Abstract
The relational data model has become the standard for mainstream database processing despite its well-known weakness in the area of representing application semantics. The research community's response to this situation has been the development of a collection of semantic data models that allow more of the meaning of information to be presented in a database. The primary tool for accomplishing this has been the use of various data abstractions, most commonly: inclusion, aggregation and association. This paper develops a general model for analyzing data abstractions, and then applies it to these three best-known abstractions.
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