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This paper proposes an OWL-S framework for distributed CAD system based on the combination of semantic web service and CAD technology. Service ontology mapping mechanism is analyzed in detail and semantic model is built with the study of the correlation across the geometry modeling service. On the purpose of accommodating the design pattern of network modeling, this framework supports the service composition of three-dimensional geometry modeling and achieves further integration of service information. At last, a case study from the developed prototype system shows the feasibilit...