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An Algebraic Semantics for Hierarchical P/T Nets.

Basten, T.; Voorhoeve, M.

In: Proceeding of the 16th International Conference on Application and Theory of Petri Nets, Turin, June 1995., pages 45-65. 1995.

Abstract: The first part of this paper gives an algebraic sematnics for Place/Transition nets in terms of an algebra which is based on the process algebra ACP. The algebraic semantics is such that aP/T net and its term representation have the same operational behavior. As opposed to other approaches in the literature, the actions in the algebra do not correspond to the firing of a transition, but to the consumption or production of tokens. Equality to P/T nets can be determined in a purely equational way. The second part of this paper extends the results to hierarchical P/T nets. It gives a compositional algebraic semantics for both their complete operational behavior and their high-level, observable behavior. By means of a non-trivial example, the Alternating-Bit Protocol, it is shown that the notions of abstraction and verification in the process algebra ACP can be used to verify in an equational way whether a hierarchical P/T net satisfies some algebraic specification of its observable behavior. Thus, the theory in this paper can be used to determine whether two hierarchical P/T nets have the same observable behavior. As an example, it is shown that the Alternating-Bit Protocol behaves as a simple one-place buffer. The theory forms a basis for a modular, top-down design methodology based on Petri nets.

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