Research On Technology Of Services Composition And Matching Algorithm On The Basis Of Semantic Web Services

As infrastructures and systems supporting Web Services are getting into mature, more and more organizations begin to integrate Web Services as part of their business processes. They call for new workflow systems to support Web Services integration and functionality of traditional workflow systems to be extended. However, problems such as Web Services discovery, quality of services management of autonomous Web Services, and semantic integration of heterogeneous Web Services, need to be solved in web-services-enabled workflow systems.Semantic Web and Web Service are the two important trends which are emerging in the World Wide Web (WWW). The confluence of Web Services and the semantic Web gives birth to another new technology—Semantic Web Services. The Semantic Web markup language can be used to describe the semantics of Web Services and make them computer-interpretable entities, so as to enable programs or agent to locate, invoke and compose Web Services automatically.This thesis discusses several key issues in Semantic Web Services composition automation, including Semantic Web markup language, Semantic Web service description model, services composition mechanism and Web Services matching algorithm.In this broker prototype system, firstly we define a semantic description model (QWSML) for web services to support dynamic service composition over the Internet. Secondly this dissertations focus on the discovery mechanism of Web Services. We use extending Semantic information of web services to improving service description and discovery precision. The Discovery Service helps us find suitable Web Services through three steps: syntactical match, QoS match, and semantic match. Thirdly we also propose a mechanism to implement dynamic services composition and resource bindings.Finally, we put foward the solution of its integration into the existing system CTISS.