Abstract
Web services and SOA technologies are growing with a fast rate but still facing many problems due to their heterogeneous nature. This paper, based on OWL-S, presents a rich and extensible ontology framework named OWL-QSP for service compositions. In the framework, Service Type is imported to improve service abstract level, and QoS, situation, context are adopted. Since service discovery, service selection and service execution can adapt to the changing situation, QoS and situation-aware service-based systems are more dynamic and flexible so to better satisfy the users' functional and non-functional requirements. The introducing of policy permits managing WSs at a high level and facilitate reuse. It also presents SMICE, a prototype of the service composition system, and describes its main components with service composition process.
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