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+\documentclass{article}
+\usepackage{german}
+\newlength{\breite}
+\newcommand{\textbox}[2][xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx]%
+ {\settowidth{\breite}{#1}\framebox[\breite]{#2}}
+\begin{document}
+\noindent
+\textbox{ohne optionales Argument}\\
+\textbox[mit optionalem Argument]{mit opt. Argument}
+\end{document}