%% 
%%  Ein Beispiel der DANTE-Edition
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%%  7. Auflage
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%%  Beispiel 31-02-5 auf Seite 693.
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%%  Copyright (C) 2016 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
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\documentclass[]{exaarticle}
\pagestyle{empty}
\setlength\textwidth{121.16928pt}
\setlength\parindent{0pt}
%StartShownPreambleCommands
\usepackage{uml}
%StopShownPreambleCommands
\begin{document}
\umlDiagram[ref=Dia,sizeX=3cm,sizeY=2cm]{}
\umlBox[pos=\umlTop{Dia},refpoint=t]{\Large Box1}
\umlBox[pos=\umlRight{Dia},refpoint=rC]{\Large Box2}
\umlBox[pos=\umlLeft{Dia},refpoint=lC]{\Large Box3}
\umlBox[pos=\umlBottom{Dia},refpoint=b]{\Large Box4}
\end{document}