A WSDL-based type system for asynchronous WS-BPEL processes

作者：Lapadula A; Pugliese R; Tiezzi F^*

来源：Formal Methods in System Design, 2011, 38(2): 119-157.

DOI：10.1007/s10703-010-0110-0

• Web services
• WSDL
• WS-BPEL
• Process calculi
• Type systems

We tackle the problem of providing rigorous formal foundations to current software engineering technologies for web services, and especially to WSDL and WS-BPEL, two of the most used XML-based standard languages for web services. We focus on a simplified fragment of WS-BPEL sufficiently expressive to model asynchronous interactions among web services in a network context. We present this language as a process calculus-like formalism, that we call ws-calculus, for which we define an operational semantics and a type system. The semantics provides a precise operational model of programs, while the type system forces a clean programming discipline for integrating collaborating services. We prove that the operational semantics of ws-calculus and the type system are 'sound' and apply our approach to some illustrative examples. We expect that our formal development can be used to make the relationship between WS-BPEL programs and the associated WSDL documents precise and to support verification of their conformance.

• 出版日期2011-4