Research On Web Service Dynamic Dicovery And Its Comoposition Technology On The Basis Of Ontology

In recent years,two kinds of important research work has promoted the development of WWW technology.One is the research on Web service,the other is research on semantic web.Those two researches have complement each other very well.Web service is an effective mechanism to integrate information and data.Existing web service technology has solved many technical problems.However,web service and its description with no semantic information has become a great obstacle on the road of web service's development and wide application.Adding semantic explaination to present web service description can laid a foundation to the realization of intelligent automated service.This can be basically dealt with importing ontology and its technology into web service technology.Meanwhile,as ontology has abundant semantic information and a wide range of relations which can reform today's web service and convert it to semantic web service.So the transformation of web service from automation to intellection has become possible.That is to say,the two kinds research work can give full play to its role through appropriate design .A kind of automated web service collaboration mechanism can be formed by combining the semantic extension of semantic web and the diversity feature of web service. This dissertation has focused on the research on the automatic discovery and composition technology of web service on the basis of present ontology theory research.High efficient and automatic service discovery can be implemented by semantic description and service ontology.Marking present web service semantically with ontology language can help machines to comprehend service and analyze service with intelligent agent,thus realizing service automatic discovery and composition.To ensure the security and reliability of atomic service and compositive service in their dynamic execution processes,this dissertation has done the following research work. Through research on theories of Petri nets,this dissertaiton has analyzed action features of web service using abundant analysis technology provided by petri net.Then this dissertaion has established corresponding petri net modules of atomic service and compositive service and extended present web service modules.