By David Harel
Communications of the ACM,
May 1988,
Vol. 31 No. 5, Pages 514-530
10.1145/42411.42414
Comments
The higraph, a general kind of diagramming object, forms a visual formalism of topological nature. Higraphs are suited for a wide array of applications to databases, knowledge representation, and, most notably, the behavioral specification of complex concurrent systems using the higraph-based language of statecharts.
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