Interactions between Web services are based on interfaces which describe Web services on both structural and behavioral perspectives. It can happen that the interface provided by a service does no longer match (for instance, because of an evolution) the interface required by its partners. In this situation, and until the required interfaces are fixed, interactions cannot succeed. To address this issue, and focusing on the behavioral part of interfaces, we propose an approach based on a mediator which aims to seamlessly resolve incompatibilities during service interactions. We adopted a formal tool as finite-state automata, particularly Labeled Transition Systems to model the behavioral aspects of operations exposed by Web services.
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