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Abstract

The WS-BPEL 2.0 (Web Service Business Process Execution Language) has been the dominant standard to describe Web Services (WS) orchestration approach. It is a rich and expressive language that provides interesting features, among them we find four mechanisms to deal with abnormal situations (Event, Fault, Compensation and Termination) handlers, EFCT-handlers. However, WS-BPEL is not rigorously defined as a formal language making EFCT-handlers complicated and ambiguous. This paper aims to remove ambiguities from EFCT-handlers by formalizing their semantics.