v0.2/chi/reference-manual/rail_diagrams/generic_expression.tex

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\begin{rail}
Expression : ( [1] ( CONSTANTNAMETK
                   | ENUMVALUENAMETK
                   | VARNAMETK
                   | FUNCTIONNAMETK
                   | PROCESSNAMETK ) )
           | ( [2] PAROPENTK Expression PARCLOSETK )
           | ( [3] TypedExpression )
           ;
\end{rail}