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Complete Process Semantics of Petri Nets

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Juhás G. , Lorenz R. , Mauser S.

2008

tom Vol. 87, nr 3-4

331-365

In the first part of this paper we extend the semantical framework proposed in [22] for process and causality semantics of Petri nets by an additional aim, firstly mentioned in the habilitation thesis [15]. The aim states that causality semantics deduced from process nets should be complete w.r.t. step semantics of a Petri net in the sense that each causality structure which is enabled w.r.t. step semantics corresponds to some process net. In the second part of this paper we examine several process semantics of different Petri net classes w.r.t. this aim. While it is well known that it is satisfied by the process semantics of place/transition Petri nets (p/t-nets), we show in particular that the process semantics of p/t-nets with weighted inhibitor arcs (PTI-nets) proposed in [22] does not satisfy the aim. We develop a modified process semantics of PTI-nets fulfilling the aim of completeness and also all remaining axioms of the semantical framework. Finally, we sketch results in literature concerning the aim of completeness for process definitions of various further Petri net classes. The paper is a revised and extended version of the conference paper [18].