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+%%
+%% Die DANTE-Edition
+%% Ein Beispiel der LaTeX Referenz
+%% 3. Auflage
+%%
+%%
+%% Copyright (C) 2013 Herbert Voss
+%%
+%% It may be distributed and/or modified under the conditions
+%% of the LaTeX Project Public License, either version 1.3
+%% of this license or (at your option) any later version.
+%%
+%% See http://www.latex-project.org/lppl.txt for details.
+%%
+%%
+%% ====
+% Show page(s) 1
+%%
+%%
+\documentclass[]{exaarticle}
+\pagestyle{empty}
+\setlength\textwidth{352.81416pt}
+\setlength\parindent{0pt}
+%StartShownPreambleCommands
+\usepackage{filecontents}
+\begin{filecontents*}{l3keysdemo.sty}
+\NeedsTeXFormat{LaTeX2e}
+\RequirePackage{ l3keys2e, xparse }
+\ExplSyntaxOn% wegen \tl_ ..., sonst automatisch mit \ProvidesExplPackage
+\tl_new:N \l_keydemo_version
+\tl_set:Nn \l_keydemo_version{0.01}
+\ProvidesExplPackage {l3keysdemo} {2013/08/20}
+ {\l_keydemo_version} {2013/08/20 Key/Value Demo}
+\msg_set:nnn { keydemo } { version } { Version \l_keydemo_version }
+\bool_new:N \g_keydemo_tf_bool
+\bool_set_true:N \g_keydemo_tf_bool % Vorgabe ist true
+\bool_new:N \l_keydemo_printversion_bool
+\bool_set_false:N \l_keydemo_printversion_bool% Vorgabe ist false
+
+\keys_define:nn {keydemo}{% Paketoptionen
+ tf .bool_set:N = \g_keydemo_tf_bool,% global definiert
+ tf .default:n = false,% für tf ohne ANgabe
+ version .code:n = % TerminalAusgabe und im Dokument
+ {
+ \msg_warning:nn {keydemo} {version}
+ \bool_set_true:N \l_keydemo_printversion_bool
+ }
+}
+\ProcessKeysOptions{keydemo}
+\NewDocumentCommand\Test{}{ \bool_if:NTF \g_keydemo_tf_bool{wahr}{falsch} }
+\AtBeginDocument { Das~Paket~hat~die~Version~
+ \bool_if:NT \l_keydemo_printversion_bool { \l_keydemo_version } \par}
+\end{filecontents*}
+\usepackage[tf=true,version]{l3keysdemo}
+%StopShownPreambleCommands
+\begin{document}
+Die Option \texttt{tf} ist \Test!
+\end{document}