\begin{diagram}{Operator definitions}{operatordef}
\begin{mysyntdiag}
\synt{operator\ definition} 
\lit*{operator}
\(
\synt{assignment\ operator\ definition} \\
\synt{arithmetic\ operator\ definition} \\
\synt{comparision\ operator\ definition}
\)
\synt{result\ identifier}
\lit*{:}
\synt{result\ type}
\lit*{;}
\synt{subroutine\ block}
\end{mysyntdiag}
\begin{mysyntdiag}
\synt{assignment\ operator\ definition}
\lit*{:=}
\lit*{(}
\synt{value\ parameter}
\lit*{)}
\end{mysyntdiag}
\begin{mysyntdiag}
\synt{arithmetic\ operator\ definition}
\(
\lit*{+}\\
\lit*{-}\\
\lit*{*}\\
\lit*{/}\\
\lit*{**}
\)
\lit*{(}
\synt{parameter\ list}
\lit*{)}
\end{mysyntdiag}
\begin{mysyntdiag}
\synt{comparision\ operator\ definition}
\(
\verb+ = + \\
\verb+ < + \\
\verb+ <= + \\
\verb+ > + \\
\verb+ >= +
\)
\lit*{(}
\synt{parameter\ list}
\lit*{)}
\end{mysyntdiag}
\end{diagram}