%%
%% The LaTeX Companion, 3ed
%%
%% Example 13-2-5 on page II-307 in "Document-level commands for shorthands".
%%
%% Copyright (C) 2022 Frank Mittelbach
%%
%% It may be distributed and/or modified under the conditions
%% of the LaTeX Project Public License, either version 1.3c
%% of this license or (at your option) any later version.
%%
%% See https://www.latex-project.org/lppl.txt for details.
%%

\documentclass{tlc3exa}
\pagestyle{empty}
\setcounter{page}{6}
\setlength\textwidth{135.0pt}

%StartShownPreambleCommands
\usepackage{xy}
\usepackage[french]{babel}
%StopShownPreambleCommands

\begin{document}
Voici un exemple avec \emph{xypic}:
\[ \shorthandoff{;?}
\begin{xy}  (0,0)*{\bullet}, (0,0) ; (10,0),
   **\dir {-} ?>* \dir {>}, (12,0)*{x},  \end{xy}
 \]
Quelle belle flèche !
\end{document}