A WSDL-Based Type System for WS-BPEL
We tackle the problem of providing rigorous formal foundations to current software engineering technologies for web services. We focus on two of the most used XML-based languages for web services: WSDL and WS-BPEL. To this aim, first we select an expressive subset of WS-BPEL, with special concern for modeling the interactions among web service instances in a network context, and define its operational semantics. We call ws-calculus the resulting formalism. Then, we put forward a rigorous typing discipline that formalizes the relationship existing between ws-calculus terms and the associated WSDL documents and supports verification of their compliance. We prove that the type system and the operational semantics of ws-calculus are ‘sound’ and apply our approach to an example application involving three interacting web services.
KeywordsOperational Semantic Service Instance Type Environment Business Process Execution Language Type Declaration
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- [LPT06]Lapadula, A., Pugliese, R., Tiezzi, F.: A wsdl-based type system for WSBPEL. TR, Dipartimento di Sistemi e Informatica, Univ. Firenze (2006), http://www.dsi.unifi.it/~pugliese/DOWNLOAD/wsc-full.ps