%\begin{figure}
%  \begin{center}
  \begin{tabular}{ccccc}
  Process & & WorkDefinition & & WorkSequence \\
    $\downarrow$ & & $\downarrow$ & & $\downarrow$ \\
%    \begin{subfigure}[h]{0.25\linewidth}
    \begingroup
\tikzset{every picture/.style={scale=0.7}}%
    \input{figures/_SimpleProcess} 
\endgroup
%    \end{subfigure}
    & ~~~ &
%    \begin{subfigure}[h]{0.30\linewidth}
    \begingroup
\tikzset{every picture/.style={scale=0.6}}%
    \input{figures/_WorkDefinition} 
\endgroup
%    \end{subfigure}
    & ~~~ &
%    \begin{subfigure}[h]{0.35\linewidth}
    \begingroup
\tikzset{every picture/.style={scale=0.6}}%
    \input{figures/_WorkSequence}
\endgroup
%    \end{subfigure}
    \\
    %\emph{a. ProcessToPetriNet} & \emph{b. WorkDefinitionToPetriNet} & \emph{c. WorkSequenceToPetriNet}\\
    %\emph{(a)} & \emph{(b)} & \emph{(c)}\\
    \end{tabular}
%    \caption{Transformations élémentaires composant \texttt{SimplePDLToPetriNet}}
%    \label{fig:atomicpn}
%  \end{center}
%\end{figure}