freepascal.compiler/docs/syntax/procedur.syn

\begin{diagram}{Procedure declaration}{proceduredeclaration}
\begin{mysyntdiag}
\synt{procedure\ declaration}
\synt{procedure\ header} \lit* ;
\synt{subroutine\ block} \lit *;
\end{mysyntdiag}
\begin{mysyntdiag}
\synt{procedure\ header}
\lit*{procedure} 
\(
\synt{identifier}\\
\synt{qualified\ method\ identifier}
\)
\synt{formal\ parameter\ list}
\[ \synt{modifiers} \]
\end{mysyntdiag}
\begin{mysyntdiag}
\synt{subroutine\ block}
\(
\synt{block}\\
\synt{external\ directive}\\
\synt{asm\ block}\\
\lit*{forward}
\)
\end{mysyntdiag}
\end{diagram}