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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}
+\usepackage[ngerman]{babel}
+%StartShownPreambleCommands
+\usepackage{expl3,xparse} % expl3 lädt auch l3keys
+\ExplSyntaxOn % Da nicht automatisch aktiviert
+\cs_new:Npn \l_keydemo_Datum{}
+\keys_define:nn {keydemo}{ % Makrooptionen
+ Datum .code:n = \cs_set:Npn \l_keydemo_Datum{#1}, % lokal definiert
+ Datum .default:n = \today % für Datum ohne Angabe
+}
+\keys_set:nn { keydemo } { Datum=1.1.11 }
+\NewDocumentCommand\PrintDatum{}{ \l_keydemo_Datum }
+\NewDocumentCommand\Test{ om } % Keys per Anwendermakro
+ { \group_begin: % alles lokal halten
+ \keys_set:nn {keydemo} {#1}%
+ #2 \l_keydemo_Datum
+ \group_end:
+ }
+\NewDocumentCommand\keySetup { m } % Keys per Key-Makro
+ { \keys_set:nn { keydemo } { #1 } \tex_ignorespaces:D }
+\ExplSyntaxOff
+%StopShownPreambleCommands
+\begin{document}
+Das momentane Datum ist \PrintDatum. \par \Test[Datum]{Neues Datum: } \par
+\keySetup{Datum=tt.mm.YYYY} \PrintDatum
+\end{document}