% \iffalse
%<*internal>
\iffalse
%</internal>
%<*readme>
________________________
THE XLTXTRA PACKAGE v0.5

This package provides a number of small features
that are useful for XeLaTeX.

It loads the fixltx2e and etex packages and
patches a couple of other LaTeX commands: 
  \-: for discretionary hyphenation with variable
     hyphenation characters, and 
  \textsuperscript & \textsubscript:
     now use fontspec to access
     real superior/inferior characters,
  \emph: uses NFSS information to determine
     when to enter \eminnershape,
  \showhyphens: now works,
  \verb*: now displays visible spaces correctly
  \begin{verbatim*}: ditto

The following packages are patched (if necessary)
to correctly display visible space within various
verbatims: verbatim, moreverb, fancyvrb, listings

Defines logos \XeTeX and \XeLaTeX via 
Andrew Moschou's metalogo package.

Defines the dubiously useful commands
 \vfrac - for vulgar fractions with fontspec
 \namedglyph - to access font glyphs by name
 
For more information see the documentation xltxtra.pdf.

______________
Will Robertson
2006-2009
Released under the LaTeX Project Public License
%</readme>
%<*internal>
\fi
%</internal>
%
%<*internal>
\begingroup
%</internal>
%<*batchfile>
\input docstrip.tex
\keepsilent
\preamble
  ____________________________
  The XLTXTRA package         
  (C) 2006-2009 Will Robertson
  License information appended

\endpreamble
\postamble

Copyright (C) 2006-2009 by Will Robertson <wspr81@gmail.com>

Distributable under the LaTeX Project Public License,
version 1.3c or higher (your choice). The latest version of
this license is at: http://www.latex-project.org/lppl.txt

This work is "maintained" (as per LPPL maintenance status) 
by Will Robertson.

This work consists of the file  xltxtra.dtx
          and the derived files xltxtra.sty,
                                xltxtra.ins, and
                                xltxtra.pdf.

\endpostamble
\askforoverwritefalse
\generate{\file{\jobname.sty}{\from{\jobname.dtx}{package}}}
%</batchfile>
%<batchfile>\endbatchfile
%<*internal>
\generate{\file{\jobname.ins}{\from{\jobname.dtx}{batchfile}}}
\nopreamble\nopostamble
\generate{\file{README.txt}{\from{\jobname.dtx}{readme}}}
\generate{\file{dtx-style.sty}{\from{\jobname.dtx}{dtx-style}}}
\endgroup
\immediate\write18{makeindex -s gind.ist -o \jobname.ind  \jobname.idx}
\immediate\write18{makeindex -s gglo.ist -o \jobname.gls  \jobname.glo}
%</internal>
%
%<*driver>
\documentclass{ltxdoc}
\EnableCrossrefs
\CodelineIndex
\RecordChanges
%\OnlyDescription
\usepackage{dtx-style}
\begin{document}
  \DocInput{\jobname.dtx}
\end{document}
%</driver>
%
% \fi
%
% \errorcontextlines=999
% \makeatletter
%
% \GetFileInfo{\jobname.sty}
%
% \title{The \pkg{\jobname} package}
% \author{Will Robertson}
% \date{\filedate \qquad \fileversion}
%
% \maketitle
%
% \tableofcontents
%
% \section{Introduction}
%
% This document describes the \pkg{xltxtra} package. 
% It implements some odds-and-ends features and
% improved functionality for broken or sub-standard \LaTeX\ methods when using the
% \XeTeX\ format.
%
% \subsection{Usage}
% Easy: |\usepackage{xltxtra}|. This package automatically loads the following packages: \pkg{fixltx2e}, \pkg{etex}, \pkg{xunicode}, \pkg{fontspec}.
%
% There are some package options to disable various functionality that could clash with other things:
% \begin{description}[font=\ttfamily]
% \item[no-sscript] Swaps the definitions of \cmd\textsubscript\ and \cmd\textsuperscript\ with their respective starred versions, as described in \secref{sscript}.
% \item[no-emph] Disables the redefinition of \cmd\emph\ and \cmd\em\ described in \secref{emph}.
% \item[no-logos] Disables the redefinition of \cmd\TeX, etc. described in \secref{logos}, but \emph{does} still define the \cmd\XeTeX\ and \cmd\XeLaTeX\ logo commands.
% \item[no-hyphen] Disables the redefinition of \cmd\-\ (probably harmless anyway) described in \secref{hyphen}.
% \item[no-verb] Disables the redefinition of \cmd{\verb*} and |\begin{verbatim*}|, and the patching of various verbatim packages, as described in \secref{verb}.
% \end{description}
%
% \section{Features}
%
% \subsection{\cmd\textsuperscript\ and \cmd\textsubscript}
% \seclabel{sscript}
%
% These two macros have been redefined to take advantage, if possible, of actual superior or inferior glyphs in the main document font. This is very important for high-quality typesetting — compare this first example to the third; yes, they are the same font.
% \begin{quotation}\color{niceblue}
%	\fontspec{Skia}
%	  |\textsuperscript     | \textsuperscript{abcdefghijklmnopqrstuvwxyz1234567890}\par
%	  |\textsubscript       | \textsubscript{abcdefghijklmnopqrstuvwxyz1234567890}
% \end{quotation}
% But will fall back on `faked' ones if they don't exist: 
% (this is {\fontspec{Didot} Didot})
% \begin{quotation}\color{niceblue}
%	\fontspec{Didot}
%	  |\textsuperscript     | \textsuperscript{abcdefghijklmnopqrstuvwxyz1234567890}\par
%	  |\textsubscript       | \textsubscript{abcdefghijklmnopqrstuvwxyz1234567890}
% \end{quotation}
% The original definitions are available in starred verions of the commands:
% \begin{quotation}\color{niceblue}
%	\fontspec{Skia}
%	  |\textsuperscript*    | \textsuperscript*{abcdefghijklmnopqrstuvwxyz1234567890}\par
%	  |\textsubscript*      | \textsubscript*{abcdefghijklmnopqrstuvwxyz1234567890}
% \end{quotation}
% But beware fonts lacking the full repertoire: (this is Adobe Jenson Pro)
% \begin{quotation}\color{niceblue}
%	\fontspec{Adobe Jenson Pro}
%	  |\textsuperscript     | \makebox[0pt][l]{\textsuperscript{abcdefghijklmnopqrstuvwxyz1234567890}}\par
%	  |\textsubscript       | \makebox[0pt][l]{\textsubscript{abcdefghijklmnopqrstuvwxyz1234567890}}
% \end{quotation}
%
% The \pkgopt{no-sscript} will swap the definitions of the starred and non-starred versions of the commands described above if the new definitions are undesirable.
%
% The macros
% \cmd\realsubscript, 
% \cmd\realsuperscript, 
% \cmd\fakesubscript, and 
% \cmd\fakesuperscript\
% may be used to access the `new' and `old' functionalities regardless of the \pkgopt{no-sscript}.
%
% \subsection{Inner emphasis}
% \seclabel{emph}
%
% \pkg{fixltx2e}'s method for checking for ``inner'' emphasis is a little fragile in \XeTeX, because
% font slant information might be missing from the font. Therefore, we use \LaTeX's \acro{NFSS}
% information, which is more likely to be correct.
%
% \begin{example}
%   \renewcommand\eminnershape{\scshape}
%   \fontspec{Didot}
%   Nested {\em emphasis is 
%               \emph{now} fixed.}
% \end{example}
%
% The \pkgopt{no-emph} will disable this redefinition.
%
% \subsection{Unicode footnote symbols}
% By default \LaTeX\ defines symbolic footnote characters in terms of commands 
% that don't resolve well; better results can be achieved by using specific unicode characters or proper LICRs with the \pkg{xunicode} package.
%
% This problem has been solved by loading the 
% \pkg{fixltx2e} and \pkg{xunicode} packages in \pkg{xltxtra}.
%
% \subsection{Verbatim}
% \seclabel{verb}
%
% Many verbatim mechanisms assume the existence of a `visible space' character that exists in the \textsc{ascii} space slot of the typewriter font. This character is known in unicode as \unichar{2434}{box open}, which looks like this: `\verb*| |'.
%
% When a unicode typewriter font is used, \LaTeX\ no longer prints visible spaces for the |verbatim*| environment and |\verb*| command. \pkg{xltxtra} fixes this problem by using the correct unicode glyph, and patches the following packages to do the same:
%  \pkg{listings}, \pkg{fancyvrb}, \pkg{moreverb}, and \pkg{verbatim}.
%
% In the case that the typewriter font does not contain `\verb*| |', the Latin Modern Mono font is used as a fallback. 
%
%
%
% \subsection{Logos}
% \seclabel{logos}
%
% This part of the package essentially exists to define the \cmd\XeTeX\ and \cmd\XeLaTeX\ logos,
% which need to be tuned according to the font that is used.
% Andrew Moschou’s |metalogo| package is used to achieve this. Here are some examples. The default:
% \begingroup
% \setlogokern{Xe}{default}
% \setlogokern{eL}{default}
% \setlogokern{La}{default}
% \setlogokern{aT}{default}
% \setlogokern{Te}{default}
% \setlogokern{eX}{default}
% \setlogokern{eT}{default}
% \setlogokern{X2}{default}
% \setlogodrop{default}
% \setLaTeXa{default}
% \setLaTeXee{default}
% \begin{example}
%   \TeX\ \XeTeX\ \LaTeX\ \XeLaTeX
% \end{example}
% \noindent Notice it's a bit tight compared to not using Computer Modern, for which the logos were designed:
% \begin{example}
%   \usefont{OT1}{cmr}{m}{n}
%   \TeX\ \XeTeX\ \LaTeX\ \XeLaTeX
% \end{example}
% \endgroup
%
% Look in the implementation corresponding to this section to see how to customise the spacings in these logos and refer to the documentation for |metalogo| for more information.
%
% The \pkgopt{no-logos} will not redefine \cmd\TeX\ or \cmd\LaTeX\ but will still define \cmd\XeTeX\ and \cmd\XeLaTeX.
%
% If the \pkg{hyperref} package is loaded, these logos will be set up to behave properly in PDF bookmarks and so on.
% 
% \subsection{Discrectionary hyphenation: \cmd\-}
% \seclabel{hyphen}
%
% \LaTeX\ defines the macro \cmd\-\ to insert discretionary hyphenation points.
% However, it is hard-coded in \LaTeX\ to use the hyphen |-| character. Since \pkg{fontspec}
% makes it easy to change the hyphenation character on a per font basis, it would
% be nice if \cmd\-\ adjusted automatically — and now it does.
%
% \subsection{Vulgar fractions}
% The \cmd\vfrac\ command for setting `vulgar' fractions based on AAT or OpenType font features. Not really recommended for many purposes, depending on your text, but it's a good example of how to program such things using \pkg{fontspec}.
% \begin{example}
%   \fontspec{Skia}
%   AAT: \vfrac{123}{456}\\
%   \fontspec{Warnock Pro}
%   ICU: \vfrac{123}{456}
% \end{example}
% \noindent (This can also be achieved in regular \LaTeX\ with either the \pkg{nicefrac} or \pkg{xfrac} package.)
%
% Only use it when you know it will work; no warnings are given if the font doesn't support the necessary features.
%
% \subsection{Named glyphs}
% Along the way somewhere, \XeTeX\ added support for selecting glyphs from a TrueType-based OpenType font based on their internal glyph name. Jonathan Kew posted the following definition as a nice interface to it.
% \begin{example}
%   \fontspec{Charis SIL}
%   \namedglyph{yen}
%   \namedglyph{smile}
% \end{example}
%
% \subsection{The \cmd\showhyphens\ command}
% The default definition doesn't work in \XeTeX. 
% A new version, written by Jonathan Kew, is included in this package that \emph{does} work. Minor differences with the original: the showing of hyphens in the console output will be marked with explanatory text. Also, multiple words, separated by commas, will end up in separate instances of `showing hyphens'.
% \showhyphens{discomedusoid, discommodiousness}
%
% \newpage
% \part{The \textsf{xltxtra} package}
%\iffalse
%<*package>
%\fi
% This is the package implementation.
%
%    \begin{macrocode}
\ProvidesPackage{xltxtra}
  [2009/09/02 v0.5 Improvements for the "XeLaTeX" format]  
%    \end{macrocode}
%
% \changes{v0.3}{2007/05/29}{Added proper documentation.}
% \changes{v0.3}{2007/05/29}{Added \texttt{no-} package options to restrict functionality.}
% \changes{v0.4}{2008/07/29}{Added support for verbatim \& visible spaces.}
% ^^A\PrintChanges
%
% \paragraph{Option processing}
%    \begin{macrocode}
\newif\if@xxt@nosscript@
\newif\if@xxt@nologos@
\newif\if@xxt@nohyphen@
\newif\if@xxt@noemph@
\newif\if@xxt@noverb@
\DeclareOption{no-sscript}{\@xxt@nosscript@true}
\DeclareOption{no-logos}{\@xxt@nologos@true}
\DeclareOption{no-hyphen}{\@xxt@nohyphen@true}
\DeclareOption{no-emph}{\@xxt@noemph@true}
\DeclareOption{no-verb}{\@xxt@noverb@true}
\ProcessOptions*
%    \end{macrocode}
%
% \paragraph{Required packages}
%    \begin{macrocode}
\RequirePackage{ifxetex}
\RequireXeTeX
\RequirePackage{fontspec}
\RequirePackage{xunicode}
%    \end{macrocode}
%
% \section{Programmming bits and pieces}
%
% \section{Logos}
% \DescribeMacro{\XeTeX}
% \DescribeMacro{\XeLaTeX}
% The \TeX-related logos people insist upon using need to be tuned
% on a per-font  basis. This package calls upon Andrew Moschou's package
% |metalogo| for this purpose. To tune the logos to each font,
% use the commands \cmd\setlogokern, \cmd\setlogodrop, etc.\ Refer to
% |mathspec|’s documentation for further details.
%
% \begin{example}
%   \setlogokern{Xe}{-0.061em}
%   \setlogokern{eL}{-0.057em}
%   \setlogokern{La}{-0.265em}
%   \setlogokern{aT}{-0.0585em}
%   \setlogokern{Te}{-0.0575em}
%   \setlogokern{eX}{-0.072em}
%   \setlogokern{eT}{-0.056em}
%   \setlogokern{X2}{0.1667em}
%   \setlogodrop{0.153em}
%   \setLaTeXa{\scshape a}
%   \setLaTeXee{\mbox{\fontspec{Times}\itshape ε}}
%   \TeX\ \XeTeX\ \LaTeX\ \XeLaTeX\ \LaTeXe
% \end{example}
%
%    \begin{macrocode}
\RequirePackage{metalogo}
\setlogokern{Te}{-0.15em}
\setlogokern{eX}{-0.15em}
\setlogokern{La}{-0.36em}
\setlogokern{aT}{-0.15em}
\setlogokern{Xe}{-0.15em}
\setlogokern{eT}{-0.15em}
\setlogokern{eL}{-0.1em}
\setlogokern{X2}{default}
\setlogodrop{.5ex}
\setLaTeXa{\scshape a}
%    \end{macrocode}
%
% The \pkgopt{no-logos} might be in effect, in which case \cmd\TeX, \cmd\LaTeX\ and
% \cmd\LaTeXe\ should keep their original definitions (which were saved by |metalogo|).
%
%    \begin{macrocode}
\if@xxt@nologos@
  \let\TeX\original@TeX
  \let\LaTeX\original@TeX
  \let\LaTeXe\original@LaTeXe
\fi
%    \end{macrocode}
% 
% \begin{macro}{\TeX@logo@spacing}
% This macro is now deprecated. It is recommended to use the commands
% from |metalogo|.
%
%    \begin{macrocode}
\newcommand*\TeX@logo@spacing[6]{%
  \PackageWarning{xltxtra}{%
    Use of \protect\TeX@logo@spacing\space is deprecated,\MessageBreak
    recommend to use commands from package `metalogo' instead}
  \setlogokern{Te}{#1}%
  \setlogokern{eT}{#1}%
  \setlogokern{eX}{#2}%
  \setlogokern{Xe}{#2}%
  \setlogodrop{#3}%
  \setlogokern{La}{#4}%
  \setlogokern{aT}{#5}%  
  \setlogokern{eL}{#6}}
%    \end{macrocode}
% \changes{v0.1}{2006/05/03}{Implemented.}
% \changes{v0.2}{2006/06/11}{Added \cmd\XeLaTeX\ logo. Thanks Herb!}
% \changes{v0.2}{2006/06/11}{Added TFM font check.}
% \changes{v0.2}{2006/08/12}{\cmd\TeX@logo@spacing made ``private'' and added an arg for \cmd\XeLaTeX.}
% \changes{v0.3a}{2007/06/20}{Changed \cmd\setlength\ to \cmd\def. Silly me.}
% \changes{v0.5}{2009/09/02}{Deprecated \cmd\TeX@logo@spacing, replaced with \textsf{metalogo} package (AGM).}
% \end{macro}
%
% \textsf{hyperref}-safe versions of the logos:
%    \begin{macrocode}
\AtBeginDocument{%
  \@ifpackageloaded{hyperref}{%
    \pdfstringdefDisableCommands{%
      \def\TeX{TeX}%
      \def\XeTeX{XeTeX}%
      \def\LaTeX{LaTeX}%
      \def\LaTeXe{LaTeX2e}%
      \def\XeLaTeX{XeLaTeX}%
    }%
  }{}%
}
%    \end{macrocode}
% \changes{v0.3b}{2007/09/01}{Added hyperref logos. Thanks Ross.}
% \changes{v0.5}{2009/02/10}{hyperref logos made AtBeginDocument.}
%
% \section{\eTeX\ functionality}
% Because it's just sensible, we load the package that actually
% allows \LaTeX\ to access the extra registers, etc., provided
% by \eTeX.
%    \begin{macrocode}
\RequirePackage{etex}
%    \end{macrocode}
%
% \subsection{Unicode footnote symbols}
%    \begin{macrocode}
\RequirePackage{fixltx2e}[2006/03/24]
%    \end{macrocode}
%
% \subsection{Emph}
%    \begin{macrocode}
\unless\if@xxt@noemph@
%    \end{macrocode}
% \begin{macro}{\em}
% \begin{macro}{\emph}
% Redefinition of |{\em ...}| and |\emph{...}| to use \textsc{nfss} info to detect when the inner shape should be used.
%    \begin{macrocode}
\DeclareRobustCommand\em 
  {\@nomath\em 
   \edef\@tempa{\f@shape}%
   \edef\@tempb{\itdefault}%
   \ifx\@tempa\@tempb 
     \eminnershape 
   \else 
     \emshape 
   \fi}
\DeclareTextFontCommand{\emph}{\em}
\let\emshape\itshape
\let\eminnershape\upshape
%    \end{macrocode}
% \changes{v0.2}{2006/08/12}{Migrated from \textsf{fontspec}.}
% \end{macro} \end{macro}
%    \begin{macrocode}
\fi
%    \end{macrocode}
%
%
%
% \subsection{\cmd\-}
%    \begin{macrocode}
\unless\if@xxt@nohyphen@
%    \end{macrocode}
%
% \begin{macro}{\-}
% This macro is courtesy of Frank Mittelbach and the \LaTeXe\ source code.
%    \begin{macrocode}
\DeclareRobustCommand{\-}{%
  \discretionary{%
    \char\ifnum\hyphenchar\font<\z@
           \xlx@defaulthyphenchar
         \else
           \hyphenchar\font
         \fi}{}{}}
\def\xlx@defaulthyphenchar{`\-}
%    \end{macrocode}
% \changes{v0.1}{2006/05/03}{Implemented; from the \LaTeXe\ sources.}
% \end{macro}
%    \begin{macrocode}
\fi
%    \end{macrocode}
%
% \subsection{Subscript and superscript}
%
% For OpenType fonts, the subscript feature (|subs|) is used, but if that doesn't
% exist then the scientific inferior feature (|sinf|) is used on the assumption
% that something's better than nothing. This matches current trends in OpenType font design.
%
% Footnotes are patched to use this better \cmd\textsuperscript.
%
% \begin{macro}{\fakesubscript}
% \begin{macro}{\fakesuperscript}
% The old (`fake') methods:
%    \begin{macrocode}
\DeclareRobustCommand*\fakesubscript[1]{%
  \@textsubscript{\selectfont#1}}
\DeclareRobustCommand*\fakesuperscript[1]{% 
  \@textsuperscript{\selectfont#1}}
%    \end{macrocode}
% \changes{v0.1}{2006/05/03}{Implemented.}
% \changes{v0.3}{2007/05/29}{Name change from \cmd\fakesubscript. Made robust.}
% \end{macro}
% \end{macro}
%
% \begin{macro}{\textsubscript}
% \begin{macro}{\textsubscript*}
% \begin{macro}{\textsuperscript}
% \begin{macro}{\textsuperscript*}
% These commands are either defined to create fake or real sub-/super-scripts if they are starred or not, respectively. This swaps if the \pkgopt{no-sscript} is in effect.
% Text subscripts:
%    \begin{macrocode}
\if@xxt@nosscript@
  \DeclareRobustCommand*\textsubscript{%
    \@ifstar{\realsubscript}{\fakesubscript}}
  \DeclareRobustCommand*\textsuperscript{%
    \@ifstar{\realsuperscript}{\fakesuperscript}}
\else
  \DeclareRobustCommand*\textsubscript{%
    \@ifstar{\fakesubscript}{\realsubscript}}
  \DeclareRobustCommand*\textsuperscript{%
    \@ifstar{\fakesuperscript}{\realsuperscript}}
\fi
%    \end{macrocode}
% \changes{v0.1}{2006/05/03}{Implemented.}
% \end{macro}\end{macro}\end{macro}
% \changes{v0.3}{2007/05/29}{Adjusted, made robust (with friends `super' and starred).}
% \end{macro}
%
% \begin{macro}{\realsubscript}
%    \begin{macrocode}
\DeclareRobustCommand*\realsubscript[1]{%
  \begingroup
    \ifcsname zf@family@fontdef\f@family\endcsname
      \c@zf@script 1818326126\relax
      \font\zf@basefont="\csname zf@family@fontdef\f@family\endcsname" at \f@size pt
      \zf@set@font@type
      \ifzf@icu
        \zf@check@ot@feat{+subs}%
        \if@tempswa
          {\addfontfeature{VerticalPosition=Inferior}#1}%
        \else
          \zf@check@ot@feat{+sinf}%
          \if@tempswa
            {\addfontfeature{VerticalPosition=ScientificInferior}#1}%
          \else
            \fakesubscript{#1}%
          \fi
        \fi
      \else\ifzf@atsui
        \zf@make@aat@feature@string{10}{2}%
        \unless\ifx\@tempa\@empty
          {\addfontfeature{VerticalPosition=Inferior}#1}%
        \else
          \fakesubscript{#1}%
        \fi
      \fi\fi
    \else
      \fakesubscript{#1}%
    \fi
  \endgroup}
%    \end{macrocode}
% \changes{v0.1}{2006/05/03}{Implemented.}
% \changes{v0.3}{2007/05/29}{Fixes to catch up with fontspec. Name change.}
% \changes{v0.3c}{2008/03/02}{Fixed crash when used with a TFM font.}
% \end{macro}
%
% \begin{macro}{\realsuperscript}
% Text superscripts:
%    \begin{macrocode}
\DeclareRobustCommand*\realsuperscript[1]{%
  \begingroup
    \ifcsname zf@family@fontdef\f@family\endcsname
      \c@zf@script 1818326126\relax
      \font\zf@basefont="\csname zf@family@fontdef\f@family\endcsname" at \f@size pt
      \zf@set@font@type
      \ifzf@icu
        \zf@check@ot@feat{+sups}%
        \if@tempswa
          {\addfontfeature{VerticalPosition=Superior}#1}%
        \else
          \fakesuperscript{#1}%
        \fi
      \else\ifzf@atsui
        \zf@make@aat@feature@string{10}{1}%
        \unless\ifx\@tempa\@empty
          {\addfontfeature{VerticalPosition=Superior}#1}%
        \else
         \fakesuperscript{#1}%
        \fi
      \fi\fi
    \else
      \fakesuperscript{#1}%
    \fi
  \endgroup}
%    \end{macrocode}
% \changes{v0.1}{2006/05/03}{Implemented.}
% \changes{v0.3}{2007/05/29}{Fixes to catch up with fontspec. Name change.}
% \changes{v0.3c}{2008/03/02}{Fixed crash when used with a TFM font.}
% \end{macro}
%
% Patching footnotes:
% \begin{macro}{\@makefnmark}
%    \begin{macrocode}
\def\@makefnmark{\mbox{\normalfont\textsuperscript{\@thefnmark}}}
%    \end{macrocode}
% \changes{v0.2}{2007/02/04}{Footnotes patched to use new \cmd\textsuperscript.}
% \changes{v0.3}{2007/05/29}{Footnote symbol put in an mbox.}
% \end{macro}
%
% \begin{macro}{\vfrac}
% \darg{Numerator}
% \darg{Denominator}
% No error checking is done to ensure that the font actually has the neceessary features.
% Requires the \pkg{xunicode} package for \cmd\textfractionsolidus.
%    \begin{macrocode}
\newcommand*\vfrac[2]{%
  \begingroup
    \c@zf@script 1818326126\relax
    \font\zf@basefont="\csname zf@family@fontdef\f@family\endcsname" at \f@size pt
    \zf@set@font@type
    \ifzf@icu
      {\addfontfeature{VerticalPosition=Numerator}#1}%
       \textfractionsolidus
      {\addfontfeature{VerticalPosition=Denominator}#2}%      
    \else\ifzf@atsui
      {\addfontfeature{VerticalPosition=Superior}#1}%
       \textfractionsolidus
      {\addfontfeature{VerticalPosition=Inferior}#2}%
    \fi\fi
  \endgroup}
%    \end{macrocode}
% \changes{v0.1}{2006/05/03}{Implemented.}
% \end{macro}
%
% \begin{macro}{\namedglyph}
% \darg{Name of the font glyph to be typeset}
%    \begin{macrocode}
\newcommand\namedglyph[1]{%
  \@tempcnta=\XeTeXglyphindex "#1"\relax
  \ifnum\@tempcnta>0 
    \XeTeXglyph\@tempcnta 
  \else 
    \xxt@namedglyph@fallback{#1}%
  \fi}
%    \end{macrocode}
% \changes{v0.2}{2006/08/12}{Implemented.}
% \end{macro}
% \begin{macro}{\xxt@namedglyph@fallback}
% Redefine this macro to change how glyph names that aren't found get typeset.
%    \begin{macrocode}
\newcommand\xxt@namedglyph@fallback[1]{[#1]}
%    \end{macrocode}
% \changes{v0.2}{2006/08/12}{Implemented.}
% \end{macro}
%
%
% \begin{macro}{\showhyphens}
% This macro is entirely due to Jonathan Kew. 
% I wish I knew how to write these sorts of things.
%    \begin{macrocode}
\newbox\xxt@tempbox
\def\showhyphens#1{%
  \typeout{^^J*********************** 
           \string\showhyphens: 
           ***********************}%
  \@for\@ii:=#1\do{\xxt@showhyphens{\@ii}}%
  \typeout{^^J***********************%
           ***************%
           ***********************^^J}}
\def\xxt@showhyphens#1{%
   \setbox\@tempboxa=\vbox{%
     \hsize1sp \hbadness10000 \hfuzz\maxdimen
     \everypar={} \leftskip\z@ \rightskip\leftskip 
     \pretolerance\m@ne \noindent \hskip\z@ #1\par
     \global\setbox\xxt@tempbox=\hbox{}\xxt@sh@cat}%
   \setbox\@tempboxa=\hbox to \maxdimen{\unhbox\xxt@tempbox}}
\def\xxt@sh@cat{\unskip\unpenalty
   \setbox\@tempboxa=\lastbox 
   \unless\ifvoid\@tempboxa 
     \global\setbox\xxt@tempbox=\hbox{%
       \unhbox\@tempboxa
       \unskip\unskip
       \unhbox\xxt@tempbox}%
     \expandafter\xxt@sh@cat
   \fi}
%    \end{macrocode}
% \changes{v0.3}{2007/05/30}{Implemented.}
% \end{macro}
%
% \subsection{Verbatims}
%
% Many thanks to Apostolos Syropoulos for discovering this problem and writing the  redefinion of \LaTeX's |verbatim| environment and \cs{verb*} command.
% 
%    \begin{macrocode}
\unless\if@xxt@noverb@
%    \end{macrocode}
%
% \begin{macro}{\xxt@visiblespace}
% Print \unichar{2434}{Open box}, which is used to visibly display a space character.
%    \begin{macrocode}
\def\xxt@visiblespace{%
  \iffontchar\font"2423
    \expandafter\textvisiblespace
  \else
    \expandafter\xxt@visiblespace@fallback
  \fi}
%    \end{macrocode}
% \end{macro}
% 
% \begin{macro}{\xxt@visiblespace@fallback}
% If the current font doesn't have u2434, use Latin Modern Mono instead.
%    \begin{macrocode}
\def\xxt@visiblespace@fallback{{%
  \usefont{EU1}{lmtt}{\f@series}{\f@shape}%
  \textvisiblespace}}
%    \end{macrocode}
% \end{macro}
%
% \begin{macro}{\xxt@vprintspaces}
% Helper macro to turn spaces active and print visible space instead.
%    \begin{macrocode}
\begingroup
  \catcode`\ =\active%
  \gdef\xxt@vprintspaces{\catcode`\ \active\let \xxt@visiblespace}%
\endgroup
%    \end{macrocode}
% \end{macro}
% 
% \begin{macro}{\verb}
% \begin{macro}{\verb*}
% Redefine \cmd\verb\ to use \cmd\xxt@vprintspaces.
%    \begin{macrocode}
\def\verb{\relax\ifmmode\hbox\else\leavevmode\null\fi
  \bgroup
    \verb@eol@error \let\do\@makeother \dospecials
    \verbatim@font\@noligs
    \@ifstar\@@sverb\@verb}
\def\@@sverb{\xxt@vprintspaces\@sverb}
%    \end{macrocode}
% \end{macro}
% \end{macro}
% 
% It's better to put small things into \cmd\AtBeginDocument, so here we go:
%    \begin{macrocode}
\AtBeginDocument{%
  \xxt@patch@verbatim
  \xxt@patch@moreverb
  \xxt@patch@fancyvrb
  \xxt@patch@listings}
%    \end{macrocode}
%
% \begin{environment}{verbatim*}
% With the \pkg{verbatim} package.
%    \begin{macrocode}
\def\xxt@patch@verbatim{%
  \@ifpackageloaded{verbatim}{%
    \@namedef{verbatim*}{\begingroup\@verbatim\xxt@vprintspaces\verbatim@start}%
  }{%
%    \end{macrocode}
% This is for vanilla LaTeX.
%    \begin{macrocode}
    \@namedef{verbatim*}{\@verbatim\xxt@vprintspaces\@sxverbatim}%
  }}
%    \end{macrocode}
% \end{environment}
% 
% \begin{environment}{listingcont*}
% This is for \pkg{moreverb}. 
% The main |listing*| environment inherits this definition.
%    \begin{macrocode}
\def\xxt@patch@moreverb{%
  \@ifpackageloaded{moreverb}{%
    \@namedef{listingcont*}{%
      \def\verbatim@processline{%
        \thelisting@line \global\advance\listing@line1
        \the\verbatim@line\par}%
      \@verbatim\xxt@vprintspaces\verbatim@start}%
  }{}}
%    \end{macrocode}
% \end{environment}
% 
% \pkg{listings} and \pkg{fancvrb} make things nice and easy:
%    \begin{macrocode}
\def\xxt@patch@fancyvrb{%
  \@ifpackageloaded{fancyvrb}{%
    \let\FancyVerbSpace\xxt@visiblespace
  }{}}
%    \end{macrocode}
% 
%    \begin{macrocode}
\def\xxt@patch@listings{%
  \@ifpackageloaded{listings}{%
    \let\lst@visiblespace\xxt@visiblespace
  }{}}
%    \end{macrocode}
% Finish verbatim features:
%    \begin{macrocode}
\fi
%    \end{macrocode}
%
%\iffalse
%</package>
%\fi
%
% \clearpage
% \PrintIndex
%
% \Finale
%
%\iffalse
%<*dtx-style>
%    \begin{macrocode}
\ProvidesPackage{dtx-style}

\def\@dotsep{1000}
\setcounter{tocdepth}{2}

\setcounter{IndexColumns}{2}
\renewenvironment{theglossary}
  {\small\list{}{}
     \item\relax
     \glossary@prologue\GlossaryParms 
     \let\item\@idxitem \ignorespaces 
     \def\pfill{\hspace*{\fill}}}
  {\endlist}

\usepackage{array,booktabs,calc,color,enumitem,fancyvrb,graphicx,ifthen,longtable,refstyle,varioref,xltxtra}
\usepackage[rm]{titlesec}
\setmainfont[Mapping=tex-text]{TeX Gyre Pagella}
\setsansfont[Scale=MatchLowercase,Mapping=tex-text]{Verdana}
\setmonofont[Scale=MatchLowercase]{Consolas}

\linespread{1.05}      % A bit more space between lines
\frenchspacing         % Remove ugly extra space after punctuation

\setlogokern{Xe}{-0.061em}
\setlogokern{eL}{-0.057em}
\setlogokern{La}{-0.28em}
\setlogokern{aT}{-0.10em}
\setlogokern{Te}{-0.0575em}
\setlogokern{eX}{-0.072em}
\setlogokern{eT}{-0.056em}
\setlogokern{X2}{0.1667em}
\setlogodrop{0.153em}
\setLaTeXa{\scshape a}
\setLaTeXee{\mbox{\fontspec{Times}\itshape ε}}
\def\eTeX{{\fontspec{Times}\textit{ε}{}}-\TeX} % The eTeX logo is not (yet) covered by metalogo

\definecolor{niceblue}{rgb}{0.2,0.4,0.6}
\def\theCodelineNo{\textcolor{niceblue}{\sffamily\tiny\arabic{CodelineNo}}}

\newenvironment{example}
  {\VerbatimEnvironment
   \begin{trivlist}\item[]
   \begin{minipage}{\linewidth}
   \par\noindent\hrulefill\par
   \begin{VerbatimOut}[gobble=4]{\examplefilename}}
  {\end{VerbatimOut}\relax
   \begingroup
     \color{niceblue}
     \typesetexample
   \endgroup\par\noindent\hrulefill\par
   \end{minipage}\end{trivlist}}

\let\examplesize\normalsize
\let\auxwidth\relax

\newlength\examplewidth\newlength\verbatimwidth
\newlength\exoutdent   \newlength\exverbgap
\setlength\exverbgap{0em}
\setlength\exoutdent{-0\textwidth}
\newsavebox\verbatimbox
\edef\examplefilename{\jobname.example}

\newcommand\typesetexample{\relax
   \begin{lrbox}{\verbatimbox}\relax
     \BVerbatimInput[fontsize=\small]{\examplefilename}\relax
   \end{lrbox}
   \begin{list}{}{\setlength\itemindent{0pt}
                  \setlength\leftmargin\exoutdent
                  \setlength\rightmargin{0pt}}\item
   \ifx\auxwidth\relax
     \setlength\verbatimwidth{\wd\verbatimbox}\relax
   \else
     \setlength\verbatimwidth{\auxwidth}\relax
   \fi
   \begin{minipage}[c]{\textwidth-\exoutdent-\verbatimwidth-\exverbgap}
     \catcode`\%=14\centering\examplesize\input\examplefilename\relax
   \end{minipage}\hfill
   \begin{minipage}[c]{\verbatimwidth}
     \usebox\verbatimbox
   \end{minipage}
   \end{list}
   \global\let\examplesize\normalsize}

\newcommand*\setexsize[1]{\let\examplesize#1}
\newcommand*\setverbwidth[1]{\def\auxwidth{#1}}

\newcommand*\name[1]{{#1}}
\newcommand*\pkg[1]{\texttt{#1}}
\newcommand*\pkgopt[1]{\texttt{[#1]} package option}

\newcommand*\acro[1]{\textsc{\MakeLowercase{#1}}}

\newcommand*\note[1]{\unskip\footnote{#1}}

\let\latin\textit
\def\eg{\latin{e.g.}}
\def\Eg{\latin{E.g.}}
\def\ie{\latin{i.e.}}
\def\etc{\@ifnextchar.{\latin{etc}}{\latin{etc.}\@}}

\newcounter{argument}
\g@addto@macro\endmacro{\setcounter{argument}{0}}
\newcommand*\darg[1]{%
  \stepcounter{argument}%
  \noindent{\ttfamily\#\theargument}:~#1\par\nobreak}
\newcommand*\doarg[1]{%
  \stepcounter{argument}%
  \noindent{\ttfamily\makebox[0pt][r]{[}\#\theargument]}:~#1\par\nobreak}

\newcommand\unichar[2]{\textsc{\MakeLowercase{u+#1: #2}}}

%    \end{macrocode}
%</dtx-style>
%\fi
%
% \typeout{*************************************************************}
% \typeout{*}
% \typeout{* To finish the installation you have to move the following}
% \typeout{* file into a directory searched by XeTeX:}
% \typeout{*}
% \typeout{* \space\space\space xltxtra.sty}
% \typeout{*}
% \typeout{*************************************************************}
%
\endinput

