freepascal.compiler/docs/syntax/expsimpl.syn

\begin{diagram}{Expressions}{expressions}
\begin{mysyntdiag}
\synt{expression}
\synt{simple\ expression}
\[ 
\(
 \verb+ * +  \\
 \verb+ <= + \\
 \verb+ > +  \\
 \verb+ >= + \\
 \verb+ = +  \\
 \verb+ <> + \\
 \verb+ in + \\
 \verb+ is + 
\)
\synt{simple\ expression}
\]
\end{mysyntdiag}
\begin{mysyntdiag}
\synt{simple\ expression} 
\<[b] \synt{term} \\
\( 
 \lit* + \\
 \lit* - \\
 \lit*{or} \\
 \lit*{xor} 
\)
\>
\end{mysyntdiag}
\end{diagram}