Research Of Web Information Integration Based On Ontology And Service Discovery

With the rapid development of the web information, how to construct the Web Information Integration System(WIIS) to organize and manage such distributed Web information effectively, and to find out useful information efficiently, is becoming a challenging but exciting research topic.This dissertation presented a new web information integrated system, based on the overview of current research and implementation instances for WIIS. This dissertation focuses on several problems, which are: how to build effective domain ontology, how to wrap data source (such as: web service, service description) well, and how to explore the high performance for resolving query decomposition based on web services discovery. The main work of this dissertation is as follows:First,add a services layer between Mediator and Wrapper,which includes all the various data source services which wrapped as web services. The Semantic Web Ontology Language (OWL-S) is used to describe the data source services, which forms the loose coupling architecture of the mediator and data source and makes the visit more transparent.Second, on the realization of the Mediator, the system adopts the LAV model with a semantic dynamic service discovering mechanism. It is easier to support the extending of the dynamic data sources; Decomposition made inquiries in connection with a semantic matching algorithm--Semantic Match and Choice algorithm using the semantic similarity, Inquiries option to achieve complete decomposition. Furthermore, because global view and local view are all constructed based on domain-based Ontology, the conflict of semantic field be avoided.Third, a domain-based Ontology, Ontology-based wrapping service and semantic description of the data sources and mediator modules, including query processing, service discovery and selection strategy are designed and implemented. Then a brief introduction on the main structure of Ontology and the achievement of decomposition algorithm is given by this dissertation.