In this work we consider modeling of services with workflow modules, which form a Petri net subclass. The service compatibility problem is to answer the question, whether two services fit together, i.e. whether the composed system is correct. We study complementarity of resources, produced/consumed by two services-a necessary condition for the service compatibility. Resources, which are produced/consumed by a service, are represented as a multiset language. We define an algebra of multiset languages and present algorithms for checking conformance of resources for two given well-structured workflow modules.
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