%% 
%%  A DANTE-Edition example
%% 
%%  Example 32-02-9 on page 657.
%% 
%%  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{201.70511pt}
\setlength\parindent{0pt}

\usepackage{uml}

\begin{document}
\umlDiagram[box=,sizeX=5cm,sizeY=5cm,ref=relation]{%
 \umlClass[pos=\umlBottomLeft{relation},posDelta={1,1},refpoint=bl,reference=A]{Class A}{}{}
 \umlClass[pos=\umlTopRight{relation},posDelta={-1,-1},refpoint=tr,reference=B]{Class B}{}{}
 \umlRelation{A}{B}{\umlLabelA{AB}{*}\umlLabelB{AB}{1}}
 \umlLabel[fraction=0.5,offset=0]{AB}{centre}
 \umlSubclass[ref=ABsub,angleA=0,armA=5,armAngleA=0,angleB=300,nodesep=1ex]{A}{B}
 \umlComposition[%
    reference=ABComp, % mark
    angleA=120,       % start at A
    arm=3,            % middle line
    armAngleA=80,     % angle of the arm A
    angleB=180,       % start at B
    armAngleB=190     % angle of the arm B
    ]{A}{B} % upper line
 \umlNavigabilityA{ABComp}}% arrow at A
\end{document}