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Web services constitute a dynamic field of research about technologies of the Internet. WS-BPEL 2.0, is in the way for becoming a standard for defining Web services orchestration. To check the good behaviour of the produced compositions, but also to check equivalence between services, formalization is necessary. In this paper a contribution to the field of Formal Verification of Web services composition is presented using a πcalculus-based approach for the verification of composite Web services by applying model checking methods. We adopt the possibility of exploiting benefits from existing works by translating a Business Process Language such as BPEL to a system model of the π-calculus for which analysis and verification techniques have already been well established and there are existing tools for model checking systems. We therefore present the basis of a framework aimed to specification and verification, related to some temporal logic, of Web services composition. . . .

Toward a Pi-Calculus Based Verification Tool for Web Services Orchestrations