OWL-S Based Platform Of Automatic Discovery, Selection, Execution And Composition Of Semantic Web Services

With rapid development and proliferation of Web services, users will often be faced with a lot of same type of Web services. These same types of Web services provide same function, but their other parameters (ie. service response time, service cost, and service area, etc) can be different. It's unrealistic and ineffective to manually select and execute Web services. A good way to solve the problem is to automate the selection and execution of same type of Web services according to users'status (requirements) and parameters of Web services. Up to time, there are no researchers who bring up this problem and give a good solution. This paper gives a solution of this problem based on Web services ontology language—OWL-S, constructing a platform of automatic discovery, selection, and execution of Web services in a specific domain. In Web services discovery, this platform adopts DF mechanism of JADE rather than UDDI mechanism, which reduces the response time of services and lifts up the effiency of the system. But the platform can't be too big; it's usually realized on a specific domain. Area match function based on area ontology is realized in Web services selection. Service request agent gives a remembrance function of user bahavoiors. Through semantic support provided by OWL-S, the platform shows basic inteliggence in selection and matching of Web services. It also can adapt to user's different need, and fulfill the requirement of providing best services to any customers with high efficiency.In order to provide best services any time (through dynamic composition of Web services), and the response time not exceeding the range that users can suffer. This paper gives a highly efficient dynamic composition of Web services. The platforms realized before usually have the shortcoming of low effiency. And users can't suffer too long response period; the bad execution inefficiency can be a big obstacle of proliferation of dynamic composite Web services. Through distributed, independent, pallell replacement process of Web services composition, this paper gives an available methode to promote the effiency of dynamic Web services composition, and a prototype platform is presented. In order to promote the efficiency of services matching, an automic functional matching of Web services based on OWL shared ontology is alse presented.The combination of two platforms mentioned above can provide best services in specific domain any time for any costomers with high efficiency.