Frozen tokens and D-continuity: a study in relating system properties to process properties
Advances in Petri Nets 1984
Nonsequential processes
Zero-safe nets: comparing the collective and individual token approaches
Information and Computation - Special issue on EXPRESS 1997
Executing transactions in zero-safe nets
ICATPN'00 Proceedings of the 21st international conference on Application and theory of petri nets
Pattern based workflow design using reference nets
BPM'03 Proceedings of the 2003 international conference on Business process management
Concurrency in Mobile Object Net Systems
Fundamenta Informaticae - Concurrency Specification and Programming (CS&P'2002), Part 1
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Composition of modules to larger units is a technique frequently used during the software development life cycle. It is mostly used in a "bottom up" fashion, suggested by the principles of object orientation, where the composition of simple objects to a complex one plays a central role. Composition in Petri nets has been studied in the form of place and transition fusion. Zero-Safe Nets represent a special approach, which allows the use of more complex synchronisation structures, so-called transactions. The definition of transactions is based on interleaving semantics, i.e. on firing-sequences. Problems arise, since the definition is not closed with respect to the permutation of actions. This paper presents a partial order concurrency semantics for zero-safe nets based on Petri net processes. Using these semantics, a characterisation of such transactions closed with respect to permutation of concurrent actions becomes possible.