Enhancing Knowledge Representation in Engineering Databases

ion and property inheritance, (3) object representation, (4) nontraditional data, and (5) knowledge-base management. We concentrate upon facilities for conceptual modeling and information representation. Our intent is to identify major research developments and to examine their application to engineering data management. Figure 1. Data model classification. calculus, the current model endpoint is most often taken as the relational data model. The composition of this model is well understood.2 The knowledge base endpoint is at this time only a set of capabilities, including * representing both extensional values as well as more abstract infor-

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