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THE ORAC MODEL: A LAYERED VIEW OF DATA ABSTRACTIONS.

GUANGPING WEI

出版	University of MICHIGAN, 1992
URL	http://books.google.com.hk/books?id=v2UeAQAAMAAJ&hl=&source=gbs_api

註釋

The key to tackling such problems is to identify a set of essential semantic modeling generics which are humanly intuitive, semantically expressive, and can be naturally mapped into simple mathematical concepts. In this dissertation, we introduce a new data model, called the object-relationship-abstraction-constraint (ORAC) model, with a layered view of data abstractions. We focus on two types of generics: structural constructs and constraint primitives. The structural constructs are the basic semantic