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In an integrated automation system a well-designed data model and computation model are required. For the engineering of such a system one often faces a challenge of finding the suitable computation elements defined in the computation model for the data defined in the data model, especially when the data model and the computation model are complex. In this paper we will use the ontology technology and Web services to address the challenge in an intelligent way. We will present the required ontology model including the formal expression, the binding conditions, the object model, XML representation and the corresponding system architecture for implementation. Evaluation is also given to show the usefulness of the approach.