% \iffalse meta-comment
% ======================================================================
% scrkernel-compatibility.dtx
% Copyright (c) Markus Kohm, 2006-2025
%
% This file is part of the LaTeX2e KOMA-Script bundle.
%
% This work may be distributed and/or modified under the conditions of
% the LaTeX Project Public License, version 1.3c of the license.
% The latest version of this license is in
%   http://www.latex-project.org/lppl.txt
% and version 1.3c or later is part of all distributions of LaTeX 
% version 2005/12/01 or later and of this work.
%
% This work has the LPPL maintenance status "author-maintained".
%
% The Current Maintainer and author of this work is Markus Kohm.
%
% This work consists of all files listed in MANIFEST.md.
% ======================================================================
%%% From File: $Id: scrkernel-compatibility.dtx 4224 2025-09-11 12:26:42Z kohm $
%<identify>%%%            (run: identify)
%<init>%%%            (run: init)
%<option>%%%            (run: option)
%<body>%%%            (run: body)
%<*dtx>
\ifx\ProvidesFile\undefined\def\ProvidesFile#1[#2]{}\fi
\begingroup
  \def\filedate$#1: #2-#3-#4 #5${\def\filedate{#2/#3/#4}}
  \filedate$Date: 2025-09-11 14:26:42 +0200 (Do, 11. Sep 2025) $
  \def\filerevision$#1: #2 ${\def\filerevision{r#2}}
  \filerevision$Revision: 4224 $
  \edef\reserved@a{%
    \noexpand\endgroup
    \noexpand\ProvidesFile{scrkernel-compatibility.dtx}%
                          [\filedate\space\filerevision\space
                           KOMA-Script source
                           (compatibility)]
  }%
\reserved@a
\documentclass[USenglish]{koma-script-source-doc}
\usepackage{babel}
\usepackage{hvlogos}
\setcounter{StandardModuleDepth}{2}
\begin{document}
\DocInput{scrkernel-compatibility.dtx}
\end{document}
%</dtx>
% \fi^^A meta-comment
%
% \changes{v2.95}{2006/03/16}{new by splitting \file{scrclass.dtx}}
% \changes{v3.36}{2022/02/21}{switch over from \cls*{scrdoc} to
%   \cls*{koma-script-source-doc}}
% \changes{v3.36}{2022/02/21}{whole implementation documentation in English}
% \changes{v3.40}{2023/04/17}{guide names changed}
%
% \GetFileInfo{scrkernel-compatibility.dtx}
% \title{Compatibility with prior Versions of
%   \href{https://komascript.de}{\KOMAScript}}
% \author{\href{mailto:komascript@gmx.info}{Markus Kohm}}
% \date{Revision \fileversion{} of \filedate}
% \maketitle
% \begin{abstract}
%   \KOMAScript{} has been designed to be as much compatible with the user
%   interface of the standard classes as possible. Compatibility with internal
%   commands of the standard classes is not possible and therefore sometimes
%   given, but mostly not. Compatibility with the lookalike of the standard
%   classes is not a main purpose of \KOMAScript{}, however with option
%   \opt{emulatestandardclasses} several layout elements can be changed to
%   look similar to the standard classes.
%
%   Another compatibility topic is compatibility of \KOMAScript{} to prior
%   version of \KOMAScript. Sometimes, \KOMAScript{} has been changed to
%   improve the typography. In most of these cases you can switch back to the
%   results of prior versions with option \opt{version}.
%
%   All those features are implemented in \file{scrkernel-compatibility.dtx}.
% \end{abstract}
% \tableofcontents
%
% \section{User Manual}
%
% You can find the user documentation of the commands implemented in
% \file{scrkernel-compatibility.dtx} in the \KOMAScript{} manual, either the
% German \file{scrguide-de.pdf} or the English \file{scrguide-en.pdf}.
% 
%
% \MaybeStop{\PrintIndex}
%
%
% \section{Implementation of Compatibility Selection}
%
% \changes{v3.99}{2022/10/25}{begin of less compatibility of \KOMAScript~4}
% For \KOMAScript{} before version 4 there are a lot of compatibility
% settings. However, testing of all those are almost impossible and with all
% those new features of new \LaTeX{} kernels it will become harder and
% harder. So from \KOMAScript~4, compatibility to prior versions will be
% reduced a lot. If users need such compatibility, they should use older
% releases. However, for some time, at least before the first official release
% of \KOMAScript~4, conditionally the sources support generation of a
% \KOMAScript~3 compatible version or alternatively of a \KOMAScript~4
% compatible version.
%
% \subsection{Options for compatibility with the standard classes}
% There is only one such option, which can only be used while loading a
% \KOMAScript{} class.
%
% \begin{option}{emulatestandardclasses}
% \changes{v3.12}{2013/11/11}{added}
% \changes{v3.20}{2016/02/16}{\opt{headings\quotechar=standardclasses} also
%   for \cls*{scrartcl}}
% \changes{v3.44}{2025/03/13}{warning added}
% Because this option has to change several defaults, it should be used as
% early as possible. The earliest time is the load time. So it has been
% defined as a classic option.
% \begin{macro}{\@scr@emulatestandardclassesfalse,\@scr@emulatestandardclassestrue,
%               \if@scr@emulatestandardclasses}
% \changes{v3.12}{2013/11/11}{added}
% We need a boolean switch, but it should be a kind of constant, so the
% default changing macros are deactivated.
%    \begin{macrocode}
%<*option&class&!letter>
\newif\if@scr@emulatestandardclasses
\let\scr@emulatestandardclassestrue\relax
\let\scr@emulatestandardclassesfalse\relax
\DeclareOption{emulatestandardclasses}{%
  \ClassWarningNoLine{\KOMAClassName}{%
    The use of the undocumented and therefore unofficial\MessageBreak
    and highly experimental option `emulatestandardclasses'\MessageBreak
    leads to restrictions in support. In particular, it is\MessageBreak
    to be expected that the function of the option will\MessageBreak
    change at any time or that the option will be removed\MessageBreak
    from the \KOMAClassName\space class.%
  }%
  \let\if@scr@emulatestandardclasses\iftrue
  \KOMAExecuteOptions{%
    fontsize=10pt,%
%<article|book|report>    headings=standardclasses,%
    cleardoublepage=current
  }%
  \newcommand*{\defaultpapersize}{letter}%
  \AtEndOfClass{%
    \setkomafont{descriptionlabel}{\bfseries}%
    \setkomafont{dictum}{\normalfont\small}%
    \setkomafont{caption}{}%
    \setkomafont{captionlabel}{}%
    \setcapindent{0pt}%
    \RequirePackage[pagestyleset=standard,markcase=upper]{scrlayer-scrpage}%
    \PreventPackageFromLoading{scrpage2}%
    \setkomafont{pagenumber}{\normalfont}%
    \setkomafont{pageheadfoot}{\normalfont}%
    \cfoot[\pagemark]{}%
%<article|report>    \pagestyle{plain}%
  }%
}
%</option&class&!letter>
%    \end{macrocode}
% \end{macro}
% \end{option}
%
%
% \subsection{Options for compatibility with prior versions of \KOMAScript}
%
% \changes{v3.99}{2022/10/25}{\KOMAScript~3 only}
% All features of this section are limited to \KOMAScript~3. \KOMAScript~4
% will not implement it.
%    \begin{macrocode}
%<*!v4>
%    \end{macrocode}
%
% For \KOMAScript~3 there is a single option to select compatibility with
% exactly one \KOMAScript{} version. The compatibility changes are limited to
% feature changes. Bug changes are not affected. So you would never be able to
% get exactly the result of the given version using this option. However
% falling back to compatibility with a prior version usually also deactivates
% other features of the current version.
%
% \changes{v3.01b}{2008/12/09}{compatibility definitions in packages only, if
% not yet defined}
%
% \begin{option}{version}
% \changes{v2.9u}{2005/03/05}{added}
% \changes{v2.95}{2006/03/16}{can be used while loading only}
% \changes{v3.39}{2022/11/11}{initial dot removed from member argument of
%   option storage commands}
% \begin{macro}{\scr@compatibility}
% \changes{v2.9u}{2005/03/05}{added}
% \changes{v3.01a}{2008/11/20}{default is \opt{\quotechar=last}}
% \begin{macro}{\scr@ta@compatibility}
% \changes{v3.01b}{2008/12/09}{added}
% Depending on \opt{version=\meta{version}} \cs{scr@compatibility}
% resp. \cs{scr@ta@compatibility} will be set to an integer. The mapping from
% \meta{version} to the integer is done with several macros
% \cs{scr@v@\meta{version}}.
%    \begin{macrocode}
%<*init>
%<class>\newcommand*
%<package>\providecommand*
  {\scr@compatibility}{\scr@v@last}
%<typearea>\newcommand*{\scr@ta@compatibility}{\scr@compatibility}
%</init>
%<*option>
\KOMA@key{version}[last]{%
  \scr@ifundefinedorrelax{scr@v@#1}{%
    \def\scr@compatibility{0}%
%<class>    \ClassWarningNoLine{\KOMAClassName}{%
%<*package>
    \PackageWarningNoLine{%
%<extend>      scrextend%
%<typearea>      typearea%
%<letter>      scrletter%
    }{%
%</package>
      You have set option `version' to value `#1', but\MessageBreak
      this value of version is not supported.\MessageBreak
      Because of this, version was set to `first'%
    }%
    \FamilyKeyStateProcessed
    \KOMA@kav@replacevalue{%
%<class>      \KOMAClassFileName
%<package&extend>      scrextend.\scr@pkgextension
%<package&typearea>      typearea.\scr@pkgextension
%<package&letter>      scrletter.\scr@pkgextension
    }{version}{first}%
  }{%
%<class>    \ClassInfoNoLine{\KOMAClassName}{%
%<*package>
    \PackageInfoNoLine{%
%<extend>      scrextend%
%<typearea>      typearea%
%<letter>      scrletter%
    }{%
%</package>
      Switching compatibility level to `#1'%
    }%
%<class|extend|letter> \edef\scr@compatibility{\@nameuse{scr@v@#1}}%
%<typearea>    \edef\scr@ta@compatibility{\@nameuse{scr@v@#1}}%
    \FamilyKeyStateProcessed
    \KOMA@kav@xreplacevalue{%
%<class>      \KOMAClassFileName
%<package&extend>      scrextend.\scr@pkgextension
%<package&typearea>      typearea.\scr@pkgextension
%<package&letter>      scrletter.\scr@pkgextension
    }{version}{#1}%
    \ifnum\scr@compatibility<\scr@v@last
%<class>      \ClassWarningNoLine{\KOMAClassName}{%
%<*package>
      \PackageWarningNoLine{%
%<extend>        scrextend%
%<typearea>        typearea%
%<letter>        scrletter%
      }{%
%</package>
        Switching back to an old KOMA-Script release does\MessageBreak
        not mean, that KOMA-Script is fully compatible with\MessageBreak
        the old release. If you need full compatibility\MessageBreak
        to an old KOMA-Script release, you should use that\MessageBreak
        old KOMA-Script release. However, in that case you\MessageBreak
        could also need old releases of other packages and\MessageBreak
        even of the LaTeX kernel.\MessageBreak
        Please also note, that the KOMA-Script developers\MessageBreak
        refuse support for documents using `version=#1'.\MessageBreak
        We recommend to eliminate all deprecated options\MessageBreak
        and commands. We also recommend to not use option\MessageBreak
        `version', i.e., with other values than `last'%
      }%    
    \fi
  }%
}
%<class>\KOMA@kav@add{\KOMAClassFileName}{version}{last}
%    \end{macrocode} 
% We do not use \cs{FamilyKeyState} if the option is set to late, but
% immediately report an error.
%    \begin{macrocode}
%<class>\AtEndOfClass{%
%<package>\AtEndOfPackage{%
  \KOMA@key{version}[]{%
%<class>    \ClassError{\KOMAClassName}{%
%<*package>
    \PackageError{%
%<extend>      scrextend%
%<typearea>      typearea%
%<letter>      scrletter%
    }{%
%</package>
      Option `version' too late%
    }{%
      Option `version' may be set only while loading the 
%<class>      class.\MessageBreak
%<package>      package.\MessageBreak
      But you've tried to set it up later.%
    }%
    \FamilyKeyStateProcessed
  }%
}
%</option>
%    \end{macrocode}
%
%    \begin{macrocode}
%<*init>
%    \end{macrocode}
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% \begin{macro}{\scr@v@3.30}
% \changes{v3.30}{2020/02/24}{added}
% \changes{v3.45}{2025/06/04}{value changed}
% \begin{macro}{\scr@v@3.31}
% \changes{v3.31}{2020/04/26}{added}
% \changes{v3.45}{2025/06/04}{value changed}
% \begin{macro}{\scr@v@3.32}
% \changes{v3.32}{2020/08/06}{added}
% \changes{v3.45}{2025/06/04}{value changed}
% \begin{macro}{\scr@v@3.33}
% \changes{v3.33}{2021/01/01}{added}
% \changes{v3.45}{2025/06/04}{value changed}
% \begin{macro}{\scr@v@3.34}
% \changes{v3.34}{2021/03/22}{added}
% \changes{v3.45}{2025/06/04}{value changed}
% \begin{macro}{\scr@v@3.35}
% \changes{v3.35}{2021/10/12}{added}
% \changes{v3.45}{2025/06/04}{value changed}
% \begin{macro}{\scr@v@3.36}
% \changes{v3.36}{2021/11/17}{added}
% \changes{v3.45}{2025/06/04}{value changed}
% \begin{macro}{\scr@v@3.37}
% \changes{v3.37}{2022/05/04}{added}
% \changes{v3.45}{2025/06/04}{value changed}
% \begin{macro}{\scr@v@3.38}
% \changes{v3.38}{2022/07/06}{added}
% \changes{v3.45}{2025/06/04}{value changed}
% \begin{macro}{\scr@v@3.39}
% \changes{v3.39}{2022/10/13}{added}
% \changes{v3.45}{2025/06/04}{value changed}
% \begin{macro}{\scr@v@3.40}
% \changes{v3.40}{2023/04/17}{added}
% \changes{v3.45}{2025/06/04}{value changed}
% \begin{macro}{\scr@v@3.41}
% \changes{v3.41}{2023/04/24}{added}
% \changes{v3.45}{2025/06/04}{value changed}
% \begin{macro}{\scr@v@3.42}
% \changes{v3.42}{2023/07/13}{added}
% \changes{v3.45}{2025/06/04}{value changed}
% \begin{macro}{\scr@v@3.43}
% \changes{v3.43}{2024/10/22}{added}
% \begin{macro}{\scr@v@3.44}
% \changes{v3.44}{2024//11/27}{added}
% \begin{macro}{\scr@v@3.45}
% \changes{v3.45}{2025/06/04}{added}
% \begin{macro}{\scr@v@3.46}
% \changes{v3.46}{2025/06/05}{added}
% \begin{macro}{\scr@v@3.47}
% \changes{v3.47}{2025/08/28}{added}
% \begin{macro}{\scr@v@3.48}
% \changes{v3.48}{2025/08/28}{added}
% \begin{macro}{\scr@v@3.49}
% \changes{v3.49}{2025/09/11}{added}
% \begin{macro}{\scr@v@last}
% \changes{v2.9u}{2005/03/05}{added}
%    \begin{macrocode}
\@namedef{scr@v@first}{29000}
\@namedef{scr@v@2.9}{29000}
\@namedef{scr@v@2.9t}{29019}
\@namedef{scr@v@2.9u}{29020}
\@namedef{scr@v@2.95}{29500}
\@namedef{scr@v@2.95a}{29501}
\@namedef{scr@v@2.95b}{29502}
\@namedef{scr@v@2.96}{29600}
\@namedef{scr@v@2.96a}{29601}
\@namedef{scr@v@2.97}{29700}
\@namedef{scr@v@2.97a}{29701}
\@namedef{scr@v@2.97b}{29702}
\@namedef{scr@v@2.97c}{29703}
\@namedef{scr@v@2.97d}{29704}
\@namedef{scr@v@2.97e}{29705}
\@namedef{scr@v@2.98}{29800}
\@namedef{scr@v@2.98a}{29801}
\@namedef{scr@v@2.98b}{29802}
\@namedef{scr@v@2.98c}{29803}
\@namedef{scr@v@3.00}{30000}
\@namedef{scr@v@3.01}{30100}
\@namedef{scr@v@3.01a}{30101}
\@namedef{scr@v@3.01b}{30102}
\@namedef{scr@v@3.01c}{30103}
\@namedef{scr@v@3.02}{30200}
\@namedef{scr@v@3.02b}{30202}
\@namedef{scr@v@3.02c}{30203}
\@namedef{scr@v@3.03}{30300}
\@namedef{scr@v@3.03a}{30301}
\@namedef{scr@v@3.03b}{30302}
\@namedef{scr@v@3.04}{30400}
\@namedef{scr@v@3.04a}{30401}
\@namedef{scr@v@3.05}{30500}
\@namedef{scr@v@3.05a}{30501}
\@namedef{scr@v@3.06}{30600}
\@namedef{scr@v@3.07}{30700}
\@namedef{scr@v@3.08}{30800}
\@namedef{scr@v@3.08a}{30801}
\@namedef{scr@v@3.08b}{30802}
\@namedef{scr@v@3.09}{30900}
\@namedef{scr@v@3.09a}{30901}
\@namedef{scr@v@3.10}{31000}
\@namedef{scr@v@3.10a}{31001}
\@namedef{scr@v@3.10b}{31002}
\@namedef{scr@v@3.11}{31100}
\@namedef{scr@v@3.11a}{31101}
\@namedef{scr@v@3.11b}{31102}
\@namedef{scr@v@3.12}{31200}
\@namedef{scr@v@3.13}{31300}
\@namedef{scr@v@3.13a}{31301}
\@namedef{scr@v@3.14}{31400}
\@namedef{scr@v@3.15}{31500}
\@namedef{scr@v@3.16}{31600}
\@namedef{scr@v@3.17}{31700}
\@namedef{scr@v@3.17a}{31701}
\@namedef{scr@v@3.17c}{31703}
\@namedef{scr@v@3.18}{31800}
\@namedef{scr@v@3.18a}{31801}
\@namedef{scr@v@3.19}{31900}
\@namedef{scr@v@3.19a}{31901}
\@namedef{scr@v@3.20}{32000}
\@namedef{scr@v@3.21}{32100}
\@namedef{scr@v@3.22}{32200}
\@namedef{scr@v@3.23}{32300}
\@namedef{scr@v@3.24}{32400}
\@namedef{scr@v@3.25}{32500}
\@namedef{scr@v@3.26}{32600}
\@namedef{scr@v@3.26a}{32601}
\@namedef{scr@v@3.26b}{32602}
\@namedef{scr@v@3.27}{32700}
\@namedef{scr@v@3.27a}{32701}
\@namedef{scr@v@3.28}{32800}
\@namedef{scr@v@3.29}{32900}
\@namedef{scr@v@3.30}{33300}
\@namedef{scr@v@3.31}{33100}
\@namedef{scr@v@3.32}{33200}
\@namedef{scr@v@3.33}{33300}
\@namedef{scr@v@3.34}{33400}
\@namedef{scr@v@3.35}{33500}
\@namedef{scr@v@3.36}{33600}
\@namedef{scr@v@3.37}{33700}
\@namedef{scr@v@3.38}{33800}
\@namedef{scr@v@3.39}{33900}
\@namedef{scr@v@3.40}{34000}
\@namedef{scr@v@3.41}{34100}
\@namedef{scr@v@3.42}{34200}
\@namedef{scr@v@3.43}{34300}
\@namedef{scr@v@3.44}{34400}
\@namedef{scr@v@3.45}{34500}
\@namedef{scr@v@3.46}{34600}
\@namedef{scr@v@3.47}{34700}
\@namedef{scr@v@3.48}{34800}
\@namedef{scr@v@3.49}{34900}
\@namedef{scr@v@last}{34900}
%    \end{macrocode}
% \end{macro}
% \end{macro}
% \end{macro}
% \end{macro}
% \end{macro}
% \end{macro}
% \end{macro}
% \end{macro}
% \end{macro}
% \end{macro}
% \end{macro}
% \end{macro}
% \end{macro}
% \end{macro}
% \end{macro}
% \end{macro}
% \end{macro}
% \end{macro}
% \end{macro}
% \end{macro}
% \end{macro}
% \end{macro}
% \end{macro}
% \end{macro}
% \end{macro}
% \end{macro}
% \end{macro}
% \end{macro}
% \end{macro}
% \end{macro}
% \end{macro}
% \end{macro}
% \end{macro}
% \end{macro}
% \end{macro}
% \end{macro}
% \end{macro}
% \end{macro}
% \end{macro}
% \end{macro}
% \end{macro}
% \end{macro}
% \end{macro}
% \end{macro}
% \end{macro}
% \end{macro}
% \end{macro}
% \end{macro}
% \end{macro}
% \end{macro}
% \end{macro}
% \end{macro}
% \end{macro}
% \end{macro}
% \end{macro}
% \end{macro}
% \end{macro}
% \end{macro}
% \end{macro}
% \end{macro}
% \end{macro}
% \end{macro}
% \end{macro}
% \end{macro}
% \end{macro}
% \end{macro}
% \end{macro}
% \end{macro}
% \end{macro}
% \end{macro}
% \end{macro}
% \end{macro}
% \end{macro}
% \end{macro}
% \end{macro}
% \end{macro}
% \end{macro}
% \end{macro}
% \end{macro}
% \end{macro}
% \end{macro}
% \end{macro}
% \end{macro}
% \end{macro}
% \end{macro}
% \end{macro}
% \end{macro}
% \end{macro}
% \end{macro}
% \end{macro}
% \end{macro}
% \end{macro}
% \end{macro}
% \end{macro}
% \end{macro}
% \end{option}
%    \begin{macrocode}
%</init>
%    \end{macrocode}
%
% \begin{macro}{\scr@v@is@lt,\scr@v@is@gt,\scr@v@is@le,\scr@v@is@ge}
% \changes{v3.17}{2015/03/10}{added}
% All these macros are to be used as condition for \cs{ifnum} and compare the
% currently selected version with a given \meta{version}, e.g.:
% \begin{quote}
%   \cs{expandafter}\cs{ifnum}\cs{scr@v@is@lt}\marg{version} \meta{true code}
%   \cs{else} \meta{false code} \cs{fi}
% \end{quote}
% The conditions are:
% \begin{quote}\raggedright
%   \cs{scr@v@is@lt} --- current version less than \meta{version} \\
%   \cs{scr@v@is@gt} --- current version greater than \meta{version} \\
%   \cs{scr@v@is@le} --- current version less than or equal to \meta{version} \\
%   \cs{scr@v@is@ge} --- current version greater than or equal to \meta{version} \\
% \end{quote}
%    \begin{macrocode}
%<*option&(class|extend)>
\newcommand*{\scr@v@is@lt}[1]{%
  \scr@compatibility<\@nameuse{scr@v@#1}
}
\newcommand*{\scr@v@is@gt}[1]{%
  \scr@compatibility>\@nameuse{scr@v@#1}
}
\newcommand*{\scr@v@is@le}[1]{%
  \numexpr\scr@compatibility-\@ne\relax<\@nameuse{scr@v@#1}
}
\newcommand*{\scr@v@is@ge}[1]{%
  \numexpr\scr@compatibility+\@ne\relax>\@nameuse{scr@v@#1}
}
%</option&(class|extend)>
%    \end{macrocode}
% \end{macro}
%
% \begin{macro}{\scr@v@is@eq}
% \changes{v3.39}{2022/10/25}{added}
% Similar to the above for equality test.
%    \begin{macrocode}
%<*option&(class|extend)>
\newcommand*{\scr@v@is@eq}[1]{%
  \scr@compatibility=\@nameuse{scr@v@#1}
}
%</option&(class|extend)>
%    \end{macrocode}
% \end{macro}
%
% \begin{macro}{\scr@ta@v@is@lt,\scr@ta@v@is@gt,\scr@ta@v@is@le,\scr@ta@v@is@ge}
% \changes{v3.17}{2015/03/10}{Neu (intern)}
% The same conditions are defined for \pkg*{typearea}.
%    \begin{macrocode}
%<*option&package&typearea>
\newcommand*{\scr@ta@v@is@lt}[1]{%
  \scr@ta@compatibility<\@nameuse{scr@v@#1}
}
\newcommand*{\scr@ta@v@is@gt}[1]{%
  \scr@ta@compatibility>\@nameuse{scr@v@#1}
}
\newcommand*{\scr@ta@v@is@le}[1]{%
  \numexpr\scr@ta@compatibility-\@ne <\@nameuse{scr@v@#1}
}
\newcommand*{\scr@ta@v@is@ge}[1]{%
  \numexpr\scr@ta@compatibility+\@ne >\@nameuse{scr@v@#1}
}
%</option&package&typearea>
%    \end{macrocode}
% \end{macro}
%
%    \begin{macrocode}
%</!v4>
%    \end{macrocode}
% 
% \subsection{Compatibility with used \LaTeX{} kernel version}
% \changes{v3.37}{2022/06/21}{version test added}
% We also do some version tests at |\begin{document}| because of the extremely
% high speed of \LaTeX{} kernel development.
%    \begin{macrocode}
%<*body&(class|extend)>
\AtBeginDocument{%
  \begingroup
    \def\reserved@a#1/#2/#3 #4\@nil{\@tempcnta=#1\relax\@tempcntb=#2\relax}%
    \expandafter\reserved@a\KOMAScriptVersion\@nil
    \edef\reserved@a{\the\numexpr\@tempcnta+2\relax/%
      \ifnum\@tempcntb<10 0\fi\the\@tempcntb/01}%
    \expandafter\IfLTXAtLeastTF\expandafter{\reserved@a}{%
%<class>      \ClassWarningNoLine{\KOMAClassName}{%
%<package>      \PackageWarningNoLine{scrextend}{%
        Your are using a KOMA-Script version, that has not\MessageBreak
        been tested with your more than one year newer\MessageBreak
        LaTeX release `\fmtversion'.\MessageBreak
        Because of the high speed of LaTeX kernel development,\MessageBreak
        this could result in a lot of issues.\MessageBreak
        Please have a look at\MessageBreak
        <http://www.ctan.org/pkg/koma-script> and if this\MessageBreak
        shows a newer KOMA-Script version than\MessageBreak
        `\KOMAScriptVersion', we suggest to do\MessageBreak
        an update of KOMA-Script or maybe even the whole\MessageBreak
        TeX distribution%
      }%
    }{%
      \edef\reserved@a{\the\numexpr\@tempcnta-4\relax/%
        \ifnum\@tempcntb<10 0\fi\the\@tempcntb/01}%
      \expandafter\IfLTXAtLeastTF\expandafter{\reserved@a}{}{%
%<class>        \ClassWarningNoLine{\KOMAClassName}{%
%<package>        \PackageWarningNoLine{scrextend}{%
          You are using a KOMA-Script version, that has not been\MessageBreak
          tested with your more than four years older LaTeX\MessageBreak
          release `\fmtversion'.\MessageBreak
          Because of the high speed of LaTeX kernel development,\MessageBreak
          KOMA-Script releases cannot be tested with all past\MessageBreak
          LaTeX releases.\MessageBreak
          \ifnum\scr@compatibility<\scr@v@last
            So even if you are using option `version' implicitly\MessageBreak
            or explicitly, this
          \else
            So this
          \fi
          could result in a lot of issues.\MessageBreak
          We recommend, to update the whole TeX distribution.\MessageBreak
          If this could not be done, we suggest to use at\MessageBreak
          least an older KOMA-Script release, e.g., from\MessageBreak
          <https://sf.net/projects/koma-script/files/KOMA-Script/>%
        }%
      }%
    }%
  \endgroup
}
%</body&(class|extend)>
%    \end{macrocode}
%
%
% \subsection{Compatibility with early versions of \cls*{scrlttr2}}
% Early version of \cls*{scrlttr2} have had another macro. Because, there may
% still be \file{lco} files, that use is, it is also defined if compatibility
% to version before 2.95 has been selected.
%
% \begin{macro}{\@setif}
% \changes{v2.8q}{2001/10/08}{added}
% \changes{v2.95}{2006/03/31}{only for version settings before 2.95}
% The deprecated command has been used to set a boolean switch to true or
% false using one of the values |true|, |false|, |on|, or |off|.
%    \begin{macrocode}
%<*!v4>
%<*class&letter&body>
\expandafter\ifnum \@nameuse{scr@v@2.95}>\scr@compatibility\relax
  \newcommand*{\@setif}[2][]{%
    \begingroup
      \edef\@tempa{#1}\ifx\@tempa\@empty
        \def\@tempa{\KOMA@set@ifkey{#2}{@#2}}%
      \else
        \def\@tempa{\KOMA@set@ifkey{#2}{#1}}%
      \fi
    \expandafter\endgroup\@tempa
  }%
\fi
%</class&letter&body>
%</!v4>
%    \end{macrocode}
% \end{macro}
%
% \Finale
% \PrintChanges
% 
\endinput
% Local Variables:
% mode: doctex
% ispell-local-dictionary: "en_US"
% eval: (flyspell-mode 1)
% TeX-master: t
% TeX-engine: luatex-dev
% eval: (setcar (or (cl-member "Index" (setq-local TeX-command-list (copy-alist TeX-command-list)) :key #'car :test #'string-equal) (setq-local TeX-command-list (cons nil TeX-command-list))) '("Index" "mkindex %s" TeX-run-index nil t :help "makeindex for dtx"))
% End:
