%\begin{tikzpicture}[scale=0.7,transform shape]
\begin{tikzpicture}[scale=1,transform shape]

  \begin{class}{Trace}{-5.5,0}
    \attribute{transfoName : String}
  \end{class}
  
  \begin{class}{ReferenceClass}{0,0}
    \attribute{definitionName : String}
  \end{class}
 
  \begin{class}{SourceElement}{5.0,1}
    \attribute{}
  \end{class}
 
  \begin{class}{TargetElement}{5.0,-1}
    \attribute{}
  \end{class}
  
%  \begin{class}{Element}{4.5,0}
%    \attribute{}
%  \end{class}
%  
%  \composition{Trace}{links}{*}{TraceLink}
%  \draw [umlcd style, ->] ([yshift=40pt]TraceLink) -- (Element)
%  node[near end, above,xshift=-7pt]{source 1};
%  %node[near end, above]{sources}
%  %node[near end, below]{*};
%
%\draw [umlcd style, ->] ([yshift=-40pt]TraceLink) -- (Element)
%  node[near end, below,xshift=-7pt]{targets *};
%%  node[near end, below]{targets}
%%  node[near end, above]{*};
%%controls +(-160:5em) and +(140:5em) ..
%
%%  \unidirectionalAssociation{TraceLink}{sources}{*}{Element}
%%  \unidirectionalAssociation{TraceLink}{targets}{*}{Element}

  %test
  \composition{Trace}{links}{*}{ReferenceClass}
  \draw [umlcd style, ->] ([yshift=40pt]ReferenceClass) -- (SourceElement)
  node[near end, above,xshift=-14pt]{sources 1..*};
  %node[near end, above]{sources}
  %node[near end, below]{*};

\draw [umlcd style, ->] ([yshift=-40pt]ReferenceClass) -- (TargetElement)
  node[near end, below,xshift=-14pt]{targets 1..*};



\end{tikzpicture}