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Reversing Petri nets (RPNs) have recently been proposed as anet-basedapproach to model causal and out-of-causal order reversibility. Theyare based on the notion of individual tokens that can be connected together viabonds. In this paper we extend RPNs by allowing multiple tokens of the sametype to exist within a net based on the individual token interpretation ofPetri nets. According to this interpretation, tokens of the same type aredistinguished via their causal path. We develop a causal semantics of the modeland we prove that the expressive power of RPNs with multiple tokens isequivalent to that of RPNs with single tokens by establishing an isomporphismbetween the Labelled Transition Systems (LTSs) capturing the reachable parts ofthe respective RPN models.

Token Multiplicity in Reversing Petri Nets Under the Individual Token Interpretation