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In this paper, we discuss the semantics of BPEL4WS language which is a de facto standard for specifying and execution workflow specification for web service composition and orchestration. We propose a language μ-BPEL that includes most primitive and structured activities of BPEL4WS, and define its semantics. As the Timed Automata (TA) is powerful in designing real-time models with multiple clocks and has well developed automatic tool support, we define a map from μ-BPEL into composable TA.doi:10.1016/j.entcs.2005.07.035 fatcat:yj33wazhzjhw5jakd5xl2cck74