v0.2-RC1/chi/reference-manual/rail_diagrams/process_instance.tex

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\begin{rail}
ProcessInstance : [1] ( () | ( PROCESSNAMETK BECOMESTK ) )
                      PROCESSNAMETK PAROPENTK ( () | ( Expression + COMMATK ) ) PARCLOSETK
                | [2] UNWINDKW ( ( ( VARNAMETK + COMMATK ) INKW Expression ) + COMMATK )
                      COLONTK ( ProcessInstance + COMMATK ) ENDKW

                ;
\end{rail}