%% 
%%  A DANTE-Edition example
%% 
%%  Example 32-02-8 on page 656.
%% 
%%  Copyright (C) 2010 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[]{article}
\pagestyle{empty}
\setlength\textwidth{153.70511pt}
\setlength\parindent{0pt}

\usepackage{uml}

\begin{document}
\umlSchema[box=]{Stack}{ %attributes
 \umlAttribute[visibility=-,type=\emph{type},
            default=null,]{firstNode}
 }{\umlMethod[visibility]{push}{\emph{type} x}% Methods
   \umlMethod[visibility,type=\emph{type}]{pop}{}
 }{\umlArgument[type=Metaclass]{type}% Arguments
 }{\umlCompartmentline{S:Stack = S.push(x).pop()}% Constraints
 }{\umlDiagram[innerBorder=2mm,sizeX=11em,% Structure
    sizeY=5em,ref=StackDiagram,outerBorder=2mm]{%
     \umlClass[pos={.5,.5}, ref=stackNode]{Node}{
      \umlAttribute[visibility=\#,type=\emph{type}]{data}}{}
     \umlRelation[angleA=20,angleB=-20,armA=1em,
                  armB=1em]{stackNode}{stackNode}{%
      \umlLabelA[height=-1ex,fraction=1.5]{stackNode}{1}
      \umlLabelB[height=-5ex,fraction=1.5]{stackNode}{1}}
    }% End of diagram
  }% End of Structure/Stack
\end{document}