Semantic Based Web Services Discovery

Web services have become a new wave of Internet technology development. It is a new solution for dynamic business interactions over the Internet. A critical step in the process of reusing existing Web services is the discovery of potentially relevant components. Current Web services technology only provides syntactic description for Web service. In this paper, we first analyze the limitations for current Web service standards and point out that semantic description is the basis for automatic service discovery. We put forward a new semantics based Web services discovery framework by extending UDDI framework. This framework provides operation level service discovery compared to UDDI architecture. The discovery process is in two stages. If exact match is not met, the match engine will search for suitable services to compose the target request. The composition algorithm is also analyzed. The method of semantic Web service annotation is discussed. We use an ontology based approach to capture real world knowledge for semantic service annotation. The prototype we have implemented gives a whole understanding of the discovery model we have proposed.