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

  \begin{class}{Trace}{-5,0}
  \end{class}
  
  \begin{class}{Relationship}{0,0}
%  \attribute{name : String}
  \end{class}
  
  \begin{class}{Attribute}{5,0}
%    \attribute{name : String}
  \end{class}
  
  \composition{Trace}{}{1..*}{Relationship}
  \unidirectionalAssociation{Relationship}{}{1}{Trace}
  
  \composition{Relationship}{}{0..*}{Element}
  \unidirectionalAssociation{Element}{}{1}{Relationship}

\end{tikzpicture}