Research On The Composition Of Semantic Web Services

With the development of Web service technology, more and more service providers provide service in the form of Web service. When a single Web service can not meet the requirement, multiple services should be composed to fulfill it. How to realize efficient and accurate service composition is the hotspot now. Web service composition involves many questions, such as Web service description, the method of Web service composition and selection of Web service. Based on former research and semantic Web service technology, research on dynamic Web service composition is carried out.By introducing semantic Web service into traditional graph based service composition, a novel semantic Web service composition method is proposed. It includes three steps. First, describing service requirement in formal language using Ontology. Second, generating parameter dependence diagram from inputs to outputs using the formal discription of service requirement. Third, inducing composition relation graph using the parameter dependence diagram. With the semantic information, our method has a high accuracy and success rate as it can handle multiple inputs and outputs situation. In solution to the problem of inaccurate matching degree of semantic parameters, an interface matching method is proposed based on the idea of conception similarity. Similarity of service request parameters and interface parameters are calculated to solve the service selection problem and improve selection rationality in this method.Effective solutions for two major problems in Web service composition, which have certain meaning for promoting research and utilization on Web service composition are proposed in this paper.