Web services have become more and more important in these years, and BPEL4WS (BPEL) is the OASIS standard for web services composition and orchestration. It contains several distinct features, including scope-based compensation and fault handling mechanism. This paper focuses on the verification of BPEL programs, especially the verification of concurrent BPEL programs. The rely/guarantee approach is applied. Firstly, we present the operational semantics for BPEL programs. Secondly we apply the rely/guarantee method in the design of the verification rules. The rules can handle the features of BPEL programs, including compensation, fault handling and concurrency. Finally, the whole proof system is proved to be sound based on our operational semantics.
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