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string


\begin{usage}
string~a\\ string?~a
\end{usage}

\begin{signatures}
string: & \% $\to$\ \htmlref{\texttt{String}}{String}\\
string?: & \% $\to$\ \htmlref{\texttt{Boolean}}{Boolean}\\\end{signatures}

\begin{params}
{\em a} & \% & A leaf\\
\end{params}

\begin{retval}
string~a returns the value of $a$\ as a \htmlref{\texttt{String...
...\htmlref{\texttt{String}}{String}, {\it false}\xspace ~otherwise.\end{retval}


Manuel Bronstein 2000-12-13