Operative Semantic Web Services Oeuvre

Web service composition is one of the challenging issues that have been studiedover the past years. It consists of combining existing web services to best suit new user requirements. This paper suggests an UML profile to compose web services based on their behavioral aspects. The Web Service Description Language (WSDL) files are first transformed to Unified Modeling Language (UML) models; then the profile is used to integrate UML models and this will be transformed into Business Process Execution Language (BPEL) process using Model Driven Architecture (MDA) approach. Our approach consists of three main steps. In the first step, existing simple web services are discovered and situated in the web service registry. The developer significances the WSDL files of the candidate services and translates them into UML diagrams (class diagram, use case diagram and sequence diagrams). In the second step, the sequence diagrams are in the form of scenarios, are integrated into a single sequence diagram that describes the behavior of the composite web service, by using the interaction operators of UML 2.0. In the third step, the MDA approach is adopted to transmute the consequential sequence diagram into a BPEL process. Proposed method has the advantages of being self-governing of the web service composition language and the UML modeling (Visual Paradism) tool.