Theoretically based on highly general ontological notions drawn from Analytical Philosophy, Modeling ability for EXPRESS and XML is evaluated, and the limits of current product data modeling approaches are indicated. An ontology based method for representing product data by XML is proposed. Compared with those existed solutions, this approach not only takes advantage of XMLs popularity and flexibility, and compatibility with STEPs rigorous description of product, but also aims at consistent semantic interoperation. The proposed method is of two levels: The first is building ontology level by extracting semantic knowledge from EXPRESS schema; in the second, XML schema is derived from ontology to access XML documents. And in this paper a formal semantic expression mechanism in description logics is introduced to capture the semantic of EXPRESS schema.
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