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As more and more Web services are deployed, Web service's discovery mechanisms become essential. Similar services can have quite different QoS behaviors. For service selection and management purpose, it is necessary to clearly specify QoS constraints and metrics definitions for Web services. We investigate on the semantic QoS specification and introduce our design principles on it. Based on the specification refinement and conformance, we introduce the QoS matchmaking algorithm with multipledoi:10.1145/1062745.1062873 dblp:conf/www/ZhouCL05 fatcat:qd5rhbhowfd7hi55njiiikg2rq