Abstract
Web services are a very appropriate communication mechanism to perform distributed business processes among several organizations. These processes should be reliable, because a failure in them can cause high economic losses. To provide a framework to compose lots of specialized services flexibly, BPEL4WS is proposed to describe Web services composition. But the language is lack of the support for checking the correctness of composition. It has to depend on formal verification method which helps to check the correctness of services composition. In order to solve above shortages of BPEL4WS, This paper presents a formal approach which verifies BPEL4WS using the interface automata. In this approach, BPEL4WS is mapped into interface automata, which is then transformed into Promela (It is the input language of SPIN model checker.), and the correctness properties of Web services composition can be verified by SPIN. Finally, paper gives a case study to illustrate the proposed approach.
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