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+% \iffalse meta-comment
+% ======================================================================
+% scrkernel-compatibility.dtx
+% Copyright (c) Markus Kohm, 2006-2022
+%
+% 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 3896 2022-06-21 09:06:07Z 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: 2022-06-21 11:06:07 +0200 (Di, 21. Jun 2022) $
+ \def\filerevision$#1: #2 ${\def\filerevision{r#2}}
+ \filerevision$Revision: 3896 $
+ \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}
+%
+% \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} or the English \file{scrguien}.
+%
+%
+% \MaybeStop{\PrintIndex}
+%
+%
+% \section{Implementation of Compatibility Selection}
+%
+% \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}}
+% 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}{%
+ \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}
+% There is also 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}
+% \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
+ You should 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}
+% \begin{macro}{\scr@v@first}
+% \changes{v2.9u}{2005/03/05}{added}
+% \begin{macro}{\scr@v@2.9}
+% \changes{v2.9u}{2005/03/05}{added}
+% \begin{macro}{\scr@v@2.9t}
+% \changes{v2.9u}{2005/03/05}{added}
+% \begin{macro}{\scr@v@2.95}
+% \changes{v2.95}{2006/03/23}{added}
+% \begin{macro}{\scr@v@2.95a}
+% \changes{v2.96a}{2006/11/27}{added}
+% \begin{macro}{\scr@v@2.95b}
+% \changes{v2.96a}{2006/11/27}{added}
+% \begin{macro}{\scr@v@2.96}
+% \changes{v2.96a}{2006/11/27}{added}
+% \begin{macro}{\scr@v@2.96a}
+% \changes{v2.96a}{2006/11/27}{added}
+% \begin{macro}{\scr@v@2.97}
+% \changes{v2.97}{2007/03/02}{added}
+% \begin{macro}{\scr@v@2.97a}
+% \changes{v2.97a}{2007/03/07}{added}
+% \begin{macro}{\scr@v@2.97b}
+% \changes{v2.97b}{2007/03/25}{added}
+% \begin{macro}{\scr@v@2.97c}
+% \changes{v2.97c}{2007/05/12}{added}
+% \changes{v2.97d}{2007/10/09}{Wert geändert}%^^A
+% \begin{macro}{\scr@v@2.97d}
+% \changes{v2.97d}{2007/10/03}{added}
+% \changes{v2.97d}{2007/10/09}{Wert geändert}%^^A
+% \begin{macro}{\scr@v@2.97e}
+% \changes{v2.97e}{2007/11/27}{added}
+% \begin{macro}{\scr@v@2.98}
+% \changes{v2.98}{2007/12/24}{added}
+% \begin{macro}{\scr@v@2.98a}
+% \changes{v2.98a}{2008/01/08}{added}
+% \begin{macro}{\scr@v@2.98b}
+% \changes{v2.98b}{2008/01/30}{added}
+% \begin{macro}{\scr@v@2.98c}
+% \changes{v2.98c}{2008/02/01}{added}
+% \begin{macro}{\scr@v@3.00}
+% \changes{v3.00}{2008/11/04}{added}
+% \begin{macro}{\scr@v@3.01}
+% \changes{v3.01}{2008/11/14}{added}
+% \begin{macro}{\scr@v@3.01a}
+% \changes{v3.01a}{2008/11/20}{added}
+% \begin{macro}{\scr@v@3.01b}
+% \changes{v3.01b}{2008/11/24}{added}
+% \begin{macro}{\scr@v@3.01c}
+% \changes{v3.01c}{2008/12/09}{added}
+% \begin{macro}{\scr@v@3.02}
+% \changes{v3.02}{2009/01/01}{added}
+% \begin{macro}{\scr@v@3.02b}
+% \changes{v3.02b}{2009/01/24}{added}
+% \begin{macro}{\scr@v@3.02c}
+% \changes{v3.02c}{2009/01/28}{added}
+% \begin{macro}{\scr@v@3.03}
+% \changes{v3.03}{2009/04/01}{added}
+% \begin{macro}{\scr@v@3.03a}
+% \changes{v3.03a}{2009/04/02}{added}
+% \begin{macro}{\scr@v@3.03b}
+% \changes{v3.03b}{2009/04/12}{added}
+% \begin{macro}{\scr@v@3.04}
+% \changes{v3.04}{2009/07/07}{added}
+% \begin{macro}{\scr@v@3.05}
+% \changes{v3.05}{2009/07/08}{added}
+% \begin{macro}{\scr@v@3.04a}
+% \changes{v3.04a}{2009/07/24}{added}
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+% \changes{v3.05a}{2010/03/10}{added}
+% \begin{macro}{\scr@v@3.06}
+% \changes{v3.06}{2010/06/17}{added}
+% \begin{macro}{\scr@v@3.07}
+% \changes{v3.07}{2010/09/14}{added}
+% \begin{macro}{\scr@v@3.08}
+% \changes{v3.08}{2010/10/28}{added}
+% \begin{macro}{\scr@v@3.08a}
+% \changes{v3.08a}{2011/01/25}{added}
+% \begin{macro}{\scr@v@3.08b}
+% \changes{v3.08b}{2011/02/22}{added}
+% \begin{macro}{\scr@v@3.09}
+% \changes{v3.09}{2011/04/02}{added}
+% \begin{macro}{\scr@v@3.09a}
+% \changes{v3.09a}{2011/04/12}{added}
+% \begin{macro}{\scr@v@3.10}
+% \changes{v3.10}{2011/08/30}{added}
+% \begin{macro}{\scr@v@3.10a}
+% \changes{v3.10a}{2012/03/08}{added}
+% \begin{macro}{\scr@v@3.10b}
+% \changes{v3.10b}{2012/03/13}{added}
+% \begin{macro}{\scr@v@3.11}
+% \changes{v3.11}{2012/05/15}{added}
+% \begin{macro}{\scr@v@3.11a}
+% \changes{v3.11a}{2012/05/25}{added}
+% \begin{macro}{\scr@v@3.11b}
+% \changes{v3.11b}{2012/07/29}{added}
+% \begin{macro}{\scr@v@3.12}
+% \changes{v3.12}{2013/03/05}{added}
+% \begin{macro}{\scr@v@3.13}
+% \changes{v3.13}{2014/03/19}{added}
+% \begin{macro}{\scr@v@3.13a}
+% \changes{v3.13a}{2014/08/07}{added}
+% \begin{macro}{\scr@v@3.14}
+% \changes{v3.14}{2014/10/28}{added}
+% \begin{macro}{\scr@v@3.15}
+% \changes{v3.15}{2014/11/20}{added}
+% \begin{macro}{\scr@v@3.16}
+% \changes{v3.16}{2015/02/08}{added}
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+% \changes{v3.17}{2015/02/08}{added}
+% \begin{macro}{\scr@v@3.17a}
+% \changes{v3.17a}{2015/05/06}{added}
+% \begin{macro}{\scr@v@3.17c}
+% \changes{v3.17c}{2015/05/13}{added}
+% \begin{macro}{\scr@v@3.18}
+% \changes{v3.18}{2015/05/14}{added}
+% \begin{macro}{\scr@v@3.18a}
+% \changes{v3.18a}{2015/07/03}{added}
+% \begin{macro}{\scr@v@3.19}
+% \changes{v3.19}{2015/07/26}{added}
+% \begin{macro}{\scr@v@3.19a}
+% \changes{v3.19a}{2015/10/03}{added}
+% \begin{macro}{\scr@v@3.20}
+% \changes{v3.20}{2015/10/06}{added}
+% \begin{macro}{\scr@v@3.21}
+% \changes{v3.21}{2016/05/19}{added}
+% \begin{macro}{\scr@v@3.22}
+% \changes{v3.22}{2016/07/29}{added}
+% \begin{macro}{\scr@v@3.23}
+% \changes{v3.23}{2017/02/04}{added}
+% \begin{macro}{\scr@v@3.23}
+% \changes{v3.24}{2017/04/22}{added}
+% \begin{macro}{\scr@v@3.25}
+% \changes{v3.25}{2017/09/07}{added}
+% \begin{macro}{\scr@v@3.26}
+% \changes{v3.26}{2018/03/31}{added}
+% \begin{macro}{\scr@v@3.26a}
+% \changes{v3.26a}{2018/12/30}{added}
+% \begin{macro}{\scr@v@3.26b}
+% \changes{v3.26b}{2018/12/30}{added}
+% \begin{macro}{\scr@v@3.27}
+% \changes{v3.27}{2019/02/02}{added}
+% \begin{macro}{\scr@v@3.27a}
+% \changes{v3.27a}{2019/10/13}{added}
+% \begin{macro}{\scr@v@3.28}
+% \changes{v3.28}{2019/11/20}{added}
+% \begin{macro}{\scr@v@3.29}
+% \changes{v3.29}{2020/01/06}{added}
+% \begin{macro}{\scr@v@3.30}
+% \changes{v3.30}{2020/02/24}{added}
+% \begin{macro}{\scr@v@3.31}
+% \changes{v3.31}{2020/04/26}{added}
+% \begin{macro}{\scr@v@3.32}
+% \changes{v3.32}{2020/08/06}{added}
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+% \changes{v3.33}{2021/01/01}{added}
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+% \changes{v3.37 BETA}{2022/05/04}{added}
+% \begin{macro}{\scr@v@last}
+% \changes{v2.9u}{2005/03/05}{added}
+% Nun die unterschiedlichen möglichen Werte (|\scr@v@last| ist jeweils die
+% höchste vorhandene Nummer):
+% \begin{macrocode}
+\@namedef{scr@v@first}{0}
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+\@namedef{scr@v@3.22}{16}
+\@namedef{scr@v@3.23}{16}
+\@namedef{scr@v@3.24}{16}
+\@namedef{scr@v@3.25}{17}
+\@namedef{scr@v@3.26}{17}
+\@namedef{scr@v@3.26a}{17}
+\@namedef{scr@v@3.26b}{17}
+\@namedef{scr@v@3.27}{17}
+\@namedef{scr@v@3.27a}{17}
+\@namedef{scr@v@3.28}{17}
+\@namedef{scr@v@3.29}{17}
+\@namedef{scr@v@3.30}{17}
+\@namedef{scr@v@3.31}{18}
+\@namedef{scr@v@3.32}{18}
+\@namedef{scr@v@3.33}{18}
+\@namedef{scr@v@3.34}{18}
+\@namedef{scr@v@3.35}{19}
+\@namedef{scr@v@3.36}{20}
+\@namedef{scr@v@3.37 BETA}{20}
+\@namedef{scr@v@last}{20}
+% \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{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@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}
+%
+% \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://komascript.de/current>%
+ }%
+ }%
+ }%
+ \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}
+%<*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>
+% \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: