\section*{Guidelines to read}
\label{guidelines_to_read}

(1) For each entity, we have several sub-paragraphs.\\ 

\begin{center}
Standard attributes
\end{center}

We define in this part the main properties of entity. \\

\begin{center}
Legality rules
\end{center}

(L1) We define here the constraints of entity.\\

\begin{center}
Annexes
\end{center}

(A1) This part completes the standard attributes definitions. It allows to define precisely the attributes.\\

(A2) The annexes of an entity allow to define the sub attributes of this entity.\\

\begin{center}
Implementation
\end{center}

This corresponds to a table, which give the precise denomination of attributes with their types.\\

\begin{center}
Example
\end{center}

We present here an example of use of entity.\\