The Research On Ontology-based Semantic Web Service Search Technology

With the rapid development of Internet and the fast increase of Web Service, Web Service is difficult to be found accurately. The reasons are following:Firstly, the WSDL is a syntax level language which just be used to describe Web Service's PortType, message, operation, bindingTemplate and service URL. It lacks the semantic description for Web Service. Secondly, the WSDL don't provide QoS information, so that it's hard to meet the quality requirement of Web Service for user. Thirdly, the UDDI lacks the support for OWL-S and just offers the query based on keyword. The precision of search results are very low. Lastly, the traditional Web Services search technology short of processing the useful information from query condition which makes the matching inefficient.Based the research on Ontology-based Semantic Web Service search technology, the Ontology-based Semantic Web Service Search Model of SWSF-O is presented in this dissertation. The researches for the SWSF-O are following:First, on the description of Web Services semantic, the serviceParameter of ServiceProfile is extended for QoS, that makes the OWL-S could be used to not only describe function information on Web Service but also support the description of service QoS.Second, on Web Services registration mechanism, the data model tModel is used to expand the traditional UDDI which map between the OWL-S Profile and UDDI on semantic information.Third, on query condition processing, the CSER algorithm is presented to extend the capability information of query condition, and then the normative request profile is transformed to OWL-S Profile.Finally, on Web Services matching, the Hierarchical Match Strategy is implemented for matching in this dissertation. The first level is ServiceCategory matching. The OCDS algorithm is used to match Web Services'functionality based semantic matching in the second level. The last level is QoS matching to meet users'performance requirements based on Service Pool.Four simulation experiments are done based on the SWSF-O. The four sets of result affirm that the precision matching is improved by improving on Web Service search technology, and users'performance requirements could be met by the SWSF-O.