%A Alessandro Lapadula
%A Rosario Pugliese
%A Francesco Tiezzi
%L eprints419
%V 4038
%R 10.1007/11767954_10
%S Lecture Notes in Computer Science
%D 2006
%O ?Springer-Verlag Berlin Heidelberg 2006. The original publication is available at www.springerlink.com
%E Paolo Ciancarini
%E Herbert Wiklicky
%B COORDINATION
%T A WSDL-Based Type System for WS-BPEL
%P 145-163
%I Springer
%X 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.