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-% \iffalse meta-comment
-%
-% Copyright 2015
-% The LaTeX3 Project and any individual authors listed elsewhere
-% in this file.
-%
-% This file is part of the LaTeX base system.
-% -------------------------------------------
-%
-% It may be distributed and/or modified under the
-% conditions of the LaTeX Project Public License, either version 1.3c
-% of this license or (at your option) any later version.
-% The latest version of this license is in
-% http://www.latex-project.org/lppl.txt
-% and version 1.3c or later is part of all distributions of LaTeX
-% version 2005/12/01 or later.
-%
-% This file has the LPPL maintenance status "maintained".
-%
-% The list of all files belonging to the LaTeX base distribution is
-% given in the file `manifest.txt'. See also `legal.txt' for additional
-% information.
-%
-% The list of derived (unpacked) files belonging to the distribution
-% and covered by LPPL is defined by the unpacking scripts (with
-% extension .ins) which are part of the distribution.
-%
-% \fi
-% Filename: ltnews23.tex
-%
-% This is issue 23 of LaTeX News.
-
-\documentclass{ltnews}
-\usepackage[T1]{fontenc}
-
-\usepackage{lmodern,url,hologo}
-
-\makeatletter % -- provide command introduced in new release
- % so this typesets with an old format
-
-% Check we are not in the preamble of a composite document
-\def\@tempa{\@latex@error{Can be used only in preamble}\@eha}
-\ifx\DeclareTextCommandDefault\@tempa
-\else
- \DeclareTextCommandDefault\textcommabelow[1]
- {\hmode@bgroup\ooalign{\null#1\crcr\hidewidth\raise-.31ex
- \hbox{\check@mathfonts\fontsize\ssf@size\z@
- \math@fontsfalse\selectfont,}\hidewidth}\egroup}
-\fi
-\makeatother
-
-\publicationmonth{October}
-\publicationyear{2015}
-
-\publicationissue{23}
-
-\begin{document}
-
-\maketitle
-
-\tableofcontents
-
-\section{Enhanced support for \hologo{LuaTeX}}
-
-As noted in \LaTeX\ News 22, the 2015/01/01 release of \LaTeX{}
-introduced built-in support for extended \TeX\ systems.
-
-The range of allocated register numbers (for example, for count
-registers) is now set according to the underlying engine capabilities
-to 256, 32768 or 65536. Additional allocators were also added for the
-facilities added by \hologo{eTeX} (\verb|\newmark|) and \hologo{XeTeX}
-(\verb|\newXeTeXintercharclass|). At that time, however, the work to
-incorporate additional allocators for \hologo{LuaTeX} was not ready for
-distribution.
-
-The main feature of this release is that by default it includes
-allocators for \hologo{LuaTeX}-provided features, such as Lua
-functions, bytecode registers, catcode tables and Lua callbacks.
-Previously these features have been provided by the contributed
-\package{luatex} (Heiko Oberdiek) and \package{luatexbase}
-(\'{E}lie Roux,
- Manuel P\'{e}gouri\'{e}-Gonnard and Philipp Gesang)
-packages. However, just as
-noted with the \package{etex} package in the previous release, it is
-better if allocation is handled by the format to avoid problems with
-conflicts between different allocation schemes, or definitions made
-before a package-defined allocation scheme is enabled.
-
-The facilities incorporated into the format with this release, and
-described below, are closely modelled on the \package{luatexbase}
-package and we thank the authors, and especially \'{E}lie Roux, for
-help in arranging this transition.
-
-The implementation of these \hologo{LuaTeX} features has been
-redesigned to match the allocation system introduced in the 2015/01/01
-\LaTeX\ release, and there are some other differences from the previous
-\package{luatexbase} package. However, as noted below,
-\package{luatexbase} is being updated in line with this \LaTeX\ release
-to provide the previous interface as a wrapper around the new
-implementation, so we expect the majority of documents using
-\package{luatexbase} to work without change.
-
-\subsection{Names of \hologo{LuaTeX} primitive commands}
-
-The 2015/01/01 \LaTeX\ release for the first time initialised
-\hologo{LuaTeX} in \textsf{latex.ltx} if \hologo{LuaTeX} is being
-used. Following the convention used in the contributed
-\textsf{lualatex.ini} file used to set up the format for earlier
-releases, most \hologo{LuaTeX}-specific primitives were defined with
-names prefixed by \texttt{luatex}. This was designed to minimize name
-clashes but had the disadvantage that names did not match the
-\hologo{LuaTeX} manual, or the names used in other formats, and
-produced some awkward command names such as \verb|\luatexluafunction|.
-From this release the names are enabled without the \texttt{luatex}
-prefix.
-
-In practice this change should not affect many documents; relatively
-few packages access the primitive commands, and many of those are
-already set up to work with prefixed or unprefixed names, so that they
-work with multiple formats.
-
-For package writers, if you want to ensure that your code works with
-this and earlier releases, use unprefixed names in the package and
-ensure that they are defined by using code such as:
-\begin{verbatim}
-\directlua{tex.enableprimitives("",
- tex.extraprimitives(
- "omega", "aleph", "luatex"))}
-\end{verbatim}
-Conversely if your document uses a package relying on prefixed names
-then you can add:
-\begin{verbatim}
-\directlua{tex.enableprimitives("luatex",
- tex.extraprimitives(
- "omega", "aleph", "luatex"))}
-\end{verbatim}
-to your document.
-
-Note the compatibility layer offered by the \package{luatexbase} package
-described below makes several commands available under both names.
-
-As always, this change can be reverted using:\\
-\verb|\RequirePackage[2015/01/01]{latexrelease}|\\
-at the start of the document.
-
-
-
-\subsection{\TeX\ commands for allocation in \hologo{LuaTeX}}
-For detailed descriptions of the new allocation commands see the
-documented sources in \textsf{ltluatex.dtx} or chapter N of
-\textsf{source2e}; however, the following new allocation commands are
-defined by default in \hologo{LuaTeX}:
-\verb|\newattribute|,
-\verb|\newcatcodetable|,
-\verb|\newluafunction| and
-\verb|\newwhatsit|.
-In addition, the commands \verb|\setattribute| and
-\verb|\unsetattribute| are defined to set and unset Lua attributes
-(integer values similar to counters, but attached to nodes). Finally
-several catcode tables are predefined:
-\verb|\catcodetable@initex|,
-\verb|\catcodetable@string|,
-\verb|\catcodetable@latex|,
-\verb|\catcodetable@atletter|.
-
-\subsection{Predefined Lua functions}
-If used with \hologo{LuaTeX}, \LaTeX\ will initialise a Lua table,
-\textsf{luatexbase}, with functions supporting allocation and also
-the registering of Lua callback functions.
-
-\subsection{Support for older releases and plain \TeX}
-The \hologo{LuaTeX} allocation functionality made available in this
-release is also available in plain \TeX\ and older \LaTeX\ releases
-in the files \textsf{ltluatex.tex} and \textsf{ltluatex.lua} which may be
-used simply by including the \TeX\ file: \verb|\input{ltluatex}|.
-An alternative for old \LaTeX\ releases is to use:\\
-\verb|\RequirePackage[2015/10/01]{latexrelease}|\\
-which will update the kernel to the current release, including
-\hologo{LuaTeX} support.
-
-\subsection{Additional \hologo{LuaTeX} support packages}
-In addition to the base \LaTeX\ release two packages have been
-contributed to the \textsf{contrib} area on CTAN. The
-\package{ctablestack} package offers some commands to help package
-writers control the \hologo{LuaTeX} \textsf{catcodetable}
-functionality, and the \package{luatexbase} package replaces the
-previously available package of the same name, providing a compatible
-interface but implemented over the \package{ltluatex} code.
-
-\section{More Floats and Inserts}
-If \hologo{eTeX} is available, the number of registers allocated in
-the format to hold floats such as figures is increased from 18 to 52.
-
-The extended allocation system introduced in 2015/01/01 means that in
-most cases it is no longer necessary to load the \package{etex}
-package. Many classes and packages that previously loaded this package
-no longer do so. Unfortunately in some circumstances where a package
-or class previously used the \package{etex} \verb|\reserveinserts|
-command, it is possible for a document that previously worked to
-generate an error ``no room for a new insert''. In practice this error
-can always be avoided by declaring inserts earlier, before the
-registers below 256 are all allocated. However, it is better not
-to require packages to be re-ordered and in some cases the re-ordering
-is complicated due to delayed allocations in \verb|\AtBeginDocument|.
-
-In this release, a new implementation of
-\verb|\newinsert| is used which allocates inserts from the previously
-allocated float lists once the classical register allocation has run
-out. This allows an extra 52 (or in \hologo{LuaTeX}, 64~thousand)
-insert allocations which is more than enough for practical documents
-(by default, \LaTeX\ only uses two insert allocations).
-
-\section{Updated Unicode data}
-
-
-The file \textsf{unicode-letters.def} recording catcodes, upper and
-lower case mappings and other properties for Unicode characters has
-been regenerated using the data files from Unicode~8.0.0.
-
-\section{Support for Comma Accent}
-The command \verb|\textcommabelow| has been added to the format.
-This is mainly used for the Romanian letters
-\textcommabelow{S}\textcommabelow{s}\textcommabelow{T}\textcommabelow{t}.
-This was requested in latex/4414 in the \LaTeX\ bug tracker.
-
-\section{Extended \package{inputenc}}
-The \texttt{utf8} option for \package{inputenc} has been extended to support
-the letters s and t with comma accent,
-U+0218\,--\,U+021b. Similarly circumflex w and y U+0174\,--\,U+0177 are defined.
-Also U+00a0 and U+00ad are declared by default, and defined to be
-\verb|\nobreakspace| and \verb|\-| respectively.
-
-The error message given on undefined UTF-8 input characters
-now displays the Unicode number
-in U+\textit{hex} format in addition
-to showing the character.
-
-\section{Pre-release Releases}
-The patch level mechanism has been used previously to identify \LaTeX\
-releases that have small patches applied to the main release, without
-changing the main format date.
-
-The mechanism has now been extended to allow identification of
-pre-release versions of the software (which may or may not be released
-via CTAN) but can be identified with a banner such as\\
-{\catcode`\<=13 \def<{\string<} \catcode`\>=13 \def>{\string>}%
-\verb|LaTeX2e <2015/10/01> pre-release-1|}\\
-Internally this is identified as a patch release with a negative patch
-level.
-
-\section{Updates in tools}
-
-The \package{multicol} package has been updated to fix the interaction
-with ``here'' floats that land on the same page as the start or end of
-a \textsf{multicols} environment.
-
-\end{document}