% \iffalse meta-comment
%
% Copyright 1993 1994 1995 1996 1997 1998 1999 2000
% 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 1.2
% 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 1.2 or later is part of all distributions of LaTeX 
% version 1999/12/01 or later.
% 
% 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.
% 
% \fi
% \iffalse
%%% From File: ltoutenc.dtx
%<package,TS1sty>\NeedsTeXFormat{LaTeX2e}
%<OT1>\ProvidesFile{ot1enc.def}
%<T1>\ProvidesFile{t1enc.def}
%<OMS>\ProvidesFile{omsenc.def}
%<OML>\ProvidesFile{omlenc.def}
%<OT4>\ProvidesFile{ot4enc.def}
%<TS1>\ProvidesFile{ts1enc.def}[1998/06/12 v3.0d (jk/car/fm)
%<package>\ProvidesPackage{fontenc}
%<TS1sty>\ProvidesPackage{textcomp}
%<OT1|T1|OMS|OML|OT4|package|TS1sty> [2000/08/30 v1.91
%<OT1|T1|OMS|OML|OT4|TS1>         Standard LaTeX file]
%<package|TS1sty>                 Standard LaTeX package]
%
%<*driver>
% \fi
\ProvidesFile{ltoutenc.dtx}
             [2000/08/30 v1.91 LaTeX Kernel (font encodings)]
% \iffalse
\documentclass{ltxdoc}
\GetFileInfo{ltoutenc.dtx}
\title{\filename}
\date{\filedate}
\author{%
  Johannes Braams\and
  David Carlisle\and
  Alan Jeffrey\and
  Frank Mittelbach\and
  Chris Rowley\and
  Rainer Sch\"opf}
\usepackage{textcomp}
\begin{document}
   \maketitle
   \DocInput{\filename}
\end{document}
%</driver>
% \fi
%
% \CheckSum{2329}
%
% \CharacterTable
%  {Upper-case    \A\B\C\D\E\F\G\H\I\J\K\L\M\N\O\P\Q\R\S\T\U\V\W\X\Y\Z
%   Lower-case    \a\b\c\d\e\f\g\h\i\j\k\l\m\n\o\p\q\r\s\t\u\v\w\x\y\z
%   Digits        \0\1\2\3\4\5\6\7\8\9
%   Exclamation   \!     Double quote  \"     Hash (number) \#
%   Dollar        \$     Percent       \%     Ampersand     \&
%   Acute accent  \'     Left paren    \(     Right paren   \)
%   Asterisk      \*     Plus          \+     Comma         \,
%   Minus         \-     Point         \.     Solidus       \/
%   Colon         \:     Semicolon     \;     Less than     \<
%   Equals        \=     Greater than  \>     Question mark \?
%   Commercial at \@     Left bracket  \[     Backslash     \\
%   Right bracket \]     Circumflex    \^     Underscore    \_
%   Grave accent  \`     Left brace    \{     Vertical bar  \|
%   Right brace   \}     Tilde         \~}
%
% 
% \changes{v1.9k}{1998/01/12}{Added \cs{ProvidesPackage}
%    for textcomp.sty}
% \changes{v1.9i}{1997/12/19}{Documentation corrections.}
% \changes{v1.9h}{1997/12/17}{Documentation changes and additions.}
% \changes{v1.9h}{1997/12/17}{Added textcomp.sty.}
% \changes{v1.9f}{1997/08/29}{Added OT4 encoding,
%    provided by Marcin Woli\'nski.}
% \changes{v1.7r}{1995/11/28}{doc fixes}
% \changes{v1.7h}{1995/04/21}{Added \cs{null} \cs{k}  latex/1274}
% \changes{v1.7f}{1994/12/14}{Added braces to \cs{copyright} so it
%    works unbraced in subscripts.} 
% \changes{v1.7f}{1994/12/14}{Added check for math mode in
%    \cs{@changed@cmd}.} 
% \changes{v1.7f}{1994/12/14}{Commented out \cs{textasciicircum},
%    \cs{textasciitilde}, \cs{textbackslash}, \cs{textbar},
%    \cs{textgreater}, \cs{texthyphenchar}, \cs{texthyphen} and
%    \cs{textless} to save memory.}
% \changes{v1.7e}{1994/12/10}{Added documentation for the OML encoding.}
% \changes{v1.7e}{1994/12/10}{Replaced width with \cs{@width} and
%    ditto height in vrules.}
% \changes{v1.7d}{1994/12/08}{Added \cs{null} and \cs{sh@ft} to \cs{b}
%    and \cs{d}.}
% \changes{v1.7c}{1994/12/05}{Added braces to \cs{textcircled}.}
% \changes{v1.7b}{1994/12/02}{Fixed a bug with \cs{a}.}
% \changes{v1.7a}{1994/11/30}{Added new code for encoding-specific
%    commands.  These now expand in the mouth, which means that
%    ligaturing and kerning can happen.}
% \changes{v1.6i}{1994/11/22}{Fixed empty accents.  Again.}
% \changes{v1.6i}{1994/11/22}{Corrected \cs{dots} so that there's no
%    kerning in monowidth fonts.}
% \changes{v1.6i}{1994/11/22}{Corrected typo with
%    \cs{mathunderscore}.} 
% \changes{v1.6h}{1994/11/17}{(DPC) \cs{@tempa} to \cs{reserved@a}}
% \changes{v1.6d}{1994/11/02}{Wrapped lines longer than 70 characters.}
% \changes{v1.6d}{1994/10/30}{Added math commands.}
% \changes{v1.6d}{1994/10/30}{Added OML encoding.}
% \changes{v1.6d}{1994/10/30}{Added \cs{textcircled}.}
% \changes{v1.6d}{1994/10/30}{Added \cs{DeclareTextCompositeCommand}.}
% \changes{v1.6c}{1994/10/29}{Renamed \cs{P}, \cs{S}, \cs{dag} and 
%    \cs{ddag} to \cs{textparagraph}, \cs{textsection},
%    \cs{textdagger} and \cs{textdaggerdbl}.}
% \changes{v1.6b}{1994/10/27}{Removed the enc.def files}
% \changes{v1.6a}{1994/10/25}{Added \cs{ProvideTextCommand},
%    \cs{UseTextSymbol},
%    \cs{UseTextAccent},
%    \cs{DeclareTextSymbolDefault},
%    \cs{DeclareTextAccentDefault},
%    \cs{DeclareTextCommandDefault}, and
%    \cs{ProvideTextCommandDefault}.}
% \changes{v1.5m}{1994/10/18}{Added new definitions of \cs{patterns}
%    and \cs{hyphenation}.}
% \changes{v1.5l}{1994/10/07}{Moved the ogonek accent.}
% \changes{v1.5k}{1994/05/18}{Removed braces from \cs{pounds} and
%    \cs{dollar}.}
% \changes{v1.5k}{1994/05/18}{Replaced \cs{defaultencoding} with
%    \cs{encodingdefault}.}
% \changes{v1.5k}{1994/05/18}{Made dotted-i produce `i'.}
% \changes{v1.5j}{1994/05/17}{Added braces to \cs{pounds} so it works
%    as a subscript.}
% \changes{v1.5i}{1994/05/16}{Fixed a bug with \cs{d}.}
% \changes{v1.5h}{1994/05/16}{Added \cs{NG}, \cs{ng}, \cs{TH},
%    \cs{th}, \cs{DH}, \cs{dh}, \cs{DJ} and \cs{dj}.}
% \changes{v1.5h}{1994/05/16}{Added \cs{r} (ring accent) and \cs{k}
%    (ogonek) accents.}
% \changes{v1.5h}{1994/05/16}{Removed \cs{P} from the OT1 definitions
%    file.}
% \changes{v1.5h}{1994/05/16}{Fixed a bug with \cs{pounds}.}
% \changes{v1.5g}{1994/05/16}{Made fontenc.sty use the new mixed-case
%    encoding files.}
% \changes{v1.5f}{1994/05/16}{Revert code so that the encoding
%                    given is used in \cs{DeclareTextCommand} (FMi)}
% \changes{v1.5f}{1994/05/16}{enc files now have uc encoding name
%                             parts (FMi)}
% \changes{v1.5e}{1994/05/14}{Replaced \cs{ENC@cmd} by \cs{ENC-cmd}.}
% \changes{v1.5d}{1994/05/14}{Rewrote \cs{DeclareTextCommand} to define
%    its argument to use the current encoding by default, rather than
%    the encoding provided to \cs{DeclareTextCommand}.}
% \changes{v1.5d}{1994/05/14}{Tidied up the documentation.}
% \changes{v1.5c}{1994/05/14}{Added the fontenc package.}
% \changes{v1.5c}{1994/05/14}{Fixed a bug which caused an infinite loop
%    if \cs{f@encoding} was incorrectly set.}
% \changes{v1.5c}{1994/05/14}{Moved fontsmpl to its own dtx file.}
% \changes{v1.5b}{1994/05/13}{Added \cmd\{, \cmd\} and \cmd\$.}
% \changes{v1.5b}{1994/05/13}
%    {Replaces \cs{space} by `~' in \cs{csname}.}
% \changes{v1.5b}{1994/05/13}{Renamed \cs{DeclareProtectedCommand} to
%    \cs{DeclareRobustCommand}.}
% \changes{v1.5a}{1994/05/11}{Renamed the commands again.  Made the
%    encoding part of the command syntax.  Added the
%    \cs{DeclareTextCommand} interface.  Used
%    \cs{DeclareProtectedCommand}.}
% \changes{v1.4a}{1994/05/01}{Renamed the commands, removed the
%    \cs{EncodingSpecific} command.  Turned all slots into decimal.
%    Added \cs{a}.}
% \changes{v1.4a}{1994/05/01}{Removed Rokicki's encoding.}
% \changes{v1.3d}{1993/12/18}{Some T1 stuff had drifted into the OT1
%    file.}
% \changes{v1.3c}{1993/12/18}{A new syntax, separating
%    accent-definitions from encoing-specific definitions, and
%    allowing encoding-specific \cs{chardef}, \cs{let}, etc.}
% \changes{v1.3c}{1993/12/18}{Rewrote for the new syntax of
%    \cs{EncodingSpecific}.}
% \changes{v1.3b}{1993/12/18}{Corrected typos.}
% \changes{v1.3b}{1993/12/18}{Replaced the missing last argument to
%    \cs{DeclareFontEncoding}.}
% \changes{v1.3a}{1993/12/18}{Replaced OT3 by XXX}
% \changes{v1.3}{1993/12/17}{Added \cs{EncodingSpecificAccent},
%   \cs{EncodingSpecificAccentedLetter} and
%   \cs{EncodingSpecificCommand}.}
% \changes{v1.3}{1993/12/17}{Made Rokicki's encoding a proper encoding
%    scheme rather than a variant of OT1.}
% \changes{v1.2b}{1993/12/13}{Corrected file name in driver code.}
% \changes{v1.2a}{1993/12/11}{Corrected for t1enc, math.}
% \changes{v1.2}{1993/12/10}{Added source code for t1enc.sty.}
% \changes{v1.1}{1993/12/07}{Made all character numbers decimal.}
% \changes{v1.1}{1993/12/07}{Removed a lot of equal signs and the 
%   like.}
%
%
% \section{Font encodings}
%
%    This section of the kernel contains commands for declaring
%    encoding-specific
%    commands, such as accents.  It also contains the code for some of
%    the encoding files, including |omlenc.def|,
%    |omsenc.def|, |t1enc.def| and |ot1enc.def| files, which define
%    the |OLM|,
%    |OMS|, |T1| and |OT1| encodings, and the |fontenc| package
%    for selecting encodings.
%
%    The |fontenc| package has options for encodings, of which the
%    last option is the default encoding.  For example, to use the
%    |OT2|, |OT3| and |T1| encodings, with |T1| as the default, you
%    say: 
%\begin{verbatim}
%    \usepackage[OT2,OT3,T1]{fontenc}
%\end{verbatim}
%    The standard kernel set-up loads font encoding files and selects
%    an encoding as follows.
%\begin{verbatim}
%    \input {omlenc.def}
%    \input  {t1enc.def}
%    \input {ot1enc.def}
%    \input {omsenc.def}
%    \fontencoding{OT1}
%\end{verbatim}
%    Note that the files in the standard |inputenc| package depend on
%    this behaviour of the kernel.
%    
%    The syntax for declaring encoding-specific commands is:
%    \begin{quote}
%      |\DeclareTextCommand{|^^A
%         \meta{command}|}{|^^A
%         \meta{encoding}|}|\\\hspace*{\fill}|[|^^A
%         \meta{number}|][|^^A
%         \meta{default}|]{|^^A
%         \meta{commands}|}|
%    \end{quote}
%    This command is like |\newcommand|, except that it defines a
%    command which is specific to one encoding.  The resulting command
%    is always robust, even if its definition is fragile.  For example,
%    the definition of |\l| in the |OT1| encoding is:
%\begin{verbatim}
%    \DeclareTextCommand{\l}{OT1}{{\@xxxii l}}
%\end{verbatim}
%    |\DeclareTextCommand| takes the same optional arguments as
%    |\newcommand|.
%    \begin{quote}
%      |\ProvideTextCommand{|^^A
%         \meta{command}|}{|^^A
%         \meta{encoding}|}|\\\hspace*{\fill}|[|^^A
%         \meta{number}|][|^^A
%         \meta{default}|]{|^^A
%         \meta{commands}|}|
%    \end{quote}
%    This acts like |\DeclareTextCommand|, but does nothing if the 
%    command is already defined.
%    \begin{quote}
%      |\DeclareTextSymbol{|^^A
%         \meta{command}|}{|^^A
%         \meta{encoding}|}{|^^A
%         \meta{slot}|}|
%    \end{quote}
%    This command defines a text symbol, with a particular slot in that
%    encoding.  The commands:
% \changes{v1.9h}{1997/12/17}{Example corrected, braces removed.}
%\begin{verbatim}
%    \DeclareTextSymbol{\ss}{OT1}{25}
%    \DeclareTextCommand{\ss}{OT1}{\char25 }
%\end{verbatim}
%    have the same effect, but the |\DeclareTextSymbol| is faster.
%    \begin{quote}
%      |\DeclareTextAccent{|^^A
%         \meta{command}|}{|^^A
%         \meta{encoding}|}{|^^A
%         \meta{slot}|}|
%    \end{quote}
% \changes{v1.8e}{1996/11/23}{Corrected description}
% \changes{v1.9k}{1997/12/31}{Further correction}
%    This command declares a text accent.  The commands:
%\begin{verbatim}
%    \DeclareTextAccent{\"}{OT1}{127}
%    \DeclareTextCommand{\"}{OT1}{\add@accent {127}}
%\end{verbatim}
%    have the same effect.
% \changes{v1.8c}{1996/10/27}
%      {Corrected syntax descriptions}
%    \begin{quote}
%      |\DeclareTextComposite{|^^A
%          \meta{command}|}|\\\hspace*{\fill}|{|^^A
%         \meta{encoding}|}{|^^A
%         \meta{argument}|}{|^^A
%             \meta{slot}|}|
%    \end{quote}
%    This command declares a composite letter, for example in the |T1|
%    encoding |\'{a}| is slot 225, which is declared by:
%\begin{verbatim}
%    \DeclareTextComposite{\'}{T1}{a}{225}
%\end{verbatim}
% \changes{v1.8e}{1996/11/23}
%      {Corrected description}
%    The \emph{command} will normally have been declared with
%    |\DeclareTextAccent|, or as a one-argument |\DeclareTextCommand|.
%
%    |\DeclareTextComposite| is the most common example of using 
%    the more general declaration
%    |\DeclareTextCompositeCommand|, which can define a composite 
%    to be an arbitrary piece of text.
%    \begin{quote}
%      |\DeclareTextCompositeCommand{|^^A
%          \meta{command}|}|\\\hspace*{\fill}|{|^^A
%         \meta{encoding}|}{|^^A
%         \meta{argument}|}{|^^A
%             \meta{text}|}|
%    \end{quote}
%    For example, in the OT1 encoding \r A has a hand-crafted
%    defintion this is declared as follows
%\begin{verbatim}
%    \DeclareTextCompositeCommand{\r}{OT1}{A}
%     {\leavevmode\setbox\z@\hbox{h}\dimen@\ht\z@\advance\dimen@-1ex%
%      \rlap{\raise.67\dimen@\hbox{\char23}}A} 
%\end{verbatim}
% \changes{v1.8e}{1996/11/23}
%      {Corrected description}
%    The \emph{command} will normally have been declared with
%    |\DeclareTextAccent|, or as a one-argument |\DeclareTextCommand|.
%
%    The commands defined using the above declarations can be used in
%    two ways.
%    Normally they are used by just calling the command in the 
%    appropriate encoding, for example |\ss|.  However, sometimes you
%    may wish to use a command in an encoding where it is not defined.
%    If the command has no arguments, then you can use it in another 
%    encoding by calling |\UseTextSymbol|:
%    \begin{quote}
%      |\UseTextSymbol{|^^A
%         \meta{encoding}|}{|^^A
%         \meta{command}|}|
%    \end{quote}
% 
% \task{Document the problems of these commands, see pr/3160}
% \changes{v1.9e}{1997/08/05}{Corrected order of arguments in
%          \cs{UseTextSymbol} example.}
%    For example, |\UseTextSymbol{OT1}{\ss}| has the same effect as: 
%\begin{verbatim}
%    {\fontencoding{OT1}\selectfont\ss}
%\end{verbatim}
%    If the command has one argument then you can use it in another
%    encoding by calling  
%    |\UseTextAccent|: 
%    \begin{quote}
%      |\UseTextAccent{|^^A
%         \meta{encoding}|}{|^^A
%         \meta{command}|}{|^^A
%         \meta{text}|}|
%    \end{quote}
%    For example, if the current encoding is |OT2| then 
%    |\UseTextAccent{OT1}{\'}{a}| has the same effect as:
%\begin{verbatim}
%    {\fontencoding{OT1}\selectfont\'{\fontencoding{OT2}\selectfont a}}
%\end{verbatim}
% \changes{v1.8e}{1996/11/23}
%      {Extended description}
%    You can also declare a default definition for a text command, which
%    will be used if the current encoding has no appropriate definition.
%    Such use will also set the definition for this command in the
%    current encoding to equal this default definition; this makes
%    subsequent uses of the command much faster.
%    \begin{quote}
%      |\DeclareTextCommandDefault{|^^A
%         \meta{command}|}{|^^A
%         \meta{definition}|}|
%    \end{quote}
%    For example, the default definition of the command
%    |\textonequarter| (which produces the fraction $\frac14$) could be
%    built using math mode: 
%\begin{verbatim}
%    \DeclareTextCommandDefault{\textonequarter}{\ensuremath {\frac14}}
%\end{verbatim}
%    There is a matching |\Provide| command which will not override an 
%    existing default definition: 
%    \begin{quote}
%      |\ProvideTextCommandDefault{|^^A
%         \meta{command}|}{|^^A
%         \meta{definition}|}|
%    \end{quote}
%    The most common use for these commands is to use symbols from
%    other encodings, so there are some optimizations provided:
%    \begin{quote}
%      |\DeclareTextSymbolDefault{|^^A
%         \meta{command}|}|^^A
%         \meta{encoding}|}|\\
%      |\DeclareTextAccentDefault{|^^A
%         \meta{command}|}|^^A
%         \meta{encoding}|}|
%    \end{quote}
%    are short for:
%    \begin{quote}
%      |\DeclareTextCommandDefault{|^^A
%         \meta{command}|}|\\\hspace*{\fill}^^A
%         |{\UseTextSymbol{|^^A
%         \meta{encoding}|}{|\meta{command}|}}| \\
%      |\DeclareTextCommandDefault[1]{|^^A
%         \meta{command}|}|\\\hspace*{\fill}^^A
%         |{\UseTextAccent{|^^A
%         \meta{encoding}|}{|\meta{command}|}{#1}}| 
%    \end{quote}
%    For example, to make |OT1| the default encoding for |\ss| and
%    |\'| you say:
%\begin{verbatim}
%    \DeclareTextSymbolDefault{\ss}{OT1}
%    \DeclareTextAccentDefault{\'}{OT1}
%\end{verbatim}
%    Note that you can use these commands on any zero- or one-argument 
%    commands declared with |\DeclareText*| or |\ProvideText*|, not
%    just those defined using |\DeclareTextSymbol| or
%    |\DeclareTextAccent|. 
%
% \subsection{Removing encoding-specific commands}
%    \label{sec:removeencspec}
%
% \changes{v1.9o}{1998/03/20}{Documentation added for pr/2783}
%
% In some cases encoding definitions are given to provide some limited
% support since nothing better is available, for example, the definition
% for |\textdollar| in \texttt{OT1} is a hack since \$ and \pounds{}
% actually share the same slot in this encoding. Thus if such a glyph
% becomes available in a different encoding (e.g., \texttt{TS1}) one
% would like to get rid of the flacky one and make the default
% definition point to the new encoding. In such a case defining
%\begin{verbatim}
%   \DeclareTextSymbol{\textdollar}{TS1}{36}
%   \DeclareTextSymbolDefault{\textdollar}{TS1}
%\end{verbatim}
% is not enough since if typesetting in \texttt{OT1} \LaTeX{} will
% still find the encoding specific-definition for \texttt{OT1} and
% therefore ignore the new default.
% Therefore to ensure that in this case the \texttt{TS1} version is
% used  we have to remove the \texttt{OT1} declaration:
%\begin{verbatim}
%   \UndeclareTextCommand{\textdollar}{OT1}
%\end{verbatim}
%
% Since the \$ sign is a proper glyph in the \texttt{T1} encoding there
% is no point removing its definition and forcing \LaTeX{} to pick up
% the \texttt{TS1} version if typesetting in this encoding.
% However, assume you want to use the variant dollar sign,
% i.e., \textdollaroldstyle{}
% for your dollars. In that case you have to get rid of the \texttt{T1}
% declaration as well, e.g., the following would do that for you:
%\begin{verbatim}
%   \UndeclareTextCommand{\textdollar}{OT1}
%   \UndeclareTextCommand{\textdollar} {T1}
%   \DeclareTextCommandDefault{\textdollar}
%                             {\UseTextSymbol{TS1}\textdollaroldstyle}
%\end{verbatim}
%
% \subsection{The order of declarations}\label{sec:orderofdecls}
%
% \changes{v1.9o}{1998/03/20}{Documentation added about order of decls}
%
% If an encoding-specific command is defined for more than one encoding,
% then it will execute fastest in the encoding in which it was defined
% last since its top-level definition will be set up to execute in that
% encoding without any overhead.
%
% For this reason the file \texttt{fonttext.ltx} currently first loads
% the definitions for the \texttt{T1} encoding and then those for the
% \texttt{OT1} encoding so that typesetting in \texttt{OT1} is optimized
% since that is (still) the default. However, when \texttt{T1} is
% explicitly requested (via |\usepackage[T1]{fontenc}|) the
% top-level definitions are automatically changed to favour
% \texttt{T1} since its declarations are reloaded in the process.
%
% For the same reason default declarations should never come last since
% they are implemented as a special encoding themselves (with the
% name |?|).
% Specifying them last would simply mean to make those encoding-specific 
% commands equally inefficient in all encodings. Therefore the
% \texttt{textcomp} package, for example, first sets up all defaults
% to point to \texttt{TS1} and then declares the commands in the
% \texttt{TS1} encoding.
% 
%
% \StopEventually{}
%
% \subsection{Docstrip modules}
%
%    This |.dtx| file is be used to generate several related files
%    containing font encoding definitions. The mutually exclusive 
%    docstrip options are listed here.
%    \begin{center}
%    \begin{tabular}{lp{10cm}}
%      |T1|       & generates |t1enc.def| for the Cork encoding. \\
%      |TS1|      & generates |ts1enc.def| for the Text Companion
%                   encoding. \\
%      |TS1sty|   & generates |textcomp.sty|, package that sets up use
%                   of the Text Companion encoding. \\
%      |OT1|      & generates |ot1enc.def| for Knuth's CM encoding. \\
%      |OMS|      & generates |omsenc.def| for Knuth's 
%                   math symbol encoding. \\
%      |OML|      & generates |omlenc.def| for Knuth's 
%                   math letters encoding. \\
%      |OT4|      & generates |ot4enc.def| for the Polish extension to
%                   the OT1 encoding, created by B.~Jackowski and
%                   M.~Ry\'cko for use with the Polish version of
%                   Computer Modern and Computer Concrete.\\
%      |package|  & generates |fontenc.sty| for 
%                   selecting encodings. \\
%      |2ekernel| & for the kernel commands.\\
%      |autoload| & for the `autoload' kernel commands.\\
%      |autoerr|  & for the autoerr.sty error message autoload file.
%    \end{tabular}
%    \end{center}
% \changes{1.0d}{1993/07/17}{changed \cs{catcoding} @}
% \changes{1.0f}{1993/08/13}{Protected against active @ sign.}
% \changes{1.0g}{1993/08/16}{Needs space after \cs{string}}
% \changes{1.1}{1993/12/07}{Protected all special characters with
%                          \cs{string}.}
% \changes{1.3}{1993/12/17}{Removed the catcode hackery, since the file
%    is only read as a package in the preamble, and removed all the
%    messages on the screen, which just confuse users.  Replaced them
%    by the appropriate \cs{ProvidesPackage} commands. Added XXXenc.}
% \changes{1.3b}{1993/12/18}
%   {Fixed typos with \cs{ProvidesPackage} lines.
%    Added the \cs{NeedsTeXFormat} line.  Added the last argument to
%    \cs{DeclareEncoding}. Moved the use of the encodings to after their
%    declaration. }
% \changes{1.4a}{1994/04/29}{Removed Rokicki's OT1 variant encoding.
%    Moved the driver to the top.}
% \changes{1.5a}{1994/05/11}{Made T1 and OT1 generate packages rather
%    than def files.  Renamed the `package' module to `teststy'.}
% \changes{1.5d}{1994/05/14}{Moved the driver to the top.}
%
% \subsection{Definitions for the kernel}
%
% \subsubsection{Declaration commands}
%
% \changes{1.3}{1993/12/17}{Added this section}
% \changes{1.3c}{1993/12/18}{Split \cs{EncodingSpecificAccent} up into
%    \cs{EncodingSpecific} and \cs{DeclareAccent}.}
% \changes{1.4a}{1994/04/29}{Removed \cs{EncodingSpecific}.  Renamed
%    all the commands.  Added \cs{DeclareTextGlyph} and
%    \cs{UndeclareTextCommand}.}
% \changes{v1.5a}{1994/05/11}{Reimplemented \cs{DeclareTextCommand}
%    using \cs{@changed@cmd} and \cs{DeclareProtectedCommand}.}
% \changes{v1.5c}{1994/05/14}{Fixed a bug which caused an infinite loop
%    if \cs{f@encoding} was incorrectly set.}
% \changes{v1.5d}{1994/05/14}{Rewrote \cs{DeclareTextCommand} to define
%    its argument to use the current encoding by default, rather than
%    the encoding provided to \cs{DeclareTextCommand}.}
% \changes{v1.6a}{1994/10/25}{Added the \cs{Provide} commands,
%    and the default definitions.}
%
% This section contains definitions for commands such as accents which
% depend on the current encoding.  These commands will usually be kept
% in |.def| files, for example |ot1enc.def| contains the definitions
% for the |OT1| encoding.
%    \begin{macrocode}
%<*2ekernel|autoload>
\message{font encodings,}
%    \end{macrocode}
%
% \changes{v1.5d}{1994/10/27}{Rewrote \cs{DeclareTextSymbol} to define
%    its argument to use the current encoding by default, to fit with 
%    \cs{DeclareTextCommand}.}
%
% \changes{v1.7a}{1994/11/30}{Redefined \cs{@changed@cmd} to expand in
%    the mouth.}
% \changes{v1.7a}{1994/11/30}{Removed \cs{@changed@x@mouth} since
%    \cs{@changed@x} now expands in the mouth.}
%
% \changes{v1.7r}{1995/11/28}{Renamed \cs{@changed@x@err} to
%    \cs{TextSymbolUnavailable}.}
% \changes{v1.7r}{1995/11/28}{Added math mode checks to text commands.}
%
% \begin{macro}{\DeclareTextCommand}
% \begin{macro}{\ProvideTextCommand}
% \begin{macro}{\DeclareTextSymbol}
% \begin{macro}{\@dec@text@cmd}
% \begin{macro}{\@changed@cmd}
% \begin{macro}{\@changed@x}
% \begin{macro}{\TextSymbolUnavailable}
% \begin{macro}{\@inmathwarn}
%    If you say:
%\begin{verbatim}
%    \DeclareTextCommand{\foo}{T1}...
%\end{verbatim}
%    then |\foo| is defined to be |\T1-cmd \foo \T1\foo|,
%    where |\T1\foo| is \emph{one} control sequence, not two!
%    We then call |\newcommand| to define |\T1\foo|.
%    \begin{macrocode}
\def\DeclareTextCommand{%
   \@dec@text@cmd\newcommand}
%    \end{macrocode}
%
%    \begin{macrocode}
\def\ProvideTextCommand{%
   \@dec@text@cmd\providecommand}
%    \end{macrocode}
%
%    \begin{macrocode}
\def\DeclareTextSymbol#1#2#3{%
   \@dec@text@cmd\chardef#1{#2}#3\relax}
%    \end{macrocode}
%
%    \begin{macrocode}
\def\@dec@text@cmd#1#2#3{%
   \expandafter\def\expandafter#2%
      \expandafter{%
         \csname#3-cmd\expandafter\endcsname
         \expandafter#2%
         \csname#3\string#2\endcsname
      }%
   \let\@ifdefinable\@rc@ifdefinable
   \expandafter#1\csname#3\string#2\endcsname}
%    \end{macrocode}
%    The declarations are only available before |\begin{document}|.
% \changes{v1.7h}{1995/05/21}{Added several \cs{@onlypreamble}}
% \changes{v1.7k}{1995/06/05}{Removed \cs{protected@cmd} and replaced
%    with explicit \cs{noexpand}.}
%    \begin{macrocode}
\@onlypreamble\DeclareTextCommand
\@onlypreamble\DeclareTextSymbol
%    \end{macrocode}
%    The sneaky bit in all this is what |\T1-cmd \foo \T1\foo| does.  
%    There are five possibilities, depending on the current values of
%    |\protect|, |\cf@encoding| and |\ifmmode|:
%    \begin{itemize}
%    \item If |\protect| is |\@typeset@protect| and |\cf@encoding| is
%       |T1|, then we execute |\T1\foo|.  This should be the normal
%       behaviour, and is optimized for speed.
%    \item If |\protect| is |\@typeset@protect|, |\cf@encoding| is
%       (say) |OT1|, and |\OT1\foo| is defined, then we execute
%       |\OT1\foo|. 
%    \item If |\protect| is |\@typeset@protect|, |\cf@encoding| is
%       (say) |OT1|, we're in text mode,
%       and |\OT1\foo| is undefined, then we define
%       |\OT1\foo| to be the default value of |\foo|, and execute
%       |\OT1\foo|. 
%    \item If |\protect| is |\@typeset@protect|, |\cf@encoding| is
%       (say) |OT1|, we're in math mode,
%       and |\OT1\foo| is undefined, then we execute the default value
%       of |\foo|.  (This is necessary so that things like
%       |$X_\copyright$| work properly.)
%    \item If |\protect| is not |\@typeset@protect| then we execute
%       |\noexpand\foo|.  For example, if we are writing to a file,
%       then this results in |\foo| being written.  If we are in a
%       |\mark|, then |\foo| will be put in the mark---since |\foo| is
%       robust, it will then survive all the things which may happen
%       to it whilst it's a |\mark|.
%    \end{itemize}
%    So after all that, we will either execute the appropriate
%    definition of |\foo| for the current encoding, or we will execute
%    |\noexpand\foo|.
%
%    The default value of |\foo| is |\?\foo| if it is defined, and an
%    error message otherwise.
%
%    When the encoding is changed from |T1| to |OT1|, |\T1-cmd| is
%    defined to be |\@changed@cmd| and |\OT1-cmd| is defined to be
%    |\@current@cmd|.  This means that the test for what the current
%    encoding is can be performed quickly.
%    \begin{macrocode}
\def\@current@cmd#1{%
   \ifx\protect\@typeset@protect
      \@inmathwarn#1%
   \else
      \noexpand#1\expandafter\@gobble
   \fi}
%    \end{macrocode}
%
%    \begin{macrocode}
\def\@changed@cmd#1#2{%
   \ifx\protect\@typeset@protect
      \@inmathwarn#1%
      \expandafter\ifx\csname\cf@encoding\string#1\endcsname\relax
         \expandafter\ifx\csname ?\string#1\endcsname\relax
            \expandafter\def\csname ?\string#1\endcsname{%
               \TextSymbolUnavailable#1%
            }%
         \fi
         \global\expandafter\let
               \csname\cf@encoding \string#1\expandafter\endcsname
               \csname ?\string#1\endcsname
      \fi
      \csname\cf@encoding\string#1%
         \expandafter\endcsname
   \else
      \noexpand#1%
   \fi}
%    \end{macrocode}
% \changes{v1.7m}{1995/10/09}{Autoload error}
% \changes{v1.7v}{1995/12/05}{Changed \cs{TextSymbolUnavailable} text}
%    \begin{macrocode}
%</2ekernel|autoload>
%<*2ekernel|autoerr>
\gdef\TextSymbolUnavailable#1{%
   \@latex@error{%
      Command \protect#1 unavailable in encoding \cf@encoding%
   }\@eha}
%</2ekernel|autoerr>
%<autoload>\gdef\TextSymbolUnavailable{\@autoerr\TextSymbolUnavailable}
%<*2ekernel|autoload>
%    \end{macrocode}
%    The command |\@inmathwarn| produces a warning message if we are
%    currently in math mode.  Note that since this command is used
%    inside text commands, it can't call |\relax| before the
%    |\ifmmode|.  This means that it is possible for the warning to
%    fail to be issued at the beginning of a row of an halign whose
%    template enters math mode.  This is probably a bad feature, but
%    there's not much that can be done about it, since adding a |\relax|
%    would break ligatures and kerning between text symbols.
%
%    A more efficient solution would be to make |\@inmathwarn| and
%    |\@inmatherr| equal to |\@empty| and |\relax| by default, and 
%    to have
%    |\everymath| reset them to their usual definitions.  This is left
%    for future investigation (for example it may break some third
%    party code).
%    \begin{macrocode}
\def\@inmathwarn#1{%
   \ifmmode 
      \@latex@warning{Command \protect#1 invalid in math mode}%
   \fi}
%    \end{macrocode}
% \end{macro}
% \end{macro}
% \end{macro}
% \end{macro}
% \end{macro}
% \end{macro}
% \end{macro}
% \end{macro}
%
% \changes{v1.7k}{1995/06/05}{Allowed \cs{ProvideTextCommandDefault}
%    after the preamble.} 
%
% \begin{macro}{\DeclareTextCommandDefault}
% \begin{macro}{\ProvideTextCommandDefault}
%    These define commands with encoding |?|.
%
%    Note that |\DeclareTextCommandDefault| can only be used in the
%    preamble, but that the |\Provide| version is allowed in inputenc
%    |.def| files, so is allowed anywhere.
%    \begin{macrocode}
\def\DeclareTextCommandDefault#1{%
   \DeclareTextCommand#1?}
%    \end{macrocode}
%
%    \begin{macrocode}
\def\ProvideTextCommandDefault#1{%
   \ProvideTextCommand#1?}
%    \end{macrocode}
%
%    \begin{macrocode}
\@onlypreamble\DeclareTextCommandDefault
%\@onlypreamble\ProvideTextCommandDefault
%    \end{macrocode}
%    They require |\?-cmd| to be initialized as |\@changed@cmd|.
%    \begin{macrocode}
\expandafter\let\csname?-cmd\endcsname\@changed@cmd
%    \end{macrocode}
% \end{macro}
% \end{macro}
%
% \begin{macro}{\DeclareTextAccent}
% \changes{v1.5a}{1994/05/11}
%      {Reimplemented using \cs{DeclareTextCommand}.}
% \changes{v1.7z}{1996/05/23}
%      {Reimplemented using \cs{add@accent} to save space latex/2133}
%    This is just a disguise for defining a \TeX~|\accent| command.
%    \begin{macrocode}
\def\DeclareTextAccent#1#2#3{%
   \DeclareTextCommand#1{#2}{\add@accent{#3}}}
%    \end{macrocode}
%
%    \begin{macrocode}
\@onlypreamble\DeclareTextAccent
%    \end{macrocode}
% \end{macro}
%
% \changes{v1.7a}{1994/11/30}{Rewrote \cs{@text@composite} so it
%    allows an empty argument, or an argument containing lots of
%    commands.}  
%
%  \begin{macro}{\add@accent}
% \changes{v1.7z}{1996/05/23}{macro added. latex/2133}
% \changes{v1.91}{2000/08/30}{Rearranged but no change to final code,
%    CAR (pr/3160)}
% To save space this code is shared between all text accents that are
% set using the |\accent| primitive.
% The argument is pre-set in a box so that any
% font loading that is needed is already done within the box.
% This is needed because font-loading involves grouping and that would
% prevent the accent mechanism from working so that the accent would
% not be positioned over the argument.
% Declarations that change the font should be allowed (only low-level
% ones are at present) inside the argument of an accent command,
% but not size changes, as they involve |\setbox| operations which
% also inhibit the mechanism of the |\accent| primitive.
%
% Note that the whole process is within a group.
% \changes{v1.9y}{2000/01/30}{Use \cs{hmode@bgroup} where applicable
%    (pr/3160)}
%    For a detailed discussion of this reimplementation and its
%    deficiencies, see pr/3160.
% \task{Improve this and document its problems, see pr/3160}
% \changes{v1.9z}{2000/01/30}{Macro reimplemented (pr/3160)}
%    \begin{macrocode}
\def\add@accent#1#2{\hmode@bgroup
%    \end{macrocode}
%    Turn off the group in |\UseTextSymbol| in case this is used
%    inside the argument of |\add@accent|.
%    \begin{macrocode}
   \let\hmode@start@before@group\@firstofone
   \setbox\@tempboxa\hbox{#2%
%    \end{macrocode}
%    When presetting the argument in a box we record its |\spacefactor|
%    for later use after the accent got typeset. This way something like
%    |\`A| gets the spacefactor of |A| (i.e., 999) rather than the
%    default value of 1000.
% \changes{v1.9q}{1998/06/12}
%    {Explicitly set \cs{spacefactor} after \cs{accent} (pr/2877)}
%    \begin{macrocode}
      \global\mathchardef\accent@spacefactor\spacefactor}%
   \accent#1 #2\egroup\spacefactor\accent@spacefactor}
%    \end{macrocode}
%    Default definition for |\accent@spacefactor| prevents a horrible
%    death of the above macro inside an unprotected |\edef|.
% \changes{v1.9w}{1999/10/28}{Give \cs{accent@spacefactor} a default
%    definition (pr/3084)}
%    \begin{macrocode}
\let\accent@spacefactor\relax
%    \end{macrocode}
%  \end{macro}
%
% \begin{macro}{\hmode@bgroup}
% \changes{v1.9y}{2000/01/30}{Macro added}
%    \begin{macrocode}
\def\hmode@bgroup{\leavevmode\bgroup}
%    \end{macrocode}
%  \end{macro}
%
%
% \begin{macro}{\DeclareTextCompositeCommand}
% \changes{v1.7z}{1996/05/23}
%      {Modified to cope with new \cs{add@accent} command: required
%      removal of check for one argument-command}
% \begin{macro}{\DeclareTextComposite}
% \changes{v1.7l}{1995/06/09}{Rewrote \cs{DeclareTextComposite} to
%    define the composite as a no-argument command rather than a
%    two-argument command.}  
% \begin{macro}{\@text@composite}
% \begin{macro}{\@text@composite@x}
% \begin{macro}{\@strip@args}
% \changes{v1.8c}{1996/10/27}
%      {Removed macro}
%    Another amusing game to play with |\expandafter|, |\csname|, and
%    |\string|.  When you say
%    |\DeclareTextCompositeCommand{\foo}{T1}{a}{bar}|, we look to see
%    if the expansion of |\T1\foo| begins with |\@text@composite|, and
%    if it doesn't, we redefine |\T1\foo| to be:
%\begin{verbatim}
%    #1 -> \@text@composite \T1\foo #1\@empty \@text@composite {...}
%\end{verbatim}
%    where |...| is the
%    previous definition of |\T1\foo|.  Finally, we define |\\T1\foo-a|
%    to expand to |bar|.
%    \begin{macrocode}
\def\DeclareTextCompositeCommand#1#2#3#4{%
  \expandafter\let\expandafter\reserved@a\csname#2\string#1\endcsname
  \expandafter\expandafter\expandafter\ifx
  \expandafter\@car\reserved@a\relax\relax\@nil \@text@composite \else
      \edef\reserved@b##1{%
         \def\expandafter\noexpand
            \csname#2\string#1\endcsname####1{%
            \noexpand\@text@composite
               \expandafter\noexpand\csname#2\string#1\endcsname
               ####1\noexpand\@empty\noexpand\@text@composite
               {##1}}}%
      \expandafter\reserved@b\expandafter{\reserved@a{##1}}%
   \fi
   \expandafter\def\csname\expandafter\string\csname
      #2\endcsname\string#1-\string#3\endcsname{#4}}
%    \end{macrocode}
%
%    \begin{macrocode}
\@onlypreamble\DeclareTextCompositeCommand
%    \end{macrocode}
%    This all works because:
%\begin{verbatim}
%    \@text@composite \T1\foo A\@empty \@text@composite {...}
%\end{verbatim}
%    expands to
%    |\\T1\foo-A| if |\\T1\foo-A| has been defined, and |{...}|
%    otherwise. 
%
%    Note that |\@text@composite| grabs the first token of the
%    argument and puts just that in the 
%    csname.  This is so that |\'{\textit{e}}| will work---it checks
%    whether |\\T1\'-\textit| is defined (which presumably it isn't)
%    and so expands to |{\accent 1 \textit{e}}|.
%
%    This trick won't always work, for example |\'{{\itshape e}}| will
%    expand to (with spaces added for clarity):
%\begin{verbatim}
%    \csname \string \T1\' - \string {\itshape e} \@empty \endcsname
%\end{verbatim}
%    which will die pretty horribly.  Unfortunately there's not much
%    can be done about this if we're going to use |\csname| lookups as a
%    fast way of accessing composites.
%
%    This has an unfortunate `misfeature' though, which is that in
%    the T1 encoding, |\'{aa}| produces \'a.  This is not the expected
%    behaviour, and should perhaps be fixed if the fix doesn't affect
%    performance too badly.
%
%    Finally, it's worth noting that the |\@empty| is used in
%    |\@text@composite| so that accents will work even when the
%    argument is empty.  If you say |\'{}| then this looks up
%    |\\T1\'-\@empty|, which ought to be |\relax|, and so all is well.
%    If we didn't include the |\@empty|, then |\'{}| would expand to:
%\begin{verbatim}
%    \csname \string \T1\' - \string \endcsname
%\end{verbatim}
%    so the |\endcsname| would be |\string|'ed and the whole of the
%    rest of the document would be put inside the |\csname|.  This
%    would not be good.
%    \begin{macrocode}
\def\@text@composite#1#2#3\@text@composite{%
   \expandafter\@text@composite@x
      \csname\string#1-\string#2\endcsname}
%    \end{macrocode}
%
% \changes{v1.7z}{1996/05/23}
%      {\cs{expandafter} added to match other changes for latex/2133}
% \changes{v1.9r}{1999/01/06}{New impl for latex/2930}
% \changes{v1.9s}{1999/01/13}{Simplified solution for latex/2930}
%    Originally the |\@text@composite@x| macro had two arguments and if
%    |#1| was not |\relax| it was executed, otherwise |#2| was executed.
%    All this happened within the |\ifx| code so that neither |#1|
%    nor |#2| could have picked up any additional arguments form
%    the input stream.
%    This has now being changed using the typical |\@firstoftwo| /
%    |\@secondoftwo| coding. This way the
%    final expansion will happen without any |\else| or |\fi|
%    intervening in the case that we need to get a further token
%    from the input stream.
%    \begin{macrocode}
\def\@text@composite@x#1{%
   \ifx#1\relax
      \expandafter\@secondoftwo
   \else
      \expandafter\@firstoftwo
   \fi
   #1}
%    \end{macrocode}
%    The command |\DeclareTextComposite| uses
%    |\DeclareTextCompositeCommand| to declare a command which
%    expands out to a single glyph.
% \changes{v1.8a}{1996/07/19}
%      {Use char 0 not @ as carrier for \cs{lowercase} /2197}
%    \begin{macrocode}
\catcode\z@=11\relax
%    \end{macrocode}
%
%    \begin{macrocode}
\def\DeclareTextComposite#1#2#3#4{%
   \def\reserved@a{\DeclareTextCompositeCommand#1{#2}{#3}}%
   \bgroup
      \lccode\z@#4%
      \lowercase{%
   \egroup
      \reserved@a ^^@}}
%    \end{macrocode}
%
%    \begin{macrocode}
\catcode\z@=15\relax
%    \end{macrocode}
%
%    \begin{macrocode}
\@onlypreamble\DeclareTextComposite
%    \end{macrocode}
% \end{macro}
% \end{macro}
% \end{macro}
% \end{macro}
% \end{macro}
%
% \begin{macro}{\UseTextAccent}
% \begin{macro}{\UseTextSymbol}
% \changes{v1.7p}{1995/11/17}{Support \cs{@wrong@font@char} latex/1676}
% \changes{v1.7q}{1995/11/18}{Modify message slightly}
% \begin{macro}{\@use@text@encoding}
% \changes{v1.91}{2000/08/30}{Rearranged but no change to final code,
%    CAR (pr/3160)}
%    These fragile commands access glyphs from different encodings.
%    They use grotty low-level calls to the font selection scheme for
%    speed, and in order to make sure that |\UseTextSymbol| doesn't
%    do anything which you're not allowed to do between an |\accent|
%    and its glyph.
%    
%    For a detailed discussion of this reimplementation and its
%    deficiencies, see pr/3160.
% \task{Improve this and document its problems, see pr/3160}
% \changes{v1.9z}{2000/01/30}{Macro reimplemented (pr/3160)}
%    \begin{macrocode}
\def\UseTextAccent#1#2#3{%
  \hmode@start@before@group
   {%
%    \end{macrocode}
%    Turn off the group in |\UseTextSymbol| in case this is used
%    inside the arguments of |\UseTextAccent|.
%    \begin{macrocode}
    \let\hmode@start@before@group\@firstofone
    \let\@curr@enc\cf@encoding
    \@use@text@encoding{#1}%
    #2{\@use@text@encoding\@curr@enc#3}%
   }}
%    \end{macrocode}
%
% \changes{v1.9z}{2000/01/30}{Macro reimplemented (pr/3160)}
%    \begin{macrocode}
\def\UseTextSymbol#1#2{%
       \hmode@start@before@group
       {%
          \def\@wrong@font@char{\MessageBreak
             for \noexpand\symbol`\string#2'}%
          \@use@text@encoding{#1}%
          #2%
       }%
    }
%    \end{macrocode}
%
%    \begin{macrocode}
\def\@use@text@encoding#1{%
   \edef\f@encoding{#1}%
   \xdef\font@name{%
      \csname\curr@fontshape/\f@size\endcsname}%
   \pickup@font
   \font@name
   \@@enc@update}
%    \end{macrocode}
% \end{macro}
% \end{macro}
% \end{macro}
%
% \begin{macro}{\hmode@start@before@group}
%    The |\hmode@start@before@group| starts hmode and should be 
%    immediately followed by an explicit |{...}|. Its purpose is to
%    ensure that hmode is started before this group  is opened. Inside
%    |\add@accent| and |\UseTextAccent| it is redefined to remove this
%    group so that it doesn't conflict with the |\accent| primitive.
%
%    For a detailed discussion see pr/3160.
% \changes{v1.9z}{2000/01/30}{Macro added (pr/3160)}
%    \begin{macrocode}
\let\hmode@start@before@group\leavevmode
%    \end{macrocode}
% \end{macro}
%     
% \begin{macro}{\DeclareTextSymbolDefault}
% \begin{macro}{\DeclareTextAccentDefault}
%    Some syntactic sugar.  Again, these should probably be optimized
%    for speed. 
%    \begin{macrocode}
\def\DeclareTextSymbolDefault#1#2{%
   \DeclareTextCommandDefault#1{\UseTextSymbol{#2}#1}}
%    \end{macrocode}
%
%    \begin{macrocode}
\def\DeclareTextAccentDefault#1#2{%
   \DeclareTextCommandDefault#1{\UseTextAccent{#2}#1}}
%    \end{macrocode}
%
%    \begin{macrocode}
\@onlypreamble\DeclareTextSymbolDefault
\@onlypreamble\DeclareTextAccentDefault
%    \end{macrocode}
% \end{macro}
% \end{macro}
%
%
% \begin{macro}{\UndeclareTextCommand}
%    This command safely removes and encoding specific declaration
%    for a given encoding. It is helpful if one intends to use the
%    default definition always and therefore wants to get rid of
%    a declaration for some specific encoding.
% \changes{v1.9o}{1998/03/20}{Macro added for pr/2783}
%    \begin{macrocode}
\def\UndeclareTextCommand#1#2{%
%    \end{macrocode}
%    If there is no declaration for the current encoding do nothing.
%    (This makes a hash table entry but without e\TeX{} we can't do
%    anything about that).
%    \begin{macrocode}
  \expandafter\ifx\csname#2\string#1\endcsname\relax
  \else
%    \end{macrocode}
%    Else: throw away that declaration.
%    \begin{macrocode}
     \global\expandafter\let\csname#2\string#1\endcsname 
            \@undefined
%    \end{macrocode}
%    But this is unfortunately not enough, we have to take a look
%    at the top-level definition of the encoding specific command 
%    which for a command |\foo| would look similar to 
%    |\T1-cmd \foo \T1\foo| (three tokens).
%
%    Of course, instead of |T1| one could see a different encoding name;
%    which one depends the encoding for which |\foo| was declared
%    last. 
%
%    Now assume we have just removed the declaration for |\foo| in |T1|
%    and the top-level of |\foo| expands to the above. Then we better
%    change that pretty fast otherwise we do get an ``undefined csname
%    error'' when we try to typeset |\foo| within |T1| instead of
%    getting the default definition for |\foo|.
%    And what is the best way to change that top-level definition? Well,
%    the only ``encoding'' we know for sure will still be around is
%    the default encoding denoted by |?|.
%
%    Thus in case the last token of the top-level expansion
%    is now undefined we change the declaration to look like
%    |\?-cmd \foo \?\foo| which is done by the following
%    (readable?) code:
%    \begin{macrocode}
     \expandafter\expandafter\expandafter
     \ifx\expandafter\@thirdofthree#1\@undefined
       \expandafter\gdef\expandafter#1\expandafter
          {\csname ?-cmd\expandafter\endcsname\expandafter
           #1\csname?\string#1\endcsname}%
     \fi
 \fi
}
%    \end{macrocode}
%
%    \begin{macrocode}
\@onlypreamble\UndeclareTextCommand
%    \end{macrocode}
% \end{macro}
%
%
% \subsubsection{Hyphenation}
%
% \changes{v1.5l}{1994/10/18}{Added new definitions of \cs{patterns}
%    and \cs{hyphenation}.}
% \changes{v1.6g}{1994/11/05}{Added setting of \cs{@typeset@protect}
%    to \cs{patterns} and \cs{hyphenation}.}
% \changes{v1.6g}{1994/11/30}{Removed new definitions of \cs{patterns}
%    and \cs{hyphenation}, since encoding-specific commands now expand
%    in the mouth.}
%
% \begin{macro}{\patterns}
% \begin{macro}{\@@patterns}
% \begin{macro}{\hyphenation}
% \begin{macro}{\@@hyphenation}
%    We redefine |\patterns| and |\hyphenation| to allow the use of 
%    commands declared with |\DeclareText*| to be used inside them.
%    \begin{macrocode}
%\let\@@patterns\patterns
%\let\@@hyphenation\hyphenation
%\def\patterns{%
%   \bgroup
%      \let\protect\@empty
%      \let\@typeset@protect\@empty
%      \let\@changed@x\@changed@x@mouth
%   \afterassignment\egroup   
%   \@@patterns
%}
%\def\hyphenation{%
%   \bgroup
%      \let\protect\@empty
%      \let\@typeset@protect\@empty
%      \let\@changed@x\@changed@x@mouth
%   \afterassignment\egroup   
%   \@@hyphenation
%}
%    \end{macrocode}
% \end{macro}
% \end{macro}
% \end{macro}
% \end{macro}
%
% \subsubsection{Miscellania}
%
% \changes{1.4a}{1994/05/01}{Added the \cs{a} command.}
% \changes{1.7a}{1994/11/30}{Redefined \cs{a} for the new scheme.}
% \changes{1.7b}{1994/12/02}{Redefined \cs{a} properly.}
% \changes{1.7g}{1995/03/03}{Corrected an error in documentation
%               referring to the tabular rather than the tabbing
%               environment.}
% \changes{v1.7n}{1995/11/02}{Changed internal name \cs{a} to
% \cs{@tabacckludge} to protect against redefinition by malicicous
% users.}
%
% \begin{macro}{\a}
%    The |\a| command is used to access the accent commands even when
%    they have been redefined (for example by the |tabbing|
%    environment). Its internal name is |\@tabacckludge|.
%
%    The |\string| within the |\csname| guards against something
%    like |'| being active at the point of use.
% \changes{v1.9r}{1998/09/19}{Added \cs{string} (pr/2878)}
%    \begin{macrocode}
\def\@tabacckludge#1{\expandafter\@changed@cmd
                                 \csname\string#1\endcsname\relax}
\let\a=\@tabacckludge
%    \end{macrocode}
% \end{macro}
%
% \changes{v1.6a}{1994/10/25}{Added the files OT1enc.def, T1enc.def and 
%    OMSenc.def.} 
% \changes{v1.6b}{1994/10/27}{Removed the files OT1enc.def, T1enc.def
%    and OMSenc.def.} 
% 
% \subsubsection{Default encodings}
%
% We define the default encodings for most commands to be either OT1,
% OML or OMS.  These defaults are in the kernel and therefore
% fonts with these encodings must be available unless these
% defaults are redefined elsewhere.  Recall that the standard kernel
% loads the encoding files for these encodings, and also that for
% the T1 encoding. 
%
% The naming conventions in the kernel are not what we would use if we 
% were starting from scratch\dots\  
% Those defined by DEK (like |\ae| and |\ss|) or by the \TeX{} Users
% Group Technical Working Group on multi-lingual typesetting (like 
% |\th| and |\ng|) have short names.  Those which were added to the 
% kernel in 1993 and early 1994 are named after their Adobe glyph
% names (like |\guillemotleft| and |\quotedblbase|).  Unfortunately,
% this naming scheme won't work for all glyphs, since some names (like 
% |\space|) are already used, and some (like |\endash|) are very
% likely to be defined by users.  So we're now using the naming scheme
% of |\text| followed by the Adobe name, (like |\textendash| and 
% |\textsterling|).  Except that some glyphs don't have Adobe names,
% so we're using the names used by fontinst for those (like 
% |\textcompwordmark|).  Sigh.
%
% \changes{v1.6a}{1994/10/25}{Added the defaults.} 
% \changes{v1.6b}{1994/10/27}{Added more defaults for OT1.} 
% \changes{v1.6c}{1994/10/29}{Added commands like \cs{dots} for use in 
%    text and math.} 
% 
% Some accents from OT1:
%    \begin{macrocode}
\DeclareTextAccentDefault{\"}{OT1}
\DeclareTextAccentDefault{\'}{OT1}
\DeclareTextAccentDefault{\.}{OT1}
\DeclareTextAccentDefault{\=}{OT1}
\DeclareTextAccentDefault{\H}{OT1}
\DeclareTextAccentDefault{\^}{OT1}
\DeclareTextAccentDefault{\`}{OT1}
\DeclareTextAccentDefault{\b}{OT1}
\DeclareTextAccentDefault{\c}{OT1}
\DeclareTextAccentDefault{\d}{OT1}
\DeclareTextAccentDefault{\r}{OT1}
\DeclareTextAccentDefault{\u}{OT1}
\DeclareTextAccentDefault{\v}{OT1}
\DeclareTextAccentDefault{\~}{OT1}
%    \end{macrocode}
% Some symbols from OT1:
% \changes{v1.8c}{1996/10/27}
%      {Removed \cs{aa} and \cs{AA}}
%    \begin{macrocode}
%\DeclareTextSymbolDefault{\AA}{OT1}
\DeclareTextSymbolDefault{\AE}{OT1}
\DeclareTextSymbolDefault{\L}{OT1}
\DeclareTextSymbolDefault{\OE}{OT1}
\DeclareTextSymbolDefault{\O}{OT1}
%\DeclareTextSymbolDefault{\aa}{OT1}
\DeclareTextSymbolDefault{\ae}{OT1}
\DeclareTextSymbolDefault{\i}{OT1}
\DeclareTextSymbolDefault{\j}{OT1}
\DeclareTextSymbolDefault{\l}{OT1}
\DeclareTextSymbolDefault{\oe}{OT1}
\DeclareTextSymbolDefault{\o}{OT1}
\DeclareTextSymbolDefault{\ss}{OT1}
\DeclareTextSymbolDefault{\textdollar}{OT1}
\DeclareTextSymbolDefault{\textemdash}{OT1}
\DeclareTextSymbolDefault{\textendash}{OT1}
\DeclareTextSymbolDefault{\textexclamdown}{OT1}
%\DeclareTextSymbolDefault{\texthyphenchar}{OT1}
%\DeclareTextSymbolDefault{\texthyphen}{OT1}
\DeclareTextSymbolDefault{\textquestiondown}{OT1}
\DeclareTextSymbolDefault{\textquotedblleft}{OT1}
\DeclareTextSymbolDefault{\textquotedblright}{OT1}
\DeclareTextSymbolDefault{\textquoteleft}{OT1}
\DeclareTextSymbolDefault{\textquoteright}{OT1}
\DeclareTextSymbolDefault{\textsterling}{OT1}
%    \end{macrocode}
% Some symbols from OMS:
% \changes{v1.7t}{1995/11/29}{Added \cs{textbackslash} and
%    \cs{textbar}.} 
% \changes{v1.8c}{1996/10/27}
%      {Added \cs{textasteriskcentered}}
%    \begin{macrocode}
\DeclareTextSymbolDefault{\textasteriskcentered}{OMS}
\DeclareTextSymbolDefault{\textbackslash}{OMS}
\DeclareTextSymbolDefault{\textbar}{OMS}
\DeclareTextSymbolDefault{\textbraceleft}{OMS}
\DeclareTextSymbolDefault{\textbraceright}{OMS}
\DeclareTextSymbolDefault{\textbullet}{OMS}
\DeclareTextSymbolDefault{\textdaggerdbl}{OMS}
\DeclareTextSymbolDefault{\textdagger}{OMS}
\DeclareTextSymbolDefault{\textparagraph}{OMS}
\DeclareTextSymbolDefault{\textperiodcentered}{OMS}
\DeclareTextSymbolDefault{\textsection}{OMS}
\DeclareTextAccentDefault{\textcircled}{OMS}
%    \end{macrocode}
%
% \changes{v1.6d}{1994/10/30}{Added OML encoding.}
% \changes{v1.6d}{1994/10/30}{Made \cs{textless} and \cs{textgreater} 
%    come from OML.}
% \changes{v1.6d}{1994/10/30}{Added \cs{t}.}
% \changes{v1.7k}{1995/06/05}{Commented out \cs{textless} and
%    \cs{textgreater}.} 
%
% Some symbols from OML:
% \changes{v1.7t}{1995/11/29}{Added \cs{textless} and
%    \cs{textgreater}.} 
%    \begin{macrocode}
\DeclareTextSymbolDefault{\textless}{OML}
\DeclareTextSymbolDefault{\textgreater}{OML}
\DeclareTextAccentDefault{\t}{OML}
%    \end{macrocode}
%
% \changes{v1.6d}{1994/10/30}{Added \cs{textcircled}.}
% \changes{v1.6d}{1994/10/30}{Rewrote \cs{copyright} to use
%    \cs{textcircled}.} 
% \changes{v1.6d}{1994/10/30}{Removed \cs{textregistered}.}
% \changes{v1.7k}{1995/06/05}{Save some tokens in
%    \cs{textvisiblespace} and \cs{textunderscore}.}
% \changes{v1.7t}{1995/11/29}{Added \cs{textasciicircum},
%    \cs{textasciitilde}, \cs{textregistered} and \cs{texttrademark}.}
% \changes{v1.7u}{1995/12/01}{Made \cs{SS} a Default, rather than
%    having the default point to the OT1 definition.}
% \changes{v1.7w}{1995/12/11}{Modified \cs{copyright}}
% \changes{v1.9a}{1997/04/30}{Introduced \cs{textcopyright} and modified
%                             \cs{copyright}}
%
% Some defaults we can fake.
% 
% The interface for defining |\copyright| changed, it used to
% use |\expandafter| to add braces at the appropriate points.
% \begin{macrocode}
\DeclareTextCommandDefault{\textcopyright}{\textcircled{c}}
% \expandafter\def\expandafter
%                 \copyright\expandafter{\expandafter{\copyright}}
%    \end{macrocode}
%
% \changes{v1.9a}{1997/04/30}{Modified \cs{textunderscore}, removing
%                                    \cs{mathunderscore}}
% \changes{v1.9b}{1997/04/30}{Added \cs{leavevmode} to
%                                   \cs{textunderscore}}
% \changes{v1.9d}{1997/05/07}{Added \cs{leavevmode} to
%                                   \cs{textcompwordmark}}
%    \begin{macrocode}
\DeclareTextCommandDefault{\textasciicircum}{\^{}}
\DeclareTextCommandDefault{\textasciitilde}{\~{}}
\DeclareTextCommandDefault{\textcompwordmark}{\leavevmode\kern\z@}
\DeclareTextCommandDefault{\textunderscore}{%
  \leavevmode \kern.06em\vbox{\hrule\@width.3em}}
%    \end{macrocode}
%
%    \begin{macrocode}
\DeclareTextCommandDefault{\textvisiblespace}{%
   \mbox{\kern.06em\vrule \@height.3ex}%
   \vbox{\hrule \@width.3em}%
   \hbox{\vrule \@height.3ex}}
%    \end{macrocode}
%
%    \begin{macrocode}
\DeclareTextCommandDefault{\textellipsis}{%
   .\kern\fontdimen3\font
   .\kern\fontdimen3\font
   .\kern\fontdimen3\font}
%    \end{macrocode}
%
% \changes{v1.9a}{1997/04/30}{Changed \cs{textsc} to \cs{scshape}}
%    \begin{macrocode}
\DeclareTextCommandDefault{\textregistered}{\textcircled{\scshape r}}
\DeclareTextCommandDefault{\texttrademark}{\textsuperscript{TM}}
\DeclareTextCommandDefault{\SS}{SS}
%    \end{macrocode}
%
% \changes{v1.9n}{1998/03/05}{Added masc/fem ords as in pr/2579}
%    \begin{macrocode}
\DeclareTextCommandDefault{\textordfeminine}{\textsuperscript{a}}
\DeclareTextCommandDefault{\textordmasculine}{\textsuperscript{o}}
%    \end{macrocode}
%    
% \subsubsection{Math material}
%
%    Some commands can be used in both text and math mode:
%    \begin{macrocode}
\DeclareRobustCommand{\$}{\ifmmode\mathdollar\else\textdollar\fi}
\DeclareRobustCommand{\{}{\ifmmode\lbrace\else\textbraceleft\fi}
\DeclareRobustCommand{\}}{\ifmmode\rbrace\else\textbraceright\fi}
\DeclareRobustCommand{\P}{\ifmmode\mathparagraph\else\textparagraph\fi}
\DeclareRobustCommand{\S}{\ifmmode\mathsection\else\textsection\fi}
\DeclareRobustCommand{\dag}{\ifmmode{\dagger}\else\textdagger\fi}
\DeclareRobustCommand{\ddag}{\ifmmode{\ddagger}\else\textdaggerdbl\fi}
%    \end{macrocode}
% 
% For historical reasons |\copyright|
% needs |{}| around the definition in maths.
%
% \changes{v1.6f}{1994/11/04}{Added \cmd\_.}
%
% \changes{v1.9a}{1997/04/30}{Modified \cs{underscore}, removing
%                                    \cs{mathunderscore}}
% \changes{v1.9a}{1997/04/30}{Introduced \cs{textcopyright} and modify
%                             \cs{copyright}}
%    \begin{macrocode}
\DeclareRobustCommand{\_}{%
   \ifmmode\nfss@text{\textunderscore}\else\textunderscore\fi}
\DeclareRobustCommand{\copyright}{%
   \ifmmode{\nfss@text{\textcopyright}}\else\textcopyright\fi}
\DeclareRobustCommand{\pounds}{%
   \ifmmode\mathsterling\else\textsterling\fi}
%    \end{macrocode}
%
%    \begin{macrocode}
\DeclareRobustCommand{\dots}{%
   \ifmmode\mathellipsis\else\textellipsis\fi}
%    \end{macrocode}
%
%    \begin{macrocode}
\let\ldots\dots
%</2ekernel|autoload>
%    \end{macrocode}
% 
% \changes{v1.6d}{1994/10/30}{Moved math commands here from ltmath.}
% \changes{v1.6f}{1994/11/04}{Added \cs{mathunderscore}.}
% \changes{v1.7k}{1995/06/05}{Moved math commands to fontdef.dtx.}
%
% 
% \changes{1.4a}{1994/05/01}{Added the \cs{SaveAtCatcode} and
%    \cs{RestoreAtCatcode} commands.}
%
% \changes{1.5a}{1994/05/12}{Removed the \cs{SaveAtCatcode} and
%    \cs{RestoreAtCatcode} commands.}
%
% \subsection{The fontenc package}
%
% \changes{v1.5c}{1994/05/14}{Added the fontenc package}
% \changes{v1.5g}{1994/05/16}{Removed the lowercasing of the filename.}
% \changes{v1.7a}{1994/11/30}{Always load the enc.def file, so that
%    the default encoding for the commands will change.}
% \changes{v1.7x}{1996/05/18}{Produce error if encoding not found. 
%                             pr/2054}
% \changes{v1.7y}{1996/05/21}{Corrected error message (CAR)}
% \changes{v1.8d}{1996/11/18}
%     {(DPC) lowercase external file names. internal/1044}%
% This package allows authors to specify which encodings they will use.
% For each encoding |FOO|, the package looks to see if the encoding
% |FOO| has already been declared.  If it has not, the file |fooenc.def|
% is loaded.  The default encoding is set to be |FOO|.
%
% In addition the package at the moment contains extra code to extend
% the |\@uclclist| (list of upper/lower case pairs) for encodings that
% involve cyrillic characters. THIS IS A TEMPORARY SOLUTION and will not
% stay this way forever (or so we hope) but right now we are missing a 
% proper interface for this and didn't wanted to rush it.
% \changes{v1.9r}{1999/01/07}{Hackery to temp support cyrillic uc/lc}
% \changes{v1.9t}{1999/02/24}{Corrected hackery cyrillic uc/lc list}
% \changes{v1.9x}{1999/12/08}{Changed \cs{CYRRHOOK} and  \cs{cyrrhook}
%    to\cs{CYRRHK} and  \cs{cyrrhk} as name changed in the cyrillic
%    bundle for naming consistency with other ``hook'' glyphs.}
%    \begin{macrocode}
%<*package>
%    \end{macrocode}
%
% Here we define a macro that extends the |\@uclclist| if needed and
% aferwards turns itself in a noop.
%    \begin{macrocode}
\def\update@uclc@with@cyrillic{%
 \expandafter\def\expandafter\@uclclist\expandafter
  {\@uclclist
  \cyra\CYRA\cyrabhch\CYRABHCH\cyrabhchdsc\CYRABHCHDSC\cyrabhdze
  \CYRABHDZE\cyrabhha\CYRABHHA\cyrae\CYRAE\cyrb\CYRB\cyrbyus
  \CYRBYUS\cyrc\CYRC\cyrch\CYRCH\cyrchldsc\CYRCHLDSC\cyrchrdsc
  \CYRCHRDSC\cyrchvcrs\CYRCHVCRS\cyrd\CYRD\cyrdelta\CYRDELTA
  \cyrdje\CYRDJE\cyrdze\CYRDZE\cyrdzhe\CYRDZHE\cyre\CYRE\cyreps
  \CYREPS\cyrerev\CYREREV\cyrery\CYRERY\cyrf\CYRF\cyrfita
  \CYRFITA\cyrg\CYRG\cyrgdsc\CYRGDSC\cyrgdschcrs\CYRGDSCHCRS
  \cyrghcrs\CYRGHCRS\cyrghk\CYRGHK\cyrgup\CYRGUP\cyrh\CYRH
  \cyrhdsc\CYRHDSC\cyrhhcrs\CYRHHCRS\cyrhhk\CYRHHK\cyrhrdsn
  \CYRHRDSN\cyri\CYRI\cyrie\CYRIE\cyrii\CYRII\cyrishrt\CYRISHRT
  \cyrishrtdsc\CYRISHRTDSC\cyrizh\CYRIZH\cyrje\CYRJE\cyrk\CYRK
  \cyrkbeak\CYRKBEAK\cyrkdsc\CYRKDSC\cyrkhcrs\CYRKHCRS\cyrkhk
  \CYRKHK\cyrkvcrs\CYRKVCRS\cyrl\CYRL\cyrldsc\CYRLDSC\cyrlhk
  \CYRLHK\cyrlje\CYRLJE\cyrm\CYRM\cyrmdsc\CYRMDSC\cyrmhk\CYRMHK
  \cyrn\CYRN\cyrndsc\CYRNDSC\cyrng\CYRNG\cyrnhk\CYRNHK\cyrnje
  \CYRNJE\cyrnlhk\CYRNLHK\cyro\CYRO\cyrotld\CYROTLD\cyrp\CYRP
  \cyrphk\CYRPHK\cyrq\CYRQ\cyrr\CYRR\cyrrdsc\CYRRDSC\cyrrhk
  \CYRRHK\cyrrtick\CYRRTICK\cyrs\CYRS\cyrsacrs\CYRSACRS
  \cyrschwa\CYRSCHWA\cyrsdsc\CYRSDSC\cyrsemisftsn\CYRSEMISFTSN
  \cyrsftsn\CYRSFTSN\cyrsh\CYRSH\cyrshch\CYRSHCH\cyrshha\CYRSHHA
  \cyrt\CYRT\cyrtdsc\CYRTDSC\cyrtetse\CYRTETSE\cyrtshe\CYRTSHE
  \cyru\CYRU\cyrushrt\CYRUSHRT\cyrv\CYRV\cyrw\CYRW\cyry\CYRY
  \cyrya\CYRYA\cyryat\CYRYAT\cyryhcrs\CYRYHCRS\cyryi\CYRYI\cyryo
  \CYRYO\cyryu\CYRYU\cyrz\CYRZ\cyrzdsc\CYRZDSC\cyrzh\CYRZH
  \cyrzhdsc\CYRZHDSC}%
 \let\update@uclc@with@cyrillic\relax
}
%    \end{macrocode}
%
% Here we process each option:
%    \begin{macrocode}
\DeclareOption*{%
   \let\encodingdefault\CurrentOption
   \edef\reserved@f{%
     \lowercase{\def\noexpand\reserved@f{\CurrentOption enc.def}}}%
   \reserved@f
   \InputIfFileExists\reserved@f
        {}{\PackageError{fontenc}%
         {Encoding file `\reserved@f' not found.%
          \MessageBreak
           You might have misspelt the name of the encoding}%
         {Necessary code for this encoding was not
          loaded.\MessageBreak
          Thus calling the encoding later on will
          produce further error messages.}}%
  \let\reserved@f\relax
%    \end{macrocode}
%
% In case the current encoding is one of a list of known
% cyrillic ones we extend the |\@uclclist|:
%    \begin{macrocode}
  \expandafter\in@\expandafter{\CurrentOption}%
                              {T2A,T2B,T2C,X2,LCY,OT2}%
  \ifin@
%    \end{macrocode}
%
% But only if it hasn't already been extended. This might happen if
% there are several calls to fontenc loading one of the above
% encodings. If we don't do this check the |\@uclclist| gets
% unnecessarily big slowing down the processing at runtime.
% \changes{v1.9v}{1999/06/12}{Extend \cs{@uclclist} only once}
%    \begin{macrocode}
     \expandafter\in@\expandafter\cyra\expandafter
                              {\@uclclist}%
     \ifin@
     \else
       \update@uclc@with@cyrillic
     \fi
  \fi
}
%    \end{macrocode}
%
%    \begin{macrocode}
\ProcessOptions*
%    \end{macrocode}
%
%    \begin{macrocode}
\fontencoding\encodingdefault\selectfont
%    \end{macrocode}
%
% To save some space we get rid of the macro extending the
% |\@uclclist| (might have happened already).
%    \begin{macrocode}
\let\update@uclc@with@cyrillic\relax
%    \end{macrocode}
%
% Finally we pretend that the fontenc package wasn't read in. This 
% allows for using it several times, e.g., in a class file and in the
% preamble (at the cost of not getting any version info). 
% That kind of hackery shows that using a general purpose 
% package just for loading an encoding is not the right kind 
% of interface for setting up encodings --- it will get replaced at 
% some point in the future.
% \changes{v1.9r}{1999/01/07}{Hackery to allow using fontenc several
%    times}
% \changes{v1.9u}{1999/06/10}{Ensure that we also forget old options
%                             (pr/2888)}
%    \begin{macrocode}
\global\expandafter\let\csname ver@fontenc.sty\endcsname\relax    
\global\expandafter\let\csname opt@fontenc.sty\endcsname\relax
\global\let\@ifl@ter@@\@ifl@ter
\def\@ifl@ter#1#2#3#4#5{\global\let\@ifl@ter\@ifl@ter@@}
%</package>
%    \end{macrocode}
%
% \subsection{Definitions for the OT1 encoding}
%
% \changes{1.3}{1993/12/17}{Removed all the hackery for use in
%    \cs{DeclareFontEncoding}, and redid everything using
%    \cs{DeclareTextFoo}.}
% \changes{1.3b}{1993/12/18}{Replaced the missing last argument to
%    \cs{DeclareFontEncoding}.}
% \changes{1.3c}{1993/12/18}{Rewrote for the new syntax of
%    \cs{EncodingSpecific}.}
% \changes{1.4a}{1994/05/01}{Rewrote for the new syntax.}
% \changes{1.5a}{1994/05/12}{Rewrote for the new syntax.}
% \changes{1.5h}{1994/05/16}{\cs{pounds} was still using u rather than
%    ui shape.}
% \changes{1.6b}{1994/10/27}{Added:
%   \cs{textemdash}
%   \cs{textendash}
%   \cs{textexclamdown}
%   \cs{texthyphenchar}
%   \cs{texthyphen}
%   \cs{textquestiondown}
%   \cs{textquotedblleft}
%   \cs{textquotedblright}
%   \cs{textquoteleft}
%   \cs{textquoteright}
% }
%
% The definitions for the `\TeX{} text' (OT1) encoding.
%
%    Declare the encoding.    
%    \begin{macrocode}
%<*OT1>
\DeclareFontEncoding{OT1}{}{}
%    \end{macrocode}
%    Declare the accents.
%    \begin{macrocode}
\DeclareTextAccent{\"}{OT1}{127}
\DeclareTextAccent{\'}{OT1}{19}
\DeclareTextAccent{\.}{OT1}{95}
\DeclareTextAccent{\=}{OT1}{22}
\DeclareTextAccent{\^}{OT1}{94}
\DeclareTextAccent{\`}{OT1}{18}
\DeclareTextAccent{\~}{OT1}{126}
\DeclareTextAccent{\H}{OT1}{125}
\DeclareTextAccent{\u}{OT1}{21}
\DeclareTextAccent{\v}{OT1}{20}
\DeclareTextAccent{\r}{OT1}{23}
%    \end{macrocode}
%    Some accents have to be built by hand:
%    Note that |\ooalign| and |\o@lign| must be inside a group.
% \changes{v1.7j}{1995/05/21}{Updated some plain macros}
% \changes{v1.7o}{1995/11/07}{Added \cs{leavevmode} at start of
% \cs{c}, otherwise the output routine might be invoked within the
% macro.}
% \changes{v1.9y}{2000/01/30}{Use \cs{hmode@bgroup} where applicable
%    (pr/3160)}
%    \begin{macrocode}
\DeclareTextCommand{\b}{OT1}[1]
   {\hmode@bgroup\o@lign{\relax#1\crcr\hidewidth\sh@ft{29}%
     \vbox to.2ex{\hbox{\char22}\vss}\hidewidth}\egroup}
\DeclareTextCommand{\c}{OT1}[1]
   {\leavevmode\setbox\z@\hbox{#1}\ifdim\ht\z@=1ex\accent24 #1%
    \else{\ooalign{\unhbox\z@\crcr\hidewidth\char24\hidewidth}}\fi}
\DeclareTextCommand{\d}{OT1}[1]
   {\hmode@bgroup
    \o@lign{\relax#1\crcr\hidewidth\sh@ft{10}.\hidewidth}\egroup}
%    \end{macrocode}
%    Declare the text symbols.
%    \begin{macrocode}
\DeclareTextSymbol{\AE}{OT1}{29}
\DeclareTextSymbol{\OE}{OT1}{30}
\DeclareTextSymbol{\O}{OT1}{31}
\DeclareTextSymbol{\ae}{OT1}{26}
\DeclareTextSymbol{\i}{OT1}{16}
\DeclareTextSymbol{\j}{OT1}{17}
\DeclareTextSymbol{\oe}{OT1}{27}
\DeclareTextSymbol{\o}{OT1}{28}
\DeclareTextSymbol{\ss}{OT1}{25}
\DeclareTextSymbol{\textemdash}{OT1}{124}
\DeclareTextSymbol{\textendash}{OT1}{123}
\DeclareTextSymbol{\textexclamdown}{OT1}{60}
%\DeclareTextSymbol{\texthyphenchar}{OT1}{`\-}
%\DeclareTextSymbol{\texthyphen}{OT1}{`\-}
\DeclareTextSymbol{\textquestiondown}{OT1}{62}
\DeclareTextSymbol{\textquotedblleft}{OT1}{92}
\DeclareTextSymbol{\textquotedblright}{OT1}{`\"}
\DeclareTextSymbol{\textquoteleft}{OT1}{`\`}
\DeclareTextSymbol{\textquoteright}{OT1}{`\'}
%    \end{macrocode}
%    Some symbols which are faked from others:
% \changes{v1.7o}{1995/11/07}{Changed \cs{char}32 to \cs{@xxxii} (two
% tokens less).}
% \changes{v1.7o}{1995/11/07}{Replaced octal number 27 by decimal
% number 23 to protect against the quote character being active.}
% \changes{v1.7o}{1995/11/07}{Replaced some 0's by \cs{z@} (faster).}
% \changes{v1.8c}{1996/10/27}
%      {Removed \cs{aa} and \cs{AA}}
% \changes{v1.9y}{2000/01/30}{Use \cs{hmode@bgroup} where applicable
%    (pr/3160)}
%    \begin{macrocode}
% \DeclareTextCommand{\aa}{OT1}
%    {{\accent23a}}
\DeclareTextCommand{\L}{OT1}
   {\leavevmode\setbox\z@\hbox{L}\hb@xt@\wd\z@{\hss\@xxxii L}}
\DeclareTextCommand{\l}{OT1}
   {\hmode@bgroup\@xxxii l\egroup}
% \DeclareTextCommand{\AA}{OT1}
%    {\leavevmode\setbox\z@\hbox{h}\dimen@\ht\z@\advance\dimen@-1ex%
%     \rlap{\raise.67\dimen@\hbox{\char23}}A}
%    \end{macrocode}
%    In the OT1 encoding \r A has a hand-crafted defintion, so we
%    have here the first recorded explicit use of
%    |\DeclareTextCompositeCommand|. 
% \changes{v1.8c}{1996/10/27}
%      {Added \cs{r} A}
%    \begin{macrocode}
\DeclareTextCompositeCommand{\r}{OT1}{A}
   {\leavevmode\setbox\z@\hbox{h}\dimen@\ht\z@\advance\dimen@-1ex%
    \rlap{\raise.67\dimen@\hbox{\char23}}A} 
%    \end{macrocode}
%    In the OT1 encoding, \pounds~and \$ share a slot.
% \changes{v1.9y}{2000/01/30}{Use \cs{hmode@bgroup} where applicable
%    (pr/3160)}
%    \begin{macrocode}
\DeclareTextCommand{\textdollar}{OT1}{\hmode@bgroup
   \ifdim \fontdimen\@ne\font >\z@
      \slshape
   \else
      \upshape
   \fi
   \char`\$\egroup}
%    \end{macrocode}
%
%    \begin{macrocode}
\DeclareTextCommand{\textsterling}{OT1}{\hmode@bgroup
   \ifdim \fontdimen\@ne\font >\z@
      \itshape
   \else
      \fontshape{ui}\selectfont
   \fi
   \char`\$\egroup}
%    \end{macrocode}
%
%    \begin{macrocode}
%</OT1>
%    \end{macrocode}
%
% \subsection{Definitions for the T1 encoding}
%
% \changes{1.3}{1993/12/17}{Removed all the hackery for use in
%    \cs{DeclareFontEncoding}, and redid everything using
%    \cs{DeclareTextFoo}.}
% \changes{1.3b}{1993/12/18}{Replaced the missing last argument to
%    \cs{DeclareFontEncoding}.}
% \changes{1.3c}{1993/12/18}{Rewrote for the new syntax of
%    \cs{EncodingSpecific}.}
% \changes{1.4a}{1994/05/01}{Rewrote for the new syntax.}
% \changes{1.5a}{1994/05/12}{Rewrote for the new syntax.}
% \changes{1.6a}{1994/10/25}{Added \cs{textdollar}, 
%    \cs{textlbrace}, \cs{textrbrace}, \cs{textsterling},
%    \cs{textunderline}.} 
% \changes{1.6a}{1994/10/25}{Removed
%    \cs{textlbrace}, \cs{textrbrace}, \cs{textunderline} to give them 
%    their proper names.}
% \changes{1.6b}{1994/10/27}{Added 
%   \cs{textasciicircum}
%   \cs{textasciitilde}
%   \cs{textbackslash}
%   \cs{textbar}
%   \cs{textbraceleft}
%   \cs{textbraceright}
%   \cs{textcompwordmark}
%   \cs{textemdash}
%   \cs{textendash}
%   \cs{textexclamdown}
%   \cs{textgreater}
%   \cs{texthyphenchar}
%   \cs{texthyphen}
%   \cs{textless}
%   \cs{textquestiondown}
%   \cs{textquotedblleft}
%   \cs{textquotedblright}
%   \cs{textquotedbl}
%   \cs{textquoteleft}
%   \cs{textquoteright}
%   \cs{textunderscore}
%   \cs{textvisiblespace}
% }
% \changes{v1.9h}{1997/12/17}
%    {Added \cs{textperthousand} and \cs{textpertenthousand}}
%
% The definitions for the `Extended \TeX{} text' (T1) encoding.
%
%    Declare the encoding.
%    \begin{macrocode}
%<*T1>
\DeclareFontEncoding{T1}{}{}
%    \end{macrocode}
%    Declare the accents.
%    \begin{macrocode}
\DeclareTextAccent{\`}{T1}{0}
\DeclareTextAccent{\'}{T1}{1}
\DeclareTextAccent{\^}{T1}{2}
\DeclareTextAccent{\~}{T1}{3}
\DeclareTextAccent{\"}{T1}{4}
\DeclareTextAccent{\H}{T1}{5}
\DeclareTextAccent{\r}{T1}{6}
\DeclareTextAccent{\v}{T1}{7}
\DeclareTextAccent{\u}{T1}{8}
\DeclareTextAccent{\=}{T1}{9}
\DeclareTextAccent{\.}{T1}{10}
%    \end{macrocode}
%    Some accents have to be built by hand.
%    Note that |\ooalign| and |\o@lign| must be inside a group.
% \changes{v1.9h}{1997/12/17}{As in OT1, Added \cs{leavevmode} at
% start of \cs{c}, otherwise the output routine might be invoked
% within the macro.}
% \changes{v1.9y}{2000/01/30}{Use \cs{hmode@bgroup} where applicable
%    (pr/3160)}
%    \begin{macrocode}
\DeclareTextCommand{\b}{T1}[1]
   {\hmode@bgroup\o@lign{\relax#1\crcr\hidewidth\sh@ft{29}%
     \vbox to.2ex{\hbox{\char9}\vss}\hidewidth}\egroup}
\DeclareTextCommand{\c}{T1}[1]
   {\leavevmode\setbox\z@\hbox{#1}\ifdim\ht\z@=1ex\accent11 #1%
     \else{\ooalign{\hidewidth\char11\hidewidth
        \crcr\unhbox\z@}}\fi}
\DeclareTextCommand{\d}{T1}[1]
   {\hmode@bgroup
    \o@lign{\relax#1\crcr\hidewidth\sh@ft{10}.\hidewidth}\egroup}
\DeclareTextCommand{\k}{T1}[1]
   {\oalign{\null#1\crcr\hidewidth\char12}}
%    \end{macrocode}
%    
%    Some symbols are constructed.
%
% \changes{v1.9h}{1997/12/17}
%    {Added \cs{textperthousand} and \cs{textpertenthousand}}
%    Slot 24 contains a small circle intended for construction of
%    these two glyphs.
%    
%    \begin{macrocode}
\DeclareTextCommand{\textperthousand}{T1}
   {\%\char 24 }          % space or `relax as delimiter?
\DeclareTextCommand{\textpertenthousand}{T1}
   {\%\char 24\char 24 }  % space or `relax as delimiter?
%    \end{macrocode}
%    
%    Declare the text symbols.
% \changes{v1.7t}{1995/11/29}{Added \cs{textasciicircum},
%    \cs{textasciitilde}, \cs{textbackslash}, \cs{textbar},
%    \cs{textgreater} and \cs{textless}.} 
% \changes{v1.8c}{1996/10/27}
%      {Removed \cs{aa} and \cs{AA}}
%      
%    \begin{macrocode}
%\DeclareTextSymbol{\AA}{T1}{197}
\DeclareTextSymbol{\AE}{T1}{198}
\DeclareTextSymbol{\DH}{T1}{208}
\DeclareTextSymbol{\DJ}{T1}{208}
\DeclareTextSymbol{\L}{T1}{138}
\DeclareTextSymbol{\NG}{T1}{141}
\DeclareTextSymbol{\OE}{T1}{215}
\DeclareTextSymbol{\O}{T1}{216}
\DeclareTextSymbol{\SS}{T1}{223}
\DeclareTextSymbol{\TH}{T1}{222}
%\DeclareTextSymbol{\aa}{T1}{229}
\DeclareTextSymbol{\ae}{T1}{230}
\DeclareTextSymbol{\dh}{T1}{240}
\DeclareTextSymbol{\dj}{T1}{158}
\DeclareTextSymbol{\guillemotleft}{T1}{19}
\DeclareTextSymbol{\guillemotright}{T1}{20}
\DeclareTextSymbol{\guilsinglleft}{T1}{14}
\DeclareTextSymbol{\guilsinglright}{T1}{15}
\DeclareTextSymbol{\i}{T1}{25}
\DeclareTextSymbol{\j}{T1}{26}
\DeclareTextSymbol{\l}{T1}{170}
\DeclareTextSymbol{\ng}{T1}{173}
\DeclareTextSymbol{\oe}{T1}{247}
\DeclareTextSymbol{\o}{T1}{248}
\DeclareTextSymbol{\quotedblbase}{T1}{18}
\DeclareTextSymbol{\quotesinglbase}{T1}{13}
\DeclareTextSymbol{\ss}{T1}{255}
\DeclareTextSymbol{\textasciicircum}{T1}{`\^}
\DeclareTextSymbol{\textasciitilde}{T1}{`\~}
\DeclareTextSymbol{\textbackslash}{T1}{`\\}
\DeclareTextSymbol{\textbar}{T1}{`\|}
\DeclareTextSymbol{\textbraceleft}{T1}{`\{}
\DeclareTextSymbol{\textbraceright}{T1}{`\}}
\DeclareTextSymbol{\textcompwordmark}{T1}{23}
\DeclareTextSymbol{\textdollar}{T1}{`\$}
\DeclareTextSymbol{\textemdash}{T1}{22}
\DeclareTextSymbol{\textendash}{T1}{21}
\DeclareTextSymbol{\textexclamdown}{T1}{189}
\DeclareTextSymbol{\textgreater}{T1}{`\>}
%\DeclareTextSymbol{\texthyphenchar}{T1}{127}
%\DeclareTextSymbol{\texthyphen}{T1}{`\-}
\DeclareTextSymbol{\textless}{T1}{`\<}
\DeclareTextSymbol{\textquestiondown}{T1}{190}
\DeclareTextSymbol{\textquotedblleft}{T1}{16}
\DeclareTextSymbol{\textquotedblright}{T1}{17}
\DeclareTextSymbol{\textquotedbl}{T1}{`\"}
\DeclareTextSymbol{\textquoteleft}{T1}{`\`}
\DeclareTextSymbol{\textquoteright}{T1}{`\'}
\DeclareTextSymbol{\textsection}{T1}{159}
\DeclareTextSymbol{\textsterling}{T1}{191}
\DeclareTextSymbol{\textunderscore}{T1}{95}
\DeclareTextSymbol{\textvisiblespace}{T1}{32}
\DeclareTextSymbol{\th}{T1}{254}
%    \end{macrocode}
%    Declare the composites.
%    \begin{macrocode}
\DeclareTextComposite{\.}{T1}{i}{`\i}
%    \end{macrocode}
% \changes{v1.9c}{1997/05/04}{Added `hex index tabs'}
%    "80 = 128
%    \begin{macrocode}
\DeclareTextComposite{\u}{T1}{A}{128}
\DeclareTextComposite{\k}{T1}{A}{129}
\DeclareTextComposite{\'}{T1}{C}{130}
\DeclareTextComposite{\v}{T1}{C}{131}
\DeclareTextComposite{\v}{T1}{D}{132}
\DeclareTextComposite{\v}{T1}{E}{133}
\DeclareTextComposite{\k}{T1}{E}{134}
\DeclareTextComposite{\u}{T1}{G}{135}
%    \end{macrocode}
%    "88 = 136
%    \begin{macrocode}
\DeclareTextComposite{\'}{T1}{L}{136}
\DeclareTextComposite{\v}{T1}{L}{137}
\DeclareTextComposite{\'}{T1}{N}{139}
\DeclareTextComposite{\v}{T1}{N}{140}
\DeclareTextComposite{\H}{T1}{O}{142}
\DeclareTextComposite{\'}{T1}{R}{143}
%    \end{macrocode}
%    "90 = 144
%    \begin{macrocode}
\DeclareTextComposite{\v}{T1}{R}{144}
\DeclareTextComposite{\'}{T1}{S}{145}
\DeclareTextComposite{\v}{T1}{S}{146}
\DeclareTextComposite{\c}{T1}{S}{147}
\DeclareTextComposite{\v}{T1}{T}{148}
\DeclareTextComposite{\c}{T1}{T}{149}
\DeclareTextComposite{\H}{T1}{U}{150}
\DeclareTextComposite{\r}{T1}{U}{151}
%    \end{macrocode}
%    "98 = 152
%    \begin{macrocode}
\DeclareTextComposite{\"}{T1}{Y}{152}
\DeclareTextComposite{\'}{T1}{Z}{153}
\DeclareTextComposite{\v}{T1}{Z}{154}
\DeclareTextComposite{\.}{T1}{Z}{155}
\DeclareTextComposite{\.}{T1}{I}{157}
%    \end{macrocode}
%    "A0 = 160
%    \begin{macrocode}
\DeclareTextComposite{\u}{T1}{a}{160}
\DeclareTextComposite{\k}{T1}{a}{161}
\DeclareTextComposite{\'}{T1}{c}{162}
\DeclareTextComposite{\v}{T1}{c}{163}
\DeclareTextComposite{\v}{T1}{d}{164}
\DeclareTextComposite{\v}{T1}{e}{165}
\DeclareTextComposite{\k}{T1}{e}{166}
\DeclareTextComposite{\u}{T1}{g}{167}
%    \end{macrocode}
%    "A8 = 168
%    \begin{macrocode}
\DeclareTextComposite{\'}{T1}{l}{168}
\DeclareTextComposite{\v}{T1}{l}{169}
\DeclareTextComposite{\'}{T1}{n}{171}
\DeclareTextComposite{\v}{T1}{n}{172}
\DeclareTextComposite{\H}{T1}{o}{174}
\DeclareTextComposite{\'}{T1}{r}{175}
%    \end{macrocode}
%    "B0 = 176
%    \begin{macrocode}
\DeclareTextComposite{\v}{T1}{r}{176}
\DeclareTextComposite{\'}{T1}{s}{177}
\DeclareTextComposite{\v}{T1}{s}{178}
\DeclareTextComposite{\c}{T1}{s}{179}
\DeclareTextComposite{\v}{T1}{t}{180}
\DeclareTextComposite{\c}{T1}{t}{181}
\DeclareTextComposite{\H}{T1}{u}{182}
\DeclareTextComposite{\r}{T1}{u}{183}
%    \end{macrocode}
%    "B8 = 184
%    \begin{macrocode}
\DeclareTextComposite{\"}{T1}{y}{184}
\DeclareTextComposite{\'}{T1}{z}{185}
\DeclareTextComposite{\v}{T1}{z}{186}
\DeclareTextComposite{\.}{T1}{z}{187}
%    \end{macrocode}
%    "C0 = 192
%    \begin{macrocode}
\DeclareTextComposite{\`}{T1}{A}{192}
\DeclareTextComposite{\'}{T1}{A}{193}
\DeclareTextComposite{\^}{T1}{A}{194}
\DeclareTextComposite{\~}{T1}{A}{195}
\DeclareTextComposite{\"}{T1}{A}{196}
\DeclareTextComposite{\r}{T1}{A}{197}
\DeclareTextComposite{\c}{T1}{C}{199}
%    \end{macrocode}
%    "C8 = 200
%    \begin{macrocode}
\DeclareTextComposite{\`}{T1}{E}{200}
\DeclareTextComposite{\'}{T1}{E}{201}
\DeclareTextComposite{\^}{T1}{E}{202}
\DeclareTextComposite{\"}{T1}{E}{203}
\DeclareTextComposite{\`}{T1}{I}{204}
\DeclareTextComposite{\'}{T1}{I}{205}
\DeclareTextComposite{\^}{T1}{I}{206}
\DeclareTextComposite{\"}{T1}{I}{207}
%    \end{macrocode}
%    "D0 = 208
%    \begin{macrocode}
\DeclareTextComposite{\~}{T1}{N}{209}
\DeclareTextComposite{\`}{T1}{O}{210}
\DeclareTextComposite{\'}{T1}{O}{211}
\DeclareTextComposite{\^}{T1}{O}{212}
\DeclareTextComposite{\~}{T1}{O}{213}
\DeclareTextComposite{\"}{T1}{O}{214}
%    \end{macrocode}
%    "D8 = 216
%    \begin{macrocode}
\DeclareTextComposite{\`}{T1}{U}{217}
\DeclareTextComposite{\'}{T1}{U}{218}
\DeclareTextComposite{\^}{T1}{U}{219}
\DeclareTextComposite{\"}{T1}{U}{220}
\DeclareTextComposite{\'}{T1}{Y}{221}
%    \end{macrocode}
%    "E0 = 224
%    \begin{macrocode}
\DeclareTextComposite{\`}{T1}{a}{224}
\DeclareTextComposite{\'}{T1}{a}{225}
\DeclareTextComposite{\^}{T1}{a}{226}
\DeclareTextComposite{\~}{T1}{a}{227}
\DeclareTextComposite{\"}{T1}{a}{228}
\DeclareTextComposite{\r}{T1}{a}{229}
\DeclareTextComposite{\c}{T1}{c}{231}
%    \end{macrocode}
%    "E8 = 232
%    \begin{macrocode}
\DeclareTextComposite{\`}{T1}{e}{232}
\DeclareTextComposite{\'}{T1}{e}{233}
\DeclareTextComposite{\^}{T1}{e}{234}
\DeclareTextComposite{\"}{T1}{e}{235}
\DeclareTextComposite{\`}{T1}{i}{236}
\DeclareTextComposite{\`}{T1}{\i}{236}
\DeclareTextComposite{\'}{T1}{i}{237}
\DeclareTextComposite{\'}{T1}{\i}{237}
\DeclareTextComposite{\^}{T1}{i}{238}
\DeclareTextComposite{\^}{T1}{\i}{238}
\DeclareTextComposite{\"}{T1}{i}{239}
\DeclareTextComposite{\"}{T1}{\i}{239}
%    \end{macrocode}
%    "F0 = 240
%    \begin{macrocode}
\DeclareTextComposite{\~}{T1}{n}{241}
\DeclareTextComposite{\`}{T1}{o}{242}
\DeclareTextComposite{\'}{T1}{o}{243}
\DeclareTextComposite{\^}{T1}{o}{244}
\DeclareTextComposite{\~}{T1}{o}{245}
\DeclareTextComposite{\"}{T1}{o}{246}
%    \end{macrocode}
%    "F8 = 248
%    \begin{macrocode}
\DeclareTextComposite{\`}{T1}{u}{249}
\DeclareTextComposite{\'}{T1}{u}{250}
\DeclareTextComposite{\^}{T1}{u}{251}
\DeclareTextComposite{\"}{T1}{u}{252}
\DeclareTextComposite{\'}{T1}{y}{253}
%    \end{macrocode}
%
%    \begin{macrocode}
%</T1>
%    \end{macrocode}
%
% \changes{1.4a}{1994/05/01}{Removed the uc/lc table settings, since
%    the T1 uc/lc table is now the default.}
%
% \subsection{Definitions for the OMS encoding}
%
% \changes{v1.6a}{1994/10/25}{Added the OMS encoding.}
% \changes{v1.6b}{1994/10/27}{Renamed \cs{textlbrace} to 
%    \cs{textbraceleft} and \cs{textrbrace} to \cs{textbraceright}.}
% \changes{v1.6b}{1994/10/27}{Added \cs{textbackslash}.}
% \changes{v1.6d}{1994/10/30}{Added \cs{textcircled}.}
%
% The definitions for the `\TeX{} math symbol' (OMS) encoding.  Even 
% though this is meant to be a math font, it includes some of the
% standard \LaTeX{} text symbols.
%
%    Declare the encoding.
%    \begin{macrocode}
%<*OMS>
\DeclareFontEncoding{OMS}{}{}
%    \end{macrocode}
%    Declare the symbols.
% \changes{v1.7t}{1995/11/29}{Added \cs{textbackslash} and
%    \cs{textbar}.} 
% \changes{v1.8c}{1996/10/27}
%      {Added \cs{textasteriskcentered}}
% \changes{v1.9y}{2000/01/30}{Use \cs{hmode@bgroup} where applicable
%    (pr/3160)}
%    \begin{macrocode}
\DeclareTextSymbol{\textasteriskcentered}{OMS}{3}   % "03
\DeclareTextSymbol{\textbackslash}{OMS}{110}        % "6E
\DeclareTextSymbol{\textbar}{OMS}{106}              % "6A
\DeclareTextSymbol{\textbraceleft}{OMS}{102}        % "66
\DeclareTextSymbol{\textbraceright}{OMS}{103}       % "67
\DeclareTextSymbol{\textbullet}{OMS}{15}            % "0F
\DeclareTextSymbol{\textdaggerdbl}{OMS}{122}        % "7A
\DeclareTextSymbol{\textdagger}{OMS}{121}           % "79
\DeclareTextSymbol{\textparagraph}{OMS}{123}        % "7B
\DeclareTextSymbol{\textperiodcentered}{OMS}{1}     % "01
\DeclareTextSymbol{\textsection}{OMS}{120}          % "78
\DeclareTextCommand{\textcircled}{OMS}[1]{\hmode@bgroup
   \ooalign{%
      \hfil \raise .07ex\hbox {\upshape#1}\hfil \crcr 
      \char 13 % "0D
   }%
 \egroup}
%</OMS>
%    \end{macrocode}
%
% \subsection{Definitions for the OML encoding}
%
% \changes{v1.6d}{1994/10/30}{Added the OML encoding.}
%
% The definitions for the `\TeX{} math italic' (OML) encoding.  Even 
% though this is meant to be a math font, it includes some of the
% standard \LaTeX{} text symbols.
%
%    Declare the encoding.
%    \begin{macrocode}
%<*OML>
\DeclareFontEncoding{OML}{}{}
%    \end{macrocode}
%    Declare the symbols.
% \changes{v1.7t}{1995/11/29}{Added \cs{textless} and
%    \cs{textgreater}.} 
% \changes{v1.9h}{1997/12/17}{Changed to decimal codes.}
% \changes{v1.9m}{1998/01/16}{fixed decimal codes. latex/2734}
%    \begin{macrocode}
\DeclareTextSymbol{\textless}{OML}{`\<}
\DeclareTextSymbol{\textgreater}{OML}{`\>}
\DeclareTextAccent{\t}{OML}{127}  % "7F
%</OML>
%    \end{macrocode}
%
% \subsection{Definitions for the OT4 encoding}
% 
% These definitions are for the Polish extension to the
% `\TeX\ text' (OT1) encoding.
% This encoding was created by B.~Jackowski and M.~Ry\'cko
% for use with the Polish version of Computer Modern and Computer
% Concrete.  In positions 0--127 it is identical to OT1 but it
% contains some additional characters in the upper half.  The \LaTeX{} 
% support was developed by Mariusz Olko.
% 
% The PL fonts that use it are available as follows:\\
% Metafont sources
% \texttt{ftp://ftp.gust.org.pl/TeX/language/polish/pl-mf.zip};
%
% Font files
% \texttt{ftp://ftp.gust.org.pl/TeX/language/polish/pl-tfm.zip}.
% 
%    Declare the encoding.
%    \begin{macrocode}
%<*OT4>
\DeclareFontEncoding{OT4}{}{}
\DeclareFontSubstitution{OT4}{cmr}{m}{n}
%    \end{macrocode}
%    Declare the accents.
%    \begin{macrocode}
\DeclareTextAccent{\"}{OT4}{127}
\DeclareTextAccent{\'}{OT4}{19}
\DeclareTextAccent{\.}{OT4}{95}
\DeclareTextAccent{\=}{OT4}{22}
\DeclareTextAccent{\^}{OT4}{94}
\DeclareTextAccent{\`}{OT4}{18}
\DeclareTextAccent{\~}{OT4}{126}
\DeclareTextAccent{\H}{OT4}{125}
\DeclareTextAccent{\u}{OT4}{21}
\DeclareTextAccent{\v}{OT4}{20}
\DeclareTextAccent{\r}{OT4}{23}
%    \end{macrocode}
%    The ogonek accent is available only under a e A \& E.  But we
%    have to provide some definition for \cs{k}. Some other accents
%    have to be built by hand as in OT1:
% \changes{v1.9y}{2000/01/30}{Use \cs{hmode@bgroup} where applicable
%    (pr/3160)}
%    \begin{macrocode}
\DeclareTextCommand{\k}{OT4}[1]{%
    \TextSymbolUnavailable{\k{#1}}#1}
\DeclareTextCommand{\b}{OT4}[1]
   {\hmode@bgroup\o@lign{\relax#1\crcr\hidewidth\sh@ft{29}%
     \vbox to.2ex{\hbox{\char22}\vss}\hidewidth}\egroup}
\DeclareTextCommand{\c}{OT4}[1]
   {\leavevmode\setbox\z@\hbox{#1}\ifdim\ht\z@=1ex\accent24 #1%
    \else{\ooalign{\unhbox\z@\crcr\hidewidth\char24\hidewidth}}\fi}
\DeclareTextCommand{\d}{OT4}[1]
   {\hmode@bgroup
    \o@lign{\relax#1\crcr\hidewidth\sh@ft{10}.\hidewidth}\egroup}
%    \end{macrocode}
%    Declare the text symbols.
%    \begin{macrocode}
\DeclareTextSymbol{\AE}{OT4}{29}
\DeclareTextSymbol{\OE}{OT4}{30}
\DeclareTextSymbol{\O}{OT4}{31}
\DeclareTextSymbol{\L}{OT4}{138}
\DeclareTextSymbol{\ae}{OT4}{26}
\DeclareTextSymbol{\guillemotleft}{OT4}{174}
\DeclareTextSymbol{\guillemotright}{OT4}{175}
\DeclareTextSymbol{\i}{OT4}{16}
\DeclareTextSymbol{\j}{OT4}{17}
\DeclareTextSymbol{\l}{OT4}{170}
\DeclareTextSymbol{\o}{OT4}{28}
\DeclareTextSymbol{\oe}{OT4}{27}
\DeclareTextSymbol{\quotedblbase}{OT4}{255}
\DeclareTextSymbol{\ss}{OT4}{25}
\DeclareTextSymbol{\textemdash}{OT4}{124}
\DeclareTextSymbol{\textendash}{OT4}{123}
\DeclareTextSymbol{\textexclamdown}{OT4}{60}
%\DeclareTextSymbol{\texthyphenchar}{OT4}{`\-}
%\DeclareTextSymbol{\texthyphen}{OT4}{`\-}
\DeclareTextSymbol{\textquestiondown}{OT4}{62}
\DeclareTextSymbol{\textquotedblleft}{OT4}{92}
\DeclareTextSymbol{\textquotedblright}{OT4}{`\"}
\DeclareTextSymbol{\textquoteleft}{OT4}{`\`}
\DeclareTextSymbol{\textquoteright}{OT4}{`\'}
%    \end{macrocode}
%    Definition for \r A as in OT1:
%    \begin{macrocode}
\DeclareTextCompositeCommand{\r}{OT4}{A}
   {\leavevmode\setbox\z@\hbox{h}\dimen@\ht\z@\advance\dimen@-1ex%
    \rlap{\raise.67\dimen@\hbox{\char23}}A} 
%    \end{macrocode}
%    In the OT4 encoding, \pounds~and \$ share a slot.
% \changes{v1.9y}{2000/01/30}{Use \cs{hmode@bgroup} where applicable
%    (pr/3160)}
%    \begin{macrocode}
\DeclareTextCommand{\textdollar}{OT4}{\hmode@bgroup
   \ifdim \fontdimen\@ne\font >\z@
      \slshape
   \else
      \upshape
   \fi
   \char`\$\egroup}
\DeclareTextCommand{\textsterling}{OT4}{\hmode@bgroup
   \ifdim \fontdimen\@ne\font >\z@
      \itshape 
   \else 
      \fontshape{ui}\selectfont 
   \fi 
   \char`\$\egroup}
%    \end{macrocode}
%    Declare the composites.
%    \begin{macrocode}
\DeclareTextComposite{\k}{OT4}{A}{129}
\DeclareTextComposite{\'}{OT4}{C}{130}
\DeclareTextComposite{\k}{OT4}{E}{134}
\DeclareTextComposite{\'}{OT4}{N}{139}
\DeclareTextComposite{\'}{OT4}{S}{145}
\DeclareTextComposite{\'}{OT4}{Z}{153}
\DeclareTextComposite{\.}{OT4}{Z}{155}
\DeclareTextComposite{\k}{OT4}{a}{161}
\DeclareTextComposite{\'}{OT4}{c}{162}
\DeclareTextComposite{\k}{OT4}{e}{166}
\DeclareTextComposite{\'}{OT4}{n}{171}
\DeclareTextComposite{\'}{OT4}{s}{177}
\DeclareTextComposite{\'}{OT4}{z}{185}
\DeclareTextComposite{\.}{OT4}{z}{187}
\DeclareTextComposite{\'}{OT4}{O}{211}
\DeclareTextComposite{\'}{OT4}{o}{243}
%</OT4>
%    \end{macrocode}
%
%
% \changes{v1.9c}{1997/05/04}{Added TS1 encoding v2.2.beta}
% \changes{v1.9g}{1997/11/23}
%    {Use \cs{textperthousand}, \cs{textpertenthousand} and
%          \cs{textfractionsolidus} not
%         \cs{textpermill}, \cs{textpertenmill} and \cs{textfraction}.
%         /2673 }
% \changes{v1.9h}{1997/12/17}
%     {Removed default settings, see next section.}
%
%    \begin{macrocode}
%<*TS1>
\DeclareFontEncoding{TS1}{}{}
\DeclareFontSubstitution{TS1}{cmr}{m}{n}
%    \end{macrocode}
%    Some accents have to be built by hand.
%    Note that |\ooalign| and |\o@lign| must be inside a group.
% \changes{v1.9y}{2000/01/30}{Use \cs{hmode@bgroup} where applicable
%    (pr/3160)}
%    \begin{macrocode}
\DeclareTextCommand{\capitalcedilla}{TS1}[1]
   {\hmode@bgroup
    \ooalign{\null#1\crcr\hidewidth\char11\hidewidth}\egroup}
\DeclareTextCommand{\capitalogonek}{TS1}[1]
   {\hmode@bgroup
    \ooalign{\null#1\crcr\hidewidth\char12\hidewidth}\egroup}
%    \end{macrocode}
%
% Accents for capital letters.
%
% These commands can be used by the end user either directly or through 
% definitions of the type
% \begin{verbatim}
% \DeclareTextCompositeCommand{\'}{T1}{X}{\capitalacute X}
% \end{verbatim}
% None of the latter definitions are provided by default, since they
% are probably rarely used.
% 
%    "00 = 0
%    \begin{macrocode}
\DeclareTextAccent{\capitalgrave}{TS1}{0}
\DeclareTextAccent{\capitalacute}{TS1}{1}
\DeclareTextAccent{\capitalcircumflex}{TS1}{2}
\DeclareTextAccent{\capitaltilde}{TS1}{3}
\DeclareTextAccent{\capitaldieresis}{TS1}{4}
\DeclareTextAccent{\capitalhungarumlaut}{TS1}{5}
\DeclareTextAccent{\capitalring}{TS1}{6}
\DeclareTextAccent{\capitalcaron}{TS1}{7}
%    \end{macrocode}
%    "08 = 8 
%    \begin{macrocode}
\DeclareTextAccent{\capitalbreve}{TS1}{8}
\DeclareTextAccent{\capitalmacron}{TS1}{9}
\DeclareTextAccent{\capitaldotaccent}{TS1}{10}
%    \end{macrocode}
% Tie accents.
%
% The tie accent was borrowed from the |cmmi| font. The tc fonts
% now provide four tie accents, the first two are done in the
% classical way with assymetric glyphs hanging out of their boxes;
% the new ties are centered in their boxes like all other accents.
% They need a name: please tell us if you know what to call them.
%
%    " = 
%    \begin{macrocode}
\DeclareTextAccent{\t}{TS1}{26}
\DeclareTextAccent{\capitaltie}{TS1}{27}
\DeclareTextAccent{\newtie}{TS1}{28}
\DeclareTextAccent{\capitalnewtie}{TS1}{29}
%    \end{macrocode}
%
% Compund word marks.
%
% The text companion fonts contain two compound word marks of
% different heights, one has |cap_height|, the other |asc_height|.
%
%    \begin{macrocode}
\DeclareTextSymbol{\textcapitalcompwordmark}{TS1}{23}
\DeclareTextSymbol{\textascendercompwordmark}{TS1}{31}
%    \end{macrocode}
%
% The text companion symbols.
%
%    \begin{macrocode}
\DeclareTextSymbol{\textquotestraightbase}{TS1}{13}
%    \end{macrocode}
%    "10 = 16
%    \begin{macrocode}
\DeclareTextSymbol{\textquotestraightdblbase}{TS1}{18}
\DeclareTextSymbol{\texttwelveudash}{TS1}{21}
\DeclareTextSymbol{\textthreequartersemdash}{TS1}{22}
%    \end{macrocode}
%    "18 = 24
%    \begin{macrocode}
\DeclareTextSymbol{\textleftarrow}{TS1}{24}
\DeclareTextSymbol{\textrightarrow}{TS1}{25}
%    \end{macrocode}
%    "20 = 32 
%    \begin{macrocode}
\DeclareTextSymbol{\textblank}{TS1}{32}
\DeclareTextSymbol{\textdollar}{TS1}{36}
\DeclareTextSymbol{\textquotesingle}{TS1}{39}
%    \end{macrocode}
%    "28 = 40 
%    \begin{macrocode}
\DeclareTextSymbol{\textasteriskcentered}{TS1}{42}
%    \end{macrocode}
% Note that '054 is a comma and '056 is a full stop: these make
% numbers using oldstyle digits easier to input.
%    \begin{macrocode}
\DeclareTextSymbol{\textdblhyphen}{TS1}{45}
\DeclareTextSymbol{\textfractionsolidus}{TS1}{47}
%    \end{macrocode}
%
% Oldstyle digits.
%
%    "30 = 48 
%    \begin{macrocode}
\DeclareTextSymbol{\textzerooldstyle}{TS1}{48}
\DeclareTextSymbol{\textoneoldstyle}{TS1}{49}
\DeclareTextSymbol{\texttwooldstyle}{TS1}{50}
\DeclareTextSymbol{\textthreeoldstyle}{TS1}{51}
\DeclareTextSymbol{\textfouroldstyle}{TS1}{52}
\DeclareTextSymbol{\textfiveoldstyle}{TS1}{53}
\DeclareTextSymbol{\textsixoldstyle}{TS1}{54}
\DeclareTextSymbol{\textsevenoldstyle}{TS1}{55}
%    \end{macrocode}
%    "38 = 56 
%    \begin{macrocode}
\DeclareTextSymbol{\texteightoldstyle}{TS1}{56}
\DeclareTextSymbol{\textnineoldstyle}{TS1}{57}
%    \end{macrocode}
%
% More text companion symbols.
%
%    \begin{macrocode}
\DeclareTextSymbol{\textlangle}{TS1}{60}
\DeclareTextSymbol{\textminus}{TS1}{61}
\DeclareTextSymbol{\textrangle}{TS1}{62}
%    \end{macrocode}
%    "48 = 72
%    \begin{macrocode}
\DeclareTextSymbol{\textmho}{TS1}{77}
%    \end{macrocode}
%
% \changes{v1.9r}{1999/01/06}{Minor documentation fix.}
% The big circle is here to define the command \cs{textcircled}.
% Formerly it was taken from the |cmsy| font.
% \changes{v1.9h}{1997/12/17}{Changed to decimal codes in \cs{ooalign}.}
% \changes{v1.9k}{1998/01/12}{Adding missing braces and \cs{ushape}.}
% \changes{v1.9y}{2000/01/30}{Use \cs{hmode@bgroup} where applicable
%    (pr/3160)}
%    \begin{macrocode}
\DeclareTextSymbol{\textbigcircle}{TS1}{79}
\DeclareTextCommand{\textcircled}{TS1}[1]{\hmode@bgroup
   \ooalign{%
      \hfil \raise .07ex\hbox {\upshape#1}\hfil \crcr
      \char 79   % '117 = "4F
   }%
 \egroup}
%    \end{macrocode}
%
% More text companion symbols.
%
%    "50 = 80 
%    \begin{macrocode}
\DeclareTextSymbol{\textohm}{TS1}{87}
%    \end{macrocode}
%    "58 = 88 
%    \begin{macrocode}
\DeclareTextSymbol{\textlbrackdbl}{TS1}{91}
\DeclareTextSymbol{\textrbrackdbl}{TS1}{93}
\DeclareTextSymbol{\textuparrow}{TS1}{94}
\DeclareTextSymbol{\textdownarrow}{TS1}{95}
%    \end{macrocode}
%    "60 = 96 
%    \begin{macrocode}
\DeclareTextSymbol{\textasciigrave}{TS1}{96}
\DeclareTextSymbol{\textborn}{TS1}{98}
\DeclareTextSymbol{\textdivorced}{TS1}{99}
\DeclareTextSymbol{\textdied}{TS1}{100}
%    \end{macrocode}
%    "68 = 104 
%    \begin{macrocode}
\DeclareTextSymbol{\textleaf}{TS1}{108}
\DeclareTextSymbol{\textmarried}{TS1}{109}
\DeclareTextSymbol{\textmusicalnote}{TS1}{110}
%    \end{macrocode}
%    "78 = 120 
%    \begin{macrocode}
\DeclareTextSymbol{\texttildelow}{TS1}{126}
%    \end{macrocode}
%
% This glyph, |\textdblhyphenchar| is hanging, like the hyphenchar of
% the ec fonts.
%
%    \begin{macrocode}
\DeclareTextSymbol{\textdblhyphenchar}{TS1}{127}
%    \end{macrocode}
%    "80 = 128 
%    \begin{macrocode}
\DeclareTextSymbol{\textasciibreve}{TS1}{128}
\DeclareTextSymbol{\textasciicaron}{TS1}{129}
%    \end{macrocode}
%
% This next glyph is \emph{not} the same as |\textquotedbl|.
%
% \changes{v1.9p}{1998/06/12}{Corrected 130 and 131, see pr/2834}
%    \begin{macrocode}
\DeclareTextSymbol{\textacutedbl}{TS1}{130}
\DeclareTextSymbol{\textgravedbl}{TS1}{131} 
\DeclareTextSymbol{\textdagger}{TS1}{132}
\DeclareTextSymbol{\textdaggerdbl}{TS1}{133}
\DeclareTextSymbol{\textbardbl}{TS1}{134}
\DeclareTextSymbol{\textperthousand}{TS1}{135}
%    \end{macrocode}
%    "88 = 136
%    \begin{macrocode}
\DeclareTextSymbol{\textbullet}{TS1}{136}
\DeclareTextSymbol{\textcelsius}{TS1}{137}
\DeclareTextSymbol{\textdollaroldstyle}{TS1}{138}
\DeclareTextSymbol{\textcentoldstyle}{TS1}{139}
\DeclareTextSymbol{\textflorin}{TS1}{140}
\DeclareTextSymbol{\textcolonmonetary}{TS1}{141}
\DeclareTextSymbol{\textwon}{TS1}{142}
\DeclareTextSymbol{\textnaira}{TS1}{143}
%    \end{macrocode}
%    "90 = 144 
%    \begin{macrocode}
\DeclareTextSymbol{\textguarani}{TS1}{144}
\DeclareTextSymbol{\textpeso}{TS1}{145}
\DeclareTextSymbol{\textlira}{TS1}{146}
\DeclareTextSymbol{\textrecipe}{TS1}{147}
\DeclareTextSymbol{\textinterrobang}{TS1}{148}
\DeclareTextSymbol{\textinterrobangdown}{TS1}{149}
\DeclareTextSymbol{\textdong}{TS1}{150}
\DeclareTextSymbol{\texttrademark}{TS1}{151}
%    \end{macrocode}
%    "98 = 152 
%    \begin{macrocode}
\DeclareTextSymbol{\textpertenthousand}{TS1}{152}
\DeclareTextSymbol{\textpilcrow}{TS1}{153}
\DeclareTextSymbol{\textbaht}{TS1}{154}
\DeclareTextSymbol{\textnumero}{TS1}{155}
%    \end{macrocode}
% This next name may change.
% For the following sign we know only a german name, which is 
% abz\"uglich. The meaning is something like ``commercial minus''. 
% An ASCII ersatz is ./. (dot slash dot).
% The temporary English name is |\textdiscount|.
%    \begin{macrocode}
\DeclareTextSymbol{\textdiscount}{TS1}{156}
\DeclareTextSymbol{\textestimated}{TS1}{157}
\DeclareTextSymbol{\textopenbullet}{TS1}{158}
\DeclareTextSymbol{\textservicemark}{TS1}{159}
%    \end{macrocode}
%    "A0 = 160 
%    \begin{macrocode}
\DeclareTextSymbol{\textlquill}{TS1}{160}
\DeclareTextSymbol{\textrquill}{TS1}{161}
\DeclareTextSymbol{\textcent}{TS1}{162}
\DeclareTextSymbol{\textsterling}{TS1}{163}
\DeclareTextSymbol{\textcurrency}{TS1}{164}
\DeclareTextSymbol{\textyen}{TS1}{165}
\DeclareTextSymbol{\textbrokenbar}{TS1}{166}
\DeclareTextSymbol{\textsection}{TS1}{167}
%    \end{macrocode}
%    "A8 = 168
%    \begin{macrocode}
\DeclareTextSymbol{\textasciidieresis}{TS1}{168}
\DeclareTextSymbol{\textcopyright}{TS1}{169}
\DeclareTextSymbol{\textordfeminine}{TS1}{170}
\DeclareTextSymbol{\textcopyleft}{TS1}{171}
\DeclareTextSymbol{\textlnot}{TS1}{172}
%    \end{macrocode}
%
% The meaning of the circled-P is ``sound recording copyright''.
%
% \changes{v1.9p}{1998/06/12}{Renamed \cs{textmacron} pr/2840}
%    \begin{macrocode}
\DeclareTextSymbol{\textcircledP}{TS1}{173}
\DeclareTextSymbol{\textregistered}{TS1}{174}
\DeclareTextSymbol{\textasciimacron}{TS1}{175}
%    \end{macrocode}
%    "B0 = 176
%    \begin{macrocode}
\DeclareTextSymbol{\textdegree}{TS1}{176}
\DeclareTextSymbol{\textpm}{TS1}{177}
\DeclareTextSymbol{\texttwosuperior}{TS1}{178}
\DeclareTextSymbol{\textthreesuperior}{TS1}{179}
\DeclareTextSymbol{\textasciiacute}{TS1}{180}
\DeclareTextSymbol{\textmu}{TS1}{181} % micro sign
\DeclareTextSymbol{\textparagraph}{TS1}{182}
\DeclareTextSymbol{\textperiodcentered}{TS1}{183}
%    \end{macrocode}
%    "B8 = 184
%    \begin{macrocode}
\DeclareTextSymbol{\textreferencemark}{TS1}{184}
\DeclareTextSymbol{\textonesuperior}{TS1}{185}
\DeclareTextSymbol{\textordmasculine}{TS1}{186}
\DeclareTextSymbol{\textsurd}{TS1}{187}
\DeclareTextSymbol{\textonequarter}{TS1}{188}
\DeclareTextSymbol{\textonehalf}{TS1}{189}
\DeclareTextSymbol{\textthreequarters}{TS1}{190}
\DeclareTextSymbol{\texteuro}{TS1}{191}
%    \end{macrocode}
%    "E0 = 208
%    \begin{macrocode}
\DeclareTextSymbol{\texttimes}{TS1}{214}
%    \end{macrocode}
%    "F0 = 240
%    \begin{macrocode}
\DeclareTextSymbol{\textdiv}{TS1}{246}
%</TS1>
%    \end{macrocode}
%    
% \section{Package files}
%
% \changes{v1.9h}{1997/12/17}{Added section.}
% \changes{v1.9h}{1997/12/17}{Added code for textcomp.sty.}
%    This file now also contains some packages that provide access to
%    the more specialised encodings.
%
%    This one is for the |TS1| encoding which contains text symbols
%    for use with the |T1|-encoded text fonts.  It therefore first
%    inputs the file |TS1enc.def| and then sets (or resets) the
%    defaults for the symbols it contains.  The result of this is that
%    when one of these symbols is accessed and the current encoding
%    does not provide it, the symbol will be supplied by a silent,
%    local change to this encoding.
%    
%    \begin{macrocode}
%<*TS1sty>
\DeclareTextAccentDefault{\textcircled}{TS1}
\DeclareTextAccentDefault{\capitalcedilla}{TS1}
\DeclareTextAccentDefault{\capitalogonek}{TS1}
\DeclareTextAccentDefault{\capitalgrave}{TS1}
\DeclareTextAccentDefault{\capitalacute}{TS1}
\DeclareTextAccentDefault{\capitalcircumflex}{TS1}
\DeclareTextAccentDefault{\capitaltilde}{TS1}
\DeclareTextAccentDefault{\capitaldieresis}{TS1}
\DeclareTextAccentDefault{\capitalhungarumlaut}{TS1}
\DeclareTextAccentDefault{\capitalring}{TS1}
\DeclareTextAccentDefault{\capitalcaron}{TS1}
\DeclareTextAccentDefault{\capitalbreve}{TS1}
\DeclareTextAccentDefault{\capitalmacron}{TS1}
\DeclareTextAccentDefault{\capitaldotaccent}{TS1}
\DeclareTextAccentDefault{\t}{TS1}
\DeclareTextAccentDefault{\capitaltie}{TS1}
\DeclareTextAccentDefault{\newtie}{TS1}
\DeclareTextAccentDefault{\capitalnewtie}{TS1}
%    \end{macrocode}
%    
% \changes{v1.9p}{1998/06/12}{Renamed \cs{textmacron} pr/2840}
%    \begin{macrocode}
\DeclareTextSymbolDefault{\textcapitalcompwordmark}{TS1}
\DeclareTextSymbolDefault{\textascendercompwordmark}{TS1}
\DeclareTextSymbolDefault{\textquotestraightbase}{TS1}
\DeclareTextSymbolDefault{\textquotestraightdblbase}{TS1}
\DeclareTextSymbolDefault{\texttwelveudash}{TS1}
\DeclareTextSymbolDefault{\textthreequartersemdash}{TS1}
\DeclareTextSymbolDefault{\textleftarrow}{TS1}
\DeclareTextSymbolDefault{\textrightarrow}{TS1}
\DeclareTextSymbolDefault{\textblank}{TS1}
\DeclareTextSymbolDefault{\textdollar}{TS1}
\DeclareTextSymbolDefault{\textquotesingle}{TS1}
\DeclareTextSymbolDefault{\textasteriskcentered}{TS1}
\DeclareTextSymbolDefault{\textdblhyphen}{TS1}
\DeclareTextSymbolDefault{\textfractionsolidus}{TS1}
\DeclareTextSymbolDefault{\textzerooldstyle}{TS1}
\DeclareTextSymbolDefault{\textoneoldstyle}{TS1}
\DeclareTextSymbolDefault{\texttwooldstyle}{TS1}
\DeclareTextSymbolDefault{\textthreeoldstyle}{TS1}
\DeclareTextSymbolDefault{\textfouroldstyle}{TS1}
\DeclareTextSymbolDefault{\textfiveoldstyle}{TS1}
\DeclareTextSymbolDefault{\textsixoldstyle}{TS1}
\DeclareTextSymbolDefault{\textsevenoldstyle}{TS1}
\DeclareTextSymbolDefault{\texteightoldstyle}{TS1}
\DeclareTextSymbolDefault{\textnineoldstyle}{TS1}
\DeclareTextSymbolDefault{\textlangle}{TS1}
\DeclareTextSymbolDefault{\textminus}{TS1}
\DeclareTextSymbolDefault{\textrangle}{TS1}
\DeclareTextSymbolDefault{\textmho}{TS1}
\DeclareTextSymbolDefault{\textbigcircle}{TS1}
\DeclareTextSymbolDefault{\textohm}{TS1}
\DeclareTextSymbolDefault{\textlbrackdbl}{TS1}
\DeclareTextSymbolDefault{\textrbrackdbl}{TS1}
\DeclareTextSymbolDefault{\textuparrow}{TS1}
\DeclareTextSymbolDefault{\textdownarrow}{TS1}
\DeclareTextSymbolDefault{\textasciigrave}{TS1}
\DeclareTextSymbolDefault{\textborn}{TS1}
\DeclareTextSymbolDefault{\textdivorced}{TS1}
\DeclareTextSymbolDefault{\textdied}{TS1}
\DeclareTextSymbolDefault{\textleaf}{TS1}
\DeclareTextSymbolDefault{\textmarried}{TS1}
\DeclareTextSymbolDefault{\textmusicalnote}{TS1}
\DeclareTextSymbolDefault{\texttildelow}{TS1}
\DeclareTextSymbolDefault{\textdblhyphenchar}{TS1}
\DeclareTextSymbolDefault{\textasciibreve}{TS1}
\DeclareTextSymbolDefault{\textasciicaron}{TS1}
\DeclareTextSymbolDefault{\textgravedbl}{TS1}
\DeclareTextSymbolDefault{\textacutedbl}{TS1}
\DeclareTextSymbolDefault{\textdagger}{TS1}
\DeclareTextSymbolDefault{\textdaggerdbl}{TS1}
\DeclareTextSymbolDefault{\textbardbl}{TS1}
\DeclareTextSymbolDefault{\textperthousand}{TS1}
\DeclareTextSymbolDefault{\textbullet}{TS1}
\DeclareTextSymbolDefault{\textcelsius}{TS1}
\DeclareTextSymbolDefault{\textdollaroldstyle}{TS1}
\DeclareTextSymbolDefault{\textcentoldstyle}{TS1}
\DeclareTextSymbolDefault{\textflorin}{TS1}
\DeclareTextSymbolDefault{\textcolonmonetary}{TS1}
\DeclareTextSymbolDefault{\textwon}{TS1}
\DeclareTextSymbolDefault{\textnaira}{TS1}
\DeclareTextSymbolDefault{\textguarani}{TS1}
\DeclareTextSymbolDefault{\textpeso}{TS1}
\DeclareTextSymbolDefault{\textlira}{TS1}
\DeclareTextSymbolDefault{\textrecipe}{TS1}
\DeclareTextSymbolDefault{\textinterrobang}{TS1}
\DeclareTextSymbolDefault{\textinterrobangdown}{TS1}
\DeclareTextSymbolDefault{\textdong}{TS1}
\DeclareTextSymbolDefault{\texttrademark}{TS1}
\DeclareTextSymbolDefault{\textpertenthousand}{TS1}
\DeclareTextSymbolDefault{\textpilcrow}{TS1}
\DeclareTextSymbolDefault{\textbaht}{TS1}
\DeclareTextSymbolDefault{\textnumero}{TS1}
\DeclareTextSymbolDefault{\textdiscount}{TS1}
\DeclareTextSymbolDefault{\textestimated}{TS1}
\DeclareTextSymbolDefault{\textopenbullet}{TS1}
\DeclareTextSymbolDefault{\textservicemark}{TS1}
\DeclareTextSymbolDefault{\textlquill}{TS1}
\DeclareTextSymbolDefault{\textrquill}{TS1}
\DeclareTextSymbolDefault{\textcent}{TS1}
\DeclareTextSymbolDefault{\textsterling}{TS1}
\DeclareTextSymbolDefault{\textcurrency}{TS1}
\DeclareTextSymbolDefault{\textyen}{TS1}
\DeclareTextSymbolDefault{\textbrokenbar}{TS1}
\DeclareTextSymbolDefault{\textsection}{TS1}
\DeclareTextSymbolDefault{\textasciidieresis}{TS1}
\DeclareTextSymbolDefault{\textcopyright}{TS1}
\DeclareTextSymbolDefault{\textordfeminine}{TS1}
\DeclareTextSymbolDefault{\textcopyleft}{TS1}
\DeclareTextSymbolDefault{\textlnot}{TS1}
\DeclareTextSymbolDefault{\textcircledP}{TS1}
\DeclareTextSymbolDefault{\textregistered}{TS1}
\DeclareTextSymbolDefault{\textasciimacron}{TS1}
\DeclareTextSymbolDefault{\textdegree}{TS1}
\DeclareTextSymbolDefault{\textpm}{TS1}
\DeclareTextSymbolDefault{\texttwosuperior}{TS1}
\DeclareTextSymbolDefault{\textthreesuperior}{TS1}
\DeclareTextSymbolDefault{\textasciiacute}{TS1}
\DeclareTextSymbolDefault{\textmu}{TS1}
\DeclareTextSymbolDefault{\textparagraph}{TS1}
\DeclareTextSymbolDefault{\textperiodcentered}{TS1}
\DeclareTextSymbolDefault{\textreferencemark}{TS1}
\DeclareTextSymbolDefault{\textonesuperior}{TS1}
\DeclareTextSymbolDefault{\textordmasculine}{TS1}
\DeclareTextSymbolDefault{\textsurd}{TS1}
\DeclareTextSymbolDefault{\textonequarter}{TS1}
\DeclareTextSymbolDefault{\textonehalf}{TS1}
\DeclareTextSymbolDefault{\textthreequarters}{TS1}
\DeclareTextSymbolDefault{\texteuro}{TS1}
\DeclareTextSymbolDefault{\texttimes}{TS1}
\DeclareTextSymbolDefault{\textdiv}{TS1}
%    \end{macrocode}
%    Finally input the encoding-specific definitions for
%    \texttt{TS1} thus making the top-level definitions
%    optimised for this encoding (and not for the default
%    encoding, see section~\ref{sec:orderofdecls}).
% \changes{v1.9o}{1998/03/20}{Load decls after defaults for speed.}
%    \begin{macrocode}
\input{ts1enc.def}
%    \end{macrocode}
%    Now having the new glyphs available we also want to make sure
%    that they are used. For most cases this will automatically happen
%    but for some glyphs there are inferior definitions already known
%    to \LaTeX{} which will prevent the usage of the \texttt{TS1}
%    versions (see section~\ref{sec:removeencspec} above). So we better
%    get rid of them:
% \changes{v1.9o}{1998/03/20}{Added various \cs{UndeclareTextCommand}
%    declarations for pr/2783}
%    \begin{macrocode}
\UndeclareTextCommand{\textsterling}{OT1}
\UndeclareTextCommand{\textdollar}  {OT1}
%    \end{macrocode}
%    Similar declarations should probably be made for other encodings
%    like \texttt{OT4} if they are in use.
%    \begin{macrocode}
%\UndeclareTextCommand{\textsterling}{OT4}
%\UndeclareTextCommand{\textdollar}  {OT4}
%    \end{macrocode}
%    From the \texttt{T1} encoding there are two candidates for removal:
%    \textperthousand{} and \textpertenthousand{} since these are both
%    constructed from \% followed by a tiny
%    `{\fontencoding{T1}\selectfont \char 24}'
%    rather than being a single glyph. The problem with this
%    approach is that in PostScript fonts this small zero is usually not
%    available resulting in \%\rule{3pt}{3pt} rather than
%    \textperthousand{} while the real glyph (at least for
%    |\textperthousand|) is available in the PostScript version of
%    \texttt{TS1}.  So for the moment we compromise by removing the
%    \texttt{T1} declaration for |\textperthousand| but keeping the one
%    for |\textpertenthousand|. This will have the effect that with
%    Computer Modern fonts everything will come out (although
%    \textperthousand{} and \textpertenthousand{} are not taken from the
%    same physical font) and with PostScript fonts \textperthousand{}
%    will come out correctly while \textpertenthousand{} will most
%    likely look like \%\rule{6pt}{3pt} --- which is probably an
%    improvement over just getting a single `\rule{3pt}{3pt}' to
%    indicate a completely missing glyph, which would happen if we
%    also `undeclared' |\textpertenthousand|.
%    \begin{macrocode}
\UndeclareTextCommand{\textperthousand}{T1}
%\UndeclareTextCommand{\textpertenthousand}{T1}
%</TS1sty>
%    \end{macrocode}
%
% \Finale
%
\endinput
