Abstract
This paper addresses quality of service aspects of Web Services (WS) orchestrations created using the Business Process Execution Language for Web Services (BPEL4WS). BPEL4WS is a promising language describing the WS orchestrations in form of Business Processes, but it lacks of a sound formal semantic, which hinders the formal analysis and verification of business processes specified in it. Formal methods, like Petri Nets (PN), may provide a means to analyse BPEL4WS processes, evaluating its performance, detecting weaknesses and errors in the process model already at design-time. A framework for transformation of BPEL4WS into Generalized Stochastic Petri Nets (GSPN) is proposed to analyse the performance and throughput of WS, based on the execution of orchestrated processes.
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