%% 
%%  Ein Beispiel der DANTE-Edition
%%  
%%  7. Auflage
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%%  Beispiel 31-01-22 auf Seite 687.
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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{145.16928pt}
\setlength\parindent{0pt}
%StartShownPreambleCommands
\usepackage{pst-uml}
%StopShownPreambleCommands
\begin{document}
\begin{pspicture}(5,4)
\rput(1,1.5){\rnode{A}{%
    \umlClass{Class1}{Eins\\Zwei}}}
\rput(4,3){\rnode{B}{%
    \umlClass{Class2}{Eins\\Zwei}}}
\end{pspicture}
\ncEDE[linewidth=1pt,linestyle=dotted]{A}{B}
\ncSXE[linewidth=1pt,linecolor=red]{A}{B}
\nbput[npos=0.5]{S}\nbput[npos=1.5]{\textbf{X}}
\nbput[npos=2.5]{X}\naput[npos=3.5]{\textbf{E}}
\end{document}