Research And Implementation Of Web Services Composition Relationships

Web Services are self-contained modular business applications that have open, Internet-oriented and standards-based interfaces. It provides a better solution for the interoperability and integration of heterogeneous applications under loose-coupled environment. However, single Web Service can only provide limited function, it can not fulfill complex business requirements, it is necessary to compose several elementary Web Services, So Web Services Composition technology has become a hot research topic.Web Services Composition is one of important researches of Web Services. Web Services Composition principal research problems are Web Services Composition Modeling, Web Service Composition Verifying, executing of composite web services and so on. The mainly research of this paper is the Web Services Composition Relationships Description. Based-digraph description method, it can not describe all composition relationships. Based-Petri net or based-semantic description method, they can describe all composition relationships, however their elements are complex, people can not easily understand and use. Based on the workflow pattern, we propose a Web Services Composition Relationships Descriptions method and describe 10 composition relationships. It can describe all the composition relations, its elements are very simple, people can easily understand and use. IN order to guarantee process's simplicity, open and good expansibility, we use XML Schema. The composition relationships are loose-coupled, can support dynamic Web Services Composition. People can create, update and delete composition relationship in the fly according to the changes of the business process. Based on those analyses, we design and implement a tool. When lots of web services creating composite applications, user can easily describe composition relationships. Finally, all of the works in this paper are summed up and their futures are prospected.