set:Nn \l_@@_internal_itcorrection_tl { 0em }
+\tl_new:N \g_@@_internal_itcorrection_zero_tl
+\tl_set:Nn \g_@@_internal_itcorrection_zero_tl { 0em }
+%    \end{macrocode}
+% \end{variable}
+% \begin{variable}[internal]{\g_@@_variable_accentxshift_tl}
+%    This variable ise used to shift the accents horizontally.
+%    \begin{macrocode}
+\tl_new:N \g_@@_variable_accentxshift_tl
+\tl_set:Nn \g_@@_variable_accentxshift_tl { -0.025em }
+%    \end{macrocode}
+% \end{variable}
+% \begin{variable}[internal]{\g_@@_variable_bowshift_tl}
+%    This variable stores the value to shift the bow.
+%    \begin{macrocode}
+\tl_new:N \g_@@_variable_bowshift_tl
+\tl_set:Nn \g_@@_variable_bowshift_tl { -0.15em }
+%    \end{macrocode}
+% \end{variable}
+% \begin{variable}[internal]{\g_@@_variable_bowshortening_tl}
+%    This variable stores the value to shrink the bow.
+%    \begin{macrocode}
+\tl_new:N \g_@@_variable_bowshortening_tl
+\tl_set:Nn \g_@@_variable_bowshortening_tl { 0.15em }
+%    \end{macrocode}
+% \end{variable}
+% \begin{variable}[internal]{\g_@@_variable_bowlooseness_tl}
+%    This variable stores the value to shrink the bow.
+%    \begin{macrocode}
+\tl_new:N \g_@@_variable_bowlooseness_tl
+\tl_set:Nn \g_@@_variable_bowlooseness_tl { 0.75 }
+%    \end{macrocode}
+% \end{variable}
+% \begin{variable}[internal]
+%  {\g_@@_variable_symbolcolor_tl,\g_@@_variable_accentcolor_tl,g_@@_variable_bowcolor_tl}
+%    These variables store the color of symbols, accents and bows.
+%    \begin{macrocode}
+\tl_new:N \g_@@_variable_symbolcolor_tl
+\tl_set:Nn \g_@@_variable_symbolcolor_tl { black }
+\tl_new:N \g_@@_variable_accentcolor_tl
+\tl_set:Nn \g_@@_variable_accentcolor_tl { black }
+\tl_new:N \g_@@_variable_bowcolor_tl
+\tl_set:Nn \g_@@_variable_bowcolor_tl { black }
+%    \end{macrocode}
+% \end{variable}
+% \begin{variable}[internal]
+%  {\g_@@_variable_highlightcolor_tl}
+%    These variable stores the color used in the +colored highlight+ style.
+%    \begin{macrocode}
+\tl_new:N \g_@@_variable_highlightcolor_tl
+\tl_set:Nn \g_@@_variable_highlightcolor_tl { red }
+%    \end{macrocode}
+% \end{variable}
+% \begin{variable}[internal]
+%  {\g_@@_variable_fillcolor_tl}
+%    These variable stores the color used in the +filled highlight+ style.
+%    \begin{macrocode}
+\tl_new:N \g_@@_variable_fillcolor_tl
+\tl_set:Nn \g_@@_variable_fillcolor_tl { yellow }
+%    \end{macrocode}
+% \end{variable}
+% \begin{variable}[internal]{\g_@@_variable_breakgap_tl}
+%    This variable stores the width of the gap around the two break symbols.
+%    \begin{macrocode}
+\tl_new:N \g_@@_variable_breakgap_tl
+\tl_set:Nn \g_@@_variable_breakgap_tl { 0.6em }
+%    \end{macrocode}
+% \end{variable}
+% \begin{variable}[internal]{\g_@@_variable_emptywidth_tl}
+%    This variable stores the width of the gap caused by an empty symbol (abbreviation +e+).
+%    \begin{macrocode}
+\tl_new:N \g_@@_variable_emptywidth_tl
+\tl_set:Nn \g_@@_variable_emptywidth_tl { 1em }
+%    \end{macrocode}
+% \end{variable}
+% \begin{variable}[internal]{\l_@@_words_tl}
+%    This list stores the words of the \cs{metrics} macro.
+%    \begin{macrocode}
+\tl_new:N \l_@@_words_tl
+%    \end{macrocode}
+% \end{variable}
+% \begin{variable}[internal]{\l_@@_syllables_seq}
+%    This list stores the words of the \cs{l_@@_words_tl} list.
+%    \begin{macrocode}
+\seq_new:N \l_@@_syllables_seq
+%    \end{macrocode}
+% \end{variable}
+% \begin{variable}[internal]{\l_@@_symbols_seq}
+%    This list stores the metric symbols of \cs{metrics} and \cs{metricsymbols}.
+%    \begin{macrocode}
+\seq_new:N \l_@@_symbols_seq
+%    \end{macrocode}
+% \end{variable}
+% \begin{variable}[internal]{\l_@@_highlights_prop}
+%    This list stores the higlighting styles of \cs{metrics} and \cs{metricsymbols}.
+%    \begin{macrocode}
+\prop_new:N \l_@@_highlights_prop
+%    \end{macrocode}
+% \end{variable}
+% \begin{variable}[internal]{\l_@@_highlight_seq,\l_@@_highlight_pos_seq}
+%    This lists are used to evaluate a higlight style.
+%    \begin{macrocode}
+\seq_new:N \l_@@_highlight_seq
+\seq_new:N \l_@@_highlight_pos_seq
+%    \end{macrocode}
+% \end{variable}
+% \begin{variable}[internal]{\q_@@_space_marker}
+%    This is the marker for spaces inside of the \cs{l_@@_words_tl} list.
+%    \begin{macrocode}
+\quark_new:N \q_@@_space_marker
+%    \end{macrocode}
+% \end{variable}
+% \begin{variable}[internal]{\l_@@_process_int}
+%    This process counter is used to combine the symbols and syllables.
+%    \begin{macrocode}
+\int_new:N \l_@@_process_int
+%    \end{macrocode}
+% \end{variable}
+% \begin{variable}[internal]{\l_@@_short_syllable_bool,\l_@@_syllable_box,\g_@@_variable_shortsyllablelimit_tl}
+%    This boolean can be used to store that a syllable is short, e.g. \emph{li} will be defined
+%    as short wheras \emph{man} is long. That will be used to shorten the |_| symbol. Furthermore
+%    we'll need a box to measure the length of a syllable and a variable to save the limit for
+%    short syllables.
+%    \begin{macrocode}
+\bool_new:N \l_@@_short_syllable_bool
+\box_new:N \l_@@_syllable_box
+\tl_new:N \g_@@_variable_shortsyllablelimit_tl
+\tl_set:Nn \g_@@_variable_shortsyllablelimit_tl { 0.8em }
+%    \end{macrocode}
+% \end{variable}
+%
+% \subsection{Variants}
+% Later we'll need the following variant.
+%    \begin{macrocode}
+\cs_generate_variant:Nn \prop_get:Nn { No , Nf , NV , Nx }
+\cs_generate_variant:Nn \prop_put:Nnn { Nnx , Nxx , Nff  , Noo }
+\cs_generate_variant:Nn \seq_item:Nn { Nf , NV , Nx }
+\cs_generate_variant:Nn \seq_set_split:Nnn { Nnf , NnV , Nnx }
+%    \end{macrocode}
+%
+% \subsection{Internal main macros}
+% \begin{macro}[internal]{\@@_metrics:nn}
+%    This macro processes the two lists of \cs{metrics} and combines the symbols
+%    and syllables.\footnote{The framing of this macro was provided by Enrico Gregorio at
+%    \url{http://tex.stackexchange.com/q/124528/4918}, a follow up question 
+%    was \url{http://tex.stackexchange.com/q/124698/4918}. David Carlisle and Bruno Le Floch
+%    lead me to the implementation of the highlighting mechanism, see 
+%    \url{http://tex.stackexchange.com/q/124782/4918}}
+%    \begin{macrocode}
+\cs_new_protected:Npn \@@_metrics:nn #1 #2
+ {
+  \tl_set:Nx \l_@@_words_tl { \tl_trim_spaces:n { #2 } }
+%    \end{macrocode}
+%    First replace the spaces by a special marker \cs{q_@@_space_marker} and add
+%    hyphens: a space becomes a syllable.
+%    \begin{macrocode}
+  \tl_replace_all:Nnn \l_@@_words_tl { ~ } { - \q_@@_space_marker - }
+%    \end{macrocode}
+%    Then split the word list at hypens.
+%    \begin{macrocode}
+  \seq_set_split:NnV \l_@@_syllables_seq { - } \l_@@_words_tl
+%    \end{macrocode}
+%    Split the symbol list at spaces
+%    \begin{macrocode}
+  \seq_set_split:Nnx \l_@@_symbols_seq { ~ } { \tl_trim_spaces:n { #1 } }
+%    \end{macrocode}
+%    Test whether both lists got the same length:
+%    \begin{macrocode}
+  \int_zero:N \l_@@_process_int
+  \seq_map_inline:Nn \l_@@_syllables_seq
+   {
+    \tl_if_eq:nnT { ##1 } { \q_@@_space_marker }
+     { \int_incr:N \l_@@_process_int }
+   }
+  \int_compare:nTF
+   {
+    \seq_count:N \l_@@_syllables_seq -
+      \seq_count:N \l_@@_symbols_seq = \l_@@_process_int
+   }
+   {
+%    \end{macrocode}
+%    continue with list processing, if the numbers are equal:
+%    \begin{macrocode}
+    \int_zero:N \l_@@_process_int
+    \seq_map_inline:Nn \l_@@_syllables_seq
+     {
+      \int_incr:N \l_@@_process_int
+      \tl_if_eq:nnTF { ##1 } { \q_@@_space_marker }
+       {
+%    \end{macrocode}
+%    If the syllable is a space the process counter must be decremented and
+%    a space is typeset.
+%    \begin{macrocode}
+        \int_add:Nn \l_@@_process_int { -1 }
+        \c_space_token
+       }
+       {
+%    \end{macrocode}
+%    Finally typeset the syllable and it's symbol.
+%    \begin{macrocode}
+        \str_case:nnn { ##1 } 
+         {
+          { | }
+           {
+            \@@_break_node:n { \@@_l_break: }
+           }
+          { || }
+           {
+            \@@_break_node:n { \@@_ll_break: }
+           }
+         }
+         {
+          \@@_print_syllable:n { ##1 }
+         }
+       }
+     }
+   }
+%    \end{macrocode}
+%    send an error, else.
+%    \begin{macrocode}
+   {
+    \@@_error_msg:n
+     {
+      Numbers~of~symbols~(\seq_count:N \l_@@_symbols_seq)~and~syllables~
+      (\int_eval:n
+        {
+         \seq_count:N \l_@@_syllables_seq - \l_@@_process_int
+        }
+      )~mismatch.
+     }
+   }
+ }
+%    \end{macrocode}
+% \end{macro}
+% \begin{macro}[internal]{\@@_metricsymbols:n}
+%    This macro works like \cs{\@@_metrics} but is used to print stand alone metric
+%    symbols via \cs{metricsymbols}.
+%    \begin{macrocode}
+\cs_new_protected:Npn \@@_metricsymbols:n #1
+ {
+  \seq_set_split:Nnx \l_@@_symbols_seq { ~ } { \tl_trim_spaces:n { #1 } }
+  \int_zero:N \l_@@_process_int
+  \seq_map_inline:Nn \l_@@_symbols_seq
+   {
+    \int_incr:N \l_@@_process_int
+    \int_compare:nT { \l_@@_process_int > 1 }
+     {
+      \hspace{\usemetrixvar{symbolsep}}
+     }
+    \str_case:nnn { ##1 } 
+     {
+      { |  }
+       {
+        \@@_break_gap:
+        \@@_align_symbol:n { \@@_l_bigmark:  }
+        \@@_break_gap:
+       }
+      { || }
+       {
+        \@@_break_gap:
+        \@@_align_symbol:n { \@@_ll_bigmark: }
+        \@@_break_gap:
+       }
+     }
+     {
+      \@@_align_symbol:n { \@@_print_symbol: }
+     }
+   }
+ }
+%    \end{macrocode}
+% \end{macro}
+% \begin{macro}[internal]{\@@_print_syllable:n}
+%    This macro combines a single syllable and the corrosponding metric symbol
+%    taken frome the symbol list index with the process counter.
+%    \begin{macrocode}
+\cs_new_protected:Npn \@@_print_syllable:n #1
+ {
+  \group_begin:
+%    \end{macrocode}
+%    Check wether the current syllable is short or long and set the corresponding bbol.
+%    \begin{macrocode}
+   \hbox_set:Nn \l_@@_syllable_box { #1 }
+   \dim_compare:nTF { \box_wd:N \l_@@_syllable_box < \g_@@_variable_shortsyllablelimit_tl }
+      { \bool_set_true:N \l_@@_short_syllable_bool }
+      { \bool_set_false:N \l_@@_short_syllable_bool }
+%    \end{macrocode}
+%    Set up the currend highlight is it is definded
+%    \begin{macrocode}
+   \cs_set:Npx \@@_current_highlight: {
+    \prop_get:NV \l_@@_highlights_prop \l_@@_process_int
+   }
+   \expandafter\tikzset\expandafter{\@@_current_highlight:}
+%    \end{macrocode}
+%    Finally print the syllable and the symbol above. Use +{pgfinterruptboundingbox}+
+%    so that the symbol doesn't takes space ad doesn't cause gaps between the syllables.
+%    \begin{macrocode}
+   \begin{tikzpicture}
+    [
+     baseline=(l_@@_syllable_node.base),
+    ]
+    \node [every~metrix~syllable~node] (l_@@_syllable_node) {#1};
+    \begin{pgfinterruptboundingbox}
+     \node [every~metrix~symbol~node]
+      at ($(l_@@_syllable_node.base)+(0,\usemetrixvar{symbolshift})
+      +(\tl_use:N \l_@@_internal_itcorrection_tl,0)$)
+      { \@@_print_symbol: };
+    \end{pgfinterruptboundingbox}
+   \end{tikzpicture}
+  \group_end:
+ }
+%    \end{macrocode}
+% \end{macro}
+% \begin{macro}[internal]{\@@_print_symbol:}
+%    This command selects the right symbol by it's abbreviation.
+%    \begin{macrocode}
+\cs_new_protected:Npn \@@_print_symbol:
+ {
+  \cs_if_exist_use:cF
+   {
+    @@_\seq_item:Nn \l_@@_symbols_seq
+    { \l_@@_process_int }_mark:
+   }
+   {
+    \@@_error_msg:n
+     {
+      Unknown~symbol~abbreviation~'\seq_item:Nn 
+       \l_@@_symbols_seq { \l_@@_process_int }'.
+     }
+   }
+ }
+%    \end{macrocode}
+% \end{macro}
+%
+% \subsection{Internal auxiliary macros}
+%
+% \begin{macro}[internal]{\@@_error_msg:n}
+%    An abbreviation to throw an error message.
+%    \begin{macrocode}
+\cs_new_protected:Npn \@@_error_msg:n #1
+ {
+  \PackageError{ \metrixFileName } { #1 }
+   {
+    Please take a look at the manual or send an email.
+   }
+ }
+%    \end{macrocode}
+% \end{macro}
+%
+% \begin{macro}[internal]{\@@_warning_msg:n}
+%    An abbreviation to throw an error message.
+%    \begin{macrocode}
+\cs_new_protected:Npn \@@_warning_msg:n #1
+ {
+    \PackageWarning{ \metrixFileName } { #1 }
+ }
+%    \end{macrocode}
+% \end{macro}
+%
+% \begin{macro}[internal]{\@@_align_symbol:n}
+%    This macro alings the metric symbols in a stand alone list.
+%    \begin{macrocode}
+\cs_new_protected:Npn \@@_align_symbol:n #1
+ {
+  \group_begin:
+   \cs_set:Npx \@@_current_highlight: {
+    \prop_get:NV \l_@@_highlights_prop \l_@@_process_int
+   }
+   \expandafter\tikzset\expandafter{\@@_current_highlight:}
+   \begin{tikzpicture}
+    [
+     baseline={(0,-0.25*\usemetrixvar{baseunit})},
+    ]
+     \node [every~metrix~symbol~node] {#1};
+   \end{tikzpicture}
+  \group_end:
+ }
+%    \end{macrocode}
+% \end{macro}
+% \begin{macro}[internal]{\@@_break_gap:}
+%    This macro typsets the gap around the two break symbols.
+%    \begin{macrocode}
+\cs_new_protected:Npn \@@_break_gap: 
+ {
+  \hspace{\usemetrixvar{breakgap}}
+ }
+%    \end{macrocode}
+% \end{macro}
+% \begin{macro}[internal]{\@@_break_node:n}
+%    This macro typsets the gap around the two break symbols.
+%    \begin{macrocode}
+
+\cs_new:Npn \@@_break_node:n #1
+ {
+  \group_begin:
+   \cs_set:Npx \@@_current_highlight: {
+    \prop_get:NV \l_@@_highlights_prop \l_@@_process_int
+   }
+   \expandafter\tikzset\expandafter{\@@_current_highlight:}
+   \tikz[baseline=(l_@@_break_node.base)]
+    \node (l_@@_break_node) [every~metrix~break~node] { #1 }
+   ;
+  \group_end:
+ }
+
+
+
+%    \end{macrocode}
+% \end{macro}
+% \begin{macro}[internal]{\@@_e_gap:}
+%    This macro typsets the gap around the two break symbols.
+%    \begin{macrocode}
+\cs_new_protected:Npn \@@_e_gap: 
+ {
+  \hspace*{\usemetrixvar{emptywidth}}
+ }
+%    \end{macrocode}
+% \end{macro}
+% \begin{macro}[internal]{\@@_evaluate_higlights:N}
+%    This macro typsets the gap around the two break symbols.
+%    \begin{macrocode}
+\cs_new_protected:Npn \@@_evaluate_higlights:n #1
+ {
+%    \end{macrocode}
+% Start with clearing the property list, otherwise the highlights from
+% the last time will survive.
+%    \begin{macrocode}
+  \prop_clear:N \l_@@_highlights_prop
+%    \end{macrocode}
+% Then spilt and process the argument as a comma separated list.
+%    \begin{macrocode}
+  \clist_map_inline:nn { #1 }
+   {
+%    \end{macrocode}
+% The result is a sequence of key value pairs that we store in
+% \cs{l_@@_highlight_seq}. The first part of this sequence must
+% be split again at the plus sign---store it in \cs{l_@@_highlight_pos_seq}.
+%    \begin{macrocode}
+    \seq_set_split:Nnn \l_@@_highlight_seq { = } { ##1 }
+    \seq_set_split:Nnf \l_@@_highlight_pos_seq { + }
+     {
+      \seq_item:Nn \l_@@_highlight_seq { 1 }
+     }
+%    \end{macrocode}
+% Process the \cs{l_@@_highlight_pos_seq} list and set up the property list:
+%    \begin{macrocode}
+    \seq_map_inline:Nn \l_@@_highlight_pos_seq
+     {
+      \prop_put:Nnx \l_@@_highlights_prop
+%    \end{macrocode}
+% The key is the current item of \cs{l_@@_highlight_pos_seq}.
+%    \begin{macrocode}
+       {
+        ####1
+       }
+       {
+%    \end{macrocode}
+% The value is the second item of \cs{l_@@_highlight_seq}.
+%    \begin{macrocode}
+        \seq_item:Nn \l_@@_highlight_seq { 2 }
+       }
+     }
+   }
+ }
+%    \end{macrocode}
+% \end{macro}
+%
+% \subsection{Patching font macros}
+% To apply the italic correction of the accents we need to patch the font switches.
+%    \begin{macrocode}
+\xpretocmd { \itshape }
+ {
+  \tl_set_eq:NN
+   \l_@@_internal_itcorrection_tl
+   \g_@@_variable_itcorrection_tl
+ }
+ { }
+ {
+  \@@_warning_msg:n { Could~not~patch~\string\itshape. }
+ }
+\xpretocmd { \slshape }
+ {
+  \tl_set_eq:NN
+   \l_@@_internal_itcorrection_tl
+   \g_@@_variable_itcorrection_tl
+ }
+ { }
+ {
+  \@@_warning_msg:n { Could~not~patch~\string\slshape. }
+ }
+\xpretocmd { \upshape }
+ {
+  \tl_set_eq:NN
+   \l_@@_internal_itcorrection_tl
+   \g_@@_internal_itcorrection_zero_tl
+ }
+ { }
+ {
+  \@@_warning_msg:n { Could~not~patch~\string\upshape. }
+ }
+\xpretocmd { \normalfont }
+ {
+  \tl_set_eq:NN
+   \l_@@_internal_itcorrection_tl
+   \g_@@_internal_itcorrection_zero_tl
+ }
+ { }
+ {
+  \@@_warning_msg:n { Could~not~patch~\string\normalfont. }
+ }
+%    \end{macrocode}
+%
+% \subsection{Internal macros for metric symbols}
+%
+% \begin{macro}[internal]{\@@_e_mark:}
+%    The empty symbol.
+%    \begin{macrocode}
+\cs_new:Npn \@@_e_mark: { \@@_e_gap: }
+%    \end{macrocode}
+% \end{macro}
+% \begin{macro}[internal]{\@@_u_mark:}
+%    The brevis symbol \metricsymbols*{u}.
+%    \begin{macrocode}
+\cs_new:Npn \@@_u_mark:
+ {
+  \begin{tikzpicture}[every~metrix~symbol]
+   \draw (0,0) arc [start~angle=0, end~angle=180, radius=-0.225];
+  \end{tikzpicture}
+ }
+%    \end{macrocode}
+% \end{macro}
+% \begin{macro}[internal]{\@@___mark:}
+%    The longa symbol \MakePrivateLetters\metricsymbols*{_}.
+%    \begin{macrocode}
+\cs_new:Npn \@@___mark:
+ {
+  \bool_if:NTF \l_@@_short_syllable_bool
+   {
+    \begin{tikzpicture}[every~metrix~symbol]
+     \draw (0,0) -- ++(0.4,0);
+    \end{tikzpicture}
+   }
+   {
+    \begin{tikzpicture}[every~metrix~symbol]
+     \draw (0,0) -- ++(0.75,0);
+    \end{tikzpicture}
+   }
+ }
+%    \end{macrocode}
+% \end{macro}
+% \begin{macro}[internal]{\@@_uu_mark:}
+%    The biceps symbol \MakePrivateLetters\metricsymbols*{uu_}.
+%    \begin{macrocode}
+\cs_new:Npn \@@_uu_mark:
+ {
+  \begin{tikzpicture}[every~metrix~symbol]
+   \draw (0,0) arc [start~angle=0, end~angle=180, radius=-0.2];
+   \draw ($(0.4,0)+(\pgflinewidth,0)+(\usemetrixvar{gap},0)$) arc
+    [start~angle=0, end~angle=180, radius=-0.2];
+  \end{tikzpicture}
+ }
+%    \end{macrocode}
+% \end{macro}
+% \begin{macro}[internal]{\@@_uu__mark:}
+%    The biceps symbol \MakePrivateLetters\metricsymbols*{uu_}.
+%    \begin{macrocode}
+\cs_new:Npn \@@_uu__mark:
+ {
+  \begin{tikzpicture}[every~metrix~symbol]
+   \draw (0,0) arc [start~angle=0, end~angle=180, radius=-0.2];
+   \draw ($(0.4,0)+(\pgflinewidth,0)+(\usemetrixvar{gap},0)$) arc
+    [start~angle=0, end~angle=180, radius=-0.2];
+   \draw ($(0,-0.2)+(-0.5\pgflinewidth,-\pgflinewidth)-(0,\usemetrixvar{gap})$) --
+    ($(0.8,-0.2)+(1.5\pgflinewidth,-\pgflinewidth)
+    +(\usemetrixvar{gap},-\usemetrixvar{gap})$);
+  \end{tikzpicture}
+ }
+%    \end{macrocode}
+% \end{macro}
+% \begin{macro}[internal]{\@@__uu_mark:}
+%    Another biceps symbol \MakePrivateLetters\metricsymbols*{_uu}.
+%    \begin{macrocode}
+\cs_new:Npn \@@__uu_mark:
+ {
+  \begin{tikzpicture}[every~metrix~symbol]
+   \draw (0,0) arc [start~angle=0, end~angle=180, radius=-0.2];
+   \draw ($(0.4,0)+(\pgflinewidth,0)+(\usemetrixvar{gap},0)$) arc
+    [start~angle=0, end~angle=180, radius=-0.2];
+   \draw ($(0,0)+(-0.5\pgflinewidth,0.5\pgflinewidth)+(0,\usemetrixvar{gap})$) --
+    ($(0.8,0)+(1.5\pgflinewidth,0.5\pgflinewidth)
+    +(\usemetrixvar{gap},\usemetrixvar{gap})$);
+  \end{tikzpicture}
+ }
+%    \end{macrocode}
+% \end{macro}
+% \begin{macro}[internal]{\@@_u_uu_mark:}
+%    An another biceps symbol \MakePrivateLetters\metricsymbols*{u_uu}.
+%    \begin{macrocode}
+\cs_new:Npn \@@_u_uu_mark:
+ {
+  \begin{tikzpicture}[every~metrix~symbol]
+   \draw (0,0) arc [start~angle=0, end~angle=180, radius=-0.2];
+   \draw ($(0.4,0)+(\pgflinewidth,0)+(\usemetrixvar{gap},0)$) arc
+    [start~angle=0, end~angle=180, radius=-0.2];
+   \draw ($(0,0)+(-0.5\pgflinewidth,0.5\pgflinewidth)+(0,\usemetrixvar{gap})$) --
+    ($(0.8,0)+(1.5\pgflinewidth,0.5\pgflinewidth)
+    +(\usemetrixvar{gap},\usemetrixvar{gap})$);
+   \draw ($(0.2,0.2)+(0.5\pgflinewidth,1.5\pgflinewidth)
+   +(0.5*\usemetrixvar{gap},2*\usemetrixvar{gap})$)
+    arc [start~angle=0, end~angle=180, radius=-0.2];
+  \end{tikzpicture}
+ }
+%    \end{macrocode}
+% \end{macro}
+% \begin{macro}[internal]{\@@_x_mark:}
+%    The anceps symbol \metricsymbols*{x}.
+%    \begin{macrocode}
+\cs_new:Npn \@@_x_mark:
+ {
+  \begin{tikzpicture}[every~metrix~symbol]
+   \draw (-0.2,0.2) -- (0.2,-0.2);
+   \draw (-0.2,-0.2) -- (0.2,0.2);
+  \end{tikzpicture}
+ }
+%    \end{macrocode}
+% \end{macro}
+% \begin{macro}[internal]{\@@_oo_mark:}
+%    The aeolic symbol \metricsymbols*{oo}.
+%    \begin{macrocode}
+\cs_new:Npn \@@_oo_mark:
+ {
+  \begin{tikzpicture}[every~metrix~symbol]
+   \draw (0,0) circle [radius=0.2];
+   \draw ($(0.4,0)+(1\pgflinewidth,0)+(\usemetrixvar{gap},0)$) circle [radius=0.2];
+  \end{tikzpicture}
+ }
+%    \end{macrocode}
+% \end{macro}
+% \begin{macro}[internal]{\@@_u__mark:}
+%    The indifferent symbol \MakePrivateLetters\metricsymbols*{u_}.
+%    \begin{macrocode}
+\cs_new:Npn \@@_u__mark:
+ {
+  \begin{tikzpicture}[every~metrix~symbol]
+   \draw (0,0) arc [start~angle=0, end~angle=180, radius=-0.2];
+   \draw ($(0,-0.2)+(-0.5\pgflinewidth,-\pgflinewidth)-(0,\usemetrixvar{gap})$) --
+    ($(0.4,-0.2)+(0.5\pgflinewidth,-\pgflinewidth)
+    +(0,-\usemetrixvar{gap})$);
+   \fill [red] circle (0.2pt);
+  \end{tikzpicture}
+ }
+%    \end{macrocode}
+% \end{macro}
+% \begin{macro}[internal]{\@@_n_mark:}
+%    An alternative indifferent symbol \metricsymbols*{n}.
+%    \begin{macrocode}
+\cs_new:Npn \@@_n_mark:
+ {
+  \begin{tikzpicture}[every~metrix~symbol]
+   \draw (0,0) arc [start~angle=0, end~angle=180, radius=0.225];
+   \fill (-0.225,0.75*\usemetrixvar{symbollinewidth})
+    circle [radius=0.7\pgflinewidth];
+  \end{tikzpicture}
+ }
+%    \end{macrocode}
+% \end{macro}
+% \begin{macro}[internal]{\@@_l_mark:}
+%    The simple break symbol \metricsymbols*{|} (above syllables).
+%    \begin{macrocode}
+\cs_new:Npn \@@_l_mark:
+ {
+  \begin{tikzpicture}[every~metrix~symbol]
+   \draw (0,0) -- (0,0.5);
+  \end{tikzpicture}
+ }
+%    \end{macrocode}
+% \end{macro}
+% \begin{macro}[internal]{\@@_ll_mark:}
+%    The verse break symbol \metricsymbols*{||} (above syllables).
+%    \begin{macrocode}
+\cs_new:Npn \@@_ll_mark:
+ {
+  \begin{tikzpicture}[every~metrix~symbol]
+   \draw (0,0) -- (0,0.5);
+   \draw ($(\pgflinewidth,0)+(1.5*\usemetrixvar{gap},0)$) -- ++(0,0.5);
+  \end{tikzpicture}
+ }
+%    \end{macrocode}
+% \end{macro}
+% \begin{macro}[internal]{\@@_l_bigmark:}
+%    The simple break symbol \metricsymbols*{|} (stand alone version).
+%    \begin{macrocode}
+\cs_new:Npn \@@_l_bigmark:
+ {
+  \begin{tikzpicture}[every~metrix~symbol]
+   \draw (0,0) -- (0,0.8);
+  \end{tikzpicture}
+ }
+%    \end{macrocode}
+% \end{macro}
+% \begin{macro}[internal]{\@@_ll_bigmark:}
+%    The verse break symbol \metricsymbols*{||} (stand alone version).
+%    \begin{macrocode}
+\cs_new:Npn \@@_ll_bigmark:
+ {
+  \begin{tikzpicture}[every~metrix~symbol]
+   \draw (0,0) -- (0,0.8);
+   \draw ($(\pgflinewidth,0)+(1.5*\usemetrixvar{gap},0)$) -- ++(0,0.8);
+  \end{tikzpicture}
+ }
+%    \end{macrocode}
+% \end{macro}
+% \begin{macro}[internal]{\@@_l_break}
+%    The simple break symbol \metricsymbols*{|} (between syllables with symbols).
+%    \begin{macrocode}
+\cs_new:Npn \@@_l_break:
+ {
+  \begin{tikzpicture}[every~metrix~symbol,baseline=0.05em]
+   \draw [shorten~<=-0.2em] (0,\usemetrixvar{symbolshift})
+    -- (0,0) -- (0,0.8em) -- (0,\usemetrixvar{symbolshift});
+  \end{tikzpicture}
+ }
+%    \end{macrocode}
+% \end{macro}
+% \begin{macro}[internal]{\@@_ll_break}
+%    The verse break symbol \metricsymbols*{||} (between syllables with symbols).
+%    \begin{macrocode}
+\cs_new:Npn \@@_ll_break:
+ {
+  \begin{tikzpicture}[every~metrix~symbol,baseline=0.05em]
+   \draw [shorten~<=-0.2em] (0,\usemetrixvar{symbolshift})
+    -- (0,0) -- (0,0.8em) -- (0,\usemetrixvar{symbolshift});
+   \draw 
+    [
+     shift={($(\pgflinewidth,0)+(1.5*\usemetrixvar{gap},0)$)},
+     shorten~<=-0.2em,
+    ]
+    (0,\usemetrixvar{symbolshift}) -- (0,0) -- (0,0.8em)
+    -- (0,\usemetrixvar{symbolshift});
+  \end{tikzpicture}
+ }
+%    \end{macrocode}
+% \end{macro}
+%
+% \subsection{User level macros}
+%
+% \begin{macro}{\setmetrixvar}
+%    This macro saves the value to an internal variable.
+%    \begin{macrocode}
+\NewDocumentCommand{ \setmetrixvar }{ m m }
+ {
+  \tl_if_exist:cTF { g_@@_variable_#1_tl } {
+   \tl_set:cn { g_@@_variable_#1_tl } { #2 }
+  }
+  {
+   \@@_error_msg:n { Unknown~variable~'#1'. }
+  }
+ }
+%    \end{macrocode}
+% \end{macro}
+% \begin{macro}{\usemetrixvar}
+%    With this command one can access the value of an internal variable.\footnote{Marco Daniel
+%    showed me this hint at \url{http://tex.stackexchange.com/q/124600/4918}.}
+%    \begin{macrocode}
+\DeclareExpandableDocumentCommand{ \usemetrixvar }{ m }
+ {
+  \tl_if_exist:cTF { g_@@_variable_#1_tl } {
+   \tl_use:c { g_@@_variable_#1_tl }
+  }
+  {
+   \@@_error_msg:n { Unknown~variable~'#1'. }
+  }
+ }
+%    \end{macrocode}
+% \end{macro}
+% \begin{macro}{\metrics}
+%    This user macro calls \cs{\@@_metrics} to typset syllables with symbols.
+%    \begin{macrocode}
+\NewDocumentCommand { \metrics } { O{} m m }
+ {
+  \@@_evaluate_higlights:n { #1 }
+  \@@_metrics:nn { #2 } { #3 }
+ }
+%    \end{macrocode}
+% \end{macro}
+% \begin{macro}{\metricsymbols}
+%    This command typesets stand alone symbols. The starred version prints smaller versions.
+%    \begin{macrocode}
+\NewDocumentCommand { \metricsymbols } { s O{} m }
+ {
+  \group_begin:
+   \IfBooleanF { #1 } { \tikzset{every~metrix~symbol/.style={every~metrix~big~symbol}} }
+   \@@_evaluate_higlights:n { #2 }
+   \@@_metricsymbols:n { #3 }
+  \group_end:
+ }
+%    \end{macrocode}
+% \end{macro}
+% \begin{macro}{\lng}
+%    This macro prints the longa accent above it's argument.
+%    \begin{macrocode}
+\NewDocumentCommand { \lng } { m }
+ {
+  \begin{tikzpicture}[baseline=(l_@@_syllable_node.base),every~metrix~accent]
+   \node [every~metrix~syllable~node] (l_@@_syllable_node) {#1};
+   \begin{pgfinterruptboundingbox}
+   \draw
+    ($(l_@@_syllable_node.north)
+    - (\usemetrixvar{lngminlength}/2,0)
+    +(\usemetrixvar{accentxshift},\usemetrixvar{lngshift})
+    + (\tl_use:N \l_@@_internal_itcorrection_tl,0)$)
+    --
+    ($(l_@@_syllable_node.north)
+    + (\usemetrixvar{lngminlength}/2,0)
+    +(\usemetrixvar{accentxshift},\usemetrixvar{lngshift})
+    + (\tl_use:N \l_@@_internal_itcorrection_tl,0)$)
+
+    ($(l_@@_syllable_node.north~west)
+    +(\usemetrixvar{lngshortening}+\usemetrixvar{accentxshift},\usemetrixvar{lngshift})
+    + (\tl_use:N \l_@@_internal_itcorrection_tl,0)$)
+    --
+    ($(l_@@_syllable_node.north~east)
+    +(-\usemetrixvar{lngshortening}+\usemetrixvar{accentxshift},\usemetrixvar{lngshift})
+    + (\tl_use:N \l_@@_internal_itcorrection_tl,0)$)
+   ;
+   \end{pgfinterruptboundingbox}
+  \end{tikzpicture}%
+ }
+%    \end{macrocode}
+% \end{macro}
+% \begin{macro}{\brv}
+%    This macro prints the brevis accent above it's argument.
+%    \begin{macrocode}
+\NewDocumentCommand { \brv } { m }
+ {
+  \begin{tikzpicture}[baseline=(l_@@_syllable_node.base),every~metrix~accent]
+   \node [every~metrix~syllable~node] (l_@@_syllable_node) {#1};
+   \begin{pgfinterruptboundingbox}
+   \draw ($(l_@@_syllable_node.north)+(-0.15,0)
+    + (\usemetrixvar{accentxshift},\usemetrixvar{brvshift})
+    + (\tl_use:N \l_@@_internal_itcorrection_tl,0)$)
+    arc [start~angle=0, end~angle=180, radius=-0.15];
+   \end{pgfinterruptboundingbox}
+  \end{tikzpicture}
+ }
+%    \end{macrocode}
+% \end{macro}
+% \begin{macro}{\brv}
+%    This macro prints the dot accent below it's argument.
+%    \begin{macrocode}
+\NewDocumentCommand { \acct } { m }
+ {
+  \begin{tikzpicture}[baseline=(l_@@_syllable_node.base),every~metrix~accent]
+   \node [every~metrix~syllable~node] (l_@@_syllable_node) {#1};
+   \begin{pgfinterruptboundingbox}
+   \fill ($(l_@@_syllable_node.south)
+    + (0,\usemetrixvar{dotshift})$)
+    circle [radius=1.25\pgflinewidth];
+   \end{pgfinterruptboundingbox}
+  \end{tikzpicture}
+ }
+%    \end{macrocode}
+% \end{macro}
+% \begin{macro}{\bow}
+%    This macro prints the bow below it's argument.
+%    \begin{macrocode}
+\NewDocumentCommand { \bow } { m }
+ {
+  \begin{tikzpicture}[baseline=(l_@@_syllable_node.base),every~metrix~bow]
+   \node [every~metrix~syllable~node] (l_@@_syllable_node) {#1};
+   \draw ($(l_@@_syllable_node.base~west)+
+    (\usemetrixvar{bowshortening},\usemetrixvar{bowshift})$)
+    to [out=-45, in=225,looseness=\usemetrixvar{bowlooseness}] ($(l_@@_syllable_node.base~east)+
+    (-\usemetrixvar{bowshortening},\usemetrixvar{bowshift})$);
+  \end{tikzpicture}
+ }
+%    \end{macrocode}
+% \end{macro}
+%
+% \subsection{\TikZ styles}
+% The \metrix package uses several \TikZ sytles to draw the macros.
+%    \begin{macrocode}
+\ExplSyntaxOff
+\tikzset {
+ every metrix symbol/.style={
+  line width=\usemetrixvar{symbollinewidth},
+  color=\usemetrixvar{symbolcolor},
+  x=\usemetrixvar{baseunit},y=\usemetrixvar{baseunit},
+ },
+ every metrix big symbol/.style={
+  line width=\usemetrixvar{bigsymbollinewidth},
+  color=\usemetrixvar{symbolcolor},
+  x=\usemetrixvar{bigbaseunit},y=\usemetrixvar{bigbaseunit},
+ },
+ every metrix symbol node/.style={
+  inner sep=0pt, anchor=center, 
+ },
+ every metrix break node/.style={
+  inner sep=0pt, anchor=base, 
+ },
+ every metrix syllable node/.style={
+  inner sep=0pt, anchor=base,
+ },
+ every metrix bow/.style={
+  line width=\usemetrixvar{bowlinewidth},
+  color=\usemetrixvar{bowcolor},
+  x=\usemetrixvar{baseunit},y=\usemetrixvar{baseunit},
+ },
+ every metrix accent/.style={
+  line width=\usemetrixvar{accentlinewidth},
+  color=\usemetrixvar{accentcolor},
+  x=\usemetrixvar{baseunit},y=\usemetrixvar{baseunit},
+ },
+ bold highlight/.style={
+  every metrix symbol/.append style={line width=2\pgflinewidth},
+  every metrix syllable node/.append style={font=\bfseries},
+  every superscript node/.append style={font/.expand once=\tikz@textfont\bfseries},
+ },
+ colored highlight/.style={
+  every metrix symbol/.append style={draw=#1},
+  every metrix syllable node/.append style={text=#1},
+  every superscript node/.append style={text=#1},
+ },
+ colored highlight/.default={
+  \usemetrixvar{highlightcolor}
+ },
+ dashed highlight/.style={
+  every metrix symbol/.append style={dash pattern=on 1pt off 0.4pt},
+ },
+ filled highlight/.style={
+  every metrix symbol node/.append style={inner sep=2pt,fill=#1},
+ },
+ filled highlight/.default={
+  \usemetrixvar{fillcolor},
+ },
+ every superscript picture/.style={
+  baseline=-3ex,
+ },
+ every superscript node/.style={
+  inner sep=0pt,
+  font=\scriptsize,
+ },
+ every superscript label/.style={
+  inner xsep=0pt,
+  inner ysep=-3ex,
+  label distance=0.5pt,
+ },
+ add superscript/.style={
+  label={[every superscript label]right:{%
+   \tikz[every superscript picture]\node at (0,0) [every superscript node] {#1};%
+  }},
+ },
+ superscript/.style={
+  every metrix symbol node/.append style={
+   add superscript=#1,
+  },
+  every metrix break node/.append style={
+   add superscript=#1,
+  },
+ },
+ superscript/.value required,
+}
+\ExplSyntaxOn
+%    \end{macrocode}
+%
+% \subsection{Environments}
+% \begin{macro}{symbolline}
+% Environment to display stand alone symbols.
+%    \begin{macrocode}
+\NewDocumentEnvironment{symbolline} { }
+ {
+  \par\addvspace{\baselineskip}
+  \centering
+ }
+ {
+  \par\vspace{\baselineskip}
+  \noindent\ignorespacesafterend
+ }
+%    \end{macrocode}
+% \end{macro}
+% \begin{macro}[internal]{\@@_print_source:n}
+% The internal macro to print the verse reference inside of +{metricvers}+
+%    \begin{macrocode}
+\cs_new:Npn \@@_print_vers_ref:n #1 
+ {
+     \hspace*{\fill}\nolinebreak[1] \quad \hspace*{\fill} \mbox{\footnotesize #1}
+ }
+%    \end{macrocode}
+% \end{macro}
+% \begin{macro}{metricverses,\verseref}
+% Environment to display a verse with metric symbols and a source. And a macro to print
+% a right aligned reference.
+%    \begin{macrocode}
+\NewDocumentCommand { \verseref } { m }
+ {
+  \@@_error_msg:n {
+   \string\verseref\space can~only~be~used~in~{metricverses}~env.
+  }
+ }
+\NewDocumentEnvironment{metricverses} { }
+ {
+  \RenewDocumentCommand { \verseref } { m }
+   {
+    \@@_print_vers_ref:n { ##1 }
+   }
+  \par
+  \addvspace{0.7\baselineskip}
+  \fp_compare:nT { \usemetrixvar{symbolshift} < 0.0 }
+   {
+    \vspace{\usemetrixvar{symbolshift}}
+   }
+  \addtolength{\baselineskip}{0.6\baselineskip}
+ }
+ {
+  \par
+  \addtolength{\baselineskip}{-0.6\baselineskip}
+  \vspace{\baselineskip}
+  \noindent\ignorespacesafterend
+ }
+%    \end{macrocode}
+% \end{macro}
+%
+%    \begin{macrocode}
+%</package>
+%    \end{macrocode}
+%
+% \end{implementation}
+%
+% \PrintChanges^^A use makeindex -s gglo.ist -o metrix-doc.gls metrix-doc.glo
+%              ^^A use updated=YYYY-MM-DD or new=YYY-MM-DD in {documentation} section
+% \changes{v1.0}{2013/08/12}{Initial version}
+%
+% \PrintIndex^^A use: makeindex -s l3doc.ist -o metrix-doc.ind metrix-doc.idx 
\ No newline at end of file
diff --git a/Master/texmf-dist/source/latex/metrix/metrix.ins b/Master/texmf-dist/source/latex/metrix/metrix.ins
new file mode 100644
index 00000000000..e123f651ef2
--- /dev/null
+++ b/Master/texmf-dist/source/latex/metrix/metrix.ins
@@ -0,0 +1,40 @@
+\iffalse meta-comment
+
+File metrix.ins Copyright (C) 2013 Tobias Weh
+
+It may be distributed and/or modified under the conditions of the
+LaTeX Project Public License (LPPL), either version 1.3c of this
+license or (at your option) any later version.  The latest version
+of this license is in the file
+
+   http://www.latex-project.org/lppl.txt
+
+This file is part of the "l3packages bundle" (The Work in LPPL)
+and all files in that bundle must be distributed together.
+
+The released version of this bundle is available from CTAN.
+
+\fi
+
+\input l3docstrip.tex
+\askforoverwritefalse
+
+%\preamble
+%
+%EXPERIMENTAL CODE
+%
+%Do not distribute this file without also distributing the
+%source files specified above.
+%
+%Do not distribute a modified version of this file.
+%
+%\endpreamble
+%% stop docstrip adding \endinput
+%\postamble
+%\endpostamble
+
+\keepsilent
+
+\generate{\file{metrix.sty} {\from{metrix.dtx} {package}}}
+
+\endbatchfile
\ No newline at end of file