Grid is a newly developed technology for complex system with large-scale resource sharing, wide-area communication, multi-institutional collaboration, etc. A service-based approach for Grid can improve the extensibility and interoperability. In this paper, Service Oriented Grid Hierarchical Architecture is proposed within the OGSA framework, which gives a new approach to build the Grid. The need of semantic component in Grid to discover and describe the resources is analyzed and. a Star Model of Ontology is introduced to describe services semantically. A Grid Service Matchmaking Semantic method is presented on the base of the ontology.
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