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+% \iffalse meta-comment
+%
+% Part of Will Robertson's DTXGALLERY bundle, version 1.
+%
+%<*driver>
+\documentclass{ltxdoc}
+\usepackage{fancyvrb}
+\begin{document}
+  \DocInput{conditional-code.dtx}
+\end{document}
+%</driver>
+% \fi
+%
+% \section{Conditional inclusion of code}
+%
+% From previous examples the |%<*guard>|\dots|%</guard>| syntax should be a little familiar. This example demonstrates conditional extraction of such elements in the source document into multiple files. This technique makes it easy, say, to maintain a `debug' version of a package without polluting the public source with code for testing.
+%
+%    \begin{macrocode}
+%<A>  code in `A'
+%<B>  code in `B'
+%<!A>  code not in `A'
+%<!B>  code not in `B'
+%<A&B>  code in `A' and `B'
+%<A|B>  code in `A' or `B'
+%<(A|B)&!(A&B)>  code in `A' xor `B'
+%    \end{macrocode}
+% Note the change in the typeset source when guards are nested: \\
+% (this is equivalent to \verb|%<A&B>|)
+%    \begin{macrocode}
+%<*A>
+%<B>  `B' nested inside `A'
+%</A>
+%    \end{macrocode}
+% 
+% \section{Verbatim files that are produced}
+% \begin{minipage}{0.45\linewidth}
+% \subsection{Generated from `A'}
+% \VerbatimInput[frame=single]{A.txt}
+% \end{minipage}\hfill
+% \begin{minipage}{0.45\linewidth}
+% \subsection{Generated from `B'}
+% \VerbatimInput[frame=single]{B.txt}
+% \end{minipage}
+% \subsection{Generated from `A' and `B'}
+% \VerbatimInput[frame=single]{AB.txt}
+%
+% \Finale
+\endinput