Considering the existing problems in Web servicesuch as lack of semantic information and interoperability,atomic services can not cooperate with each other and becombined into composite services. In this paper, based onextended UDDI, we present a semantic annotationframework for Web service description and composition.The novel service matching algorithm not only takes intoaccount the height factor of ontology tree and local densityfactor for the impact of semantic distance, but also thedegree of semantic overlap. Experimental results show thatthe proposed service matching algorithm improved theefficiency of Web service discovery, and thus Web servicecan be composed easily to form more complicated interrelatedservices.
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