Modelling CAD-Objects by abstraction
In the field of technical applications (CAD/CAM) the representation and administration of complex objects and versions is of great importance. This paper presents a universal model for these aspects, and outlines a corresponding language. The model is based on an abstraction mechanism which relates objects on different levels of abstraction. Each object represents a certain view of a real-world object, tailored to the demands of the user (person or program) of the database. The mechanism of abstraction allows to create new objects by specializing or generalizing existing objects. Furthermore, the abstraction relationship can be used to model the concept of versions: The common properties of versions are expressed by a more abstract object. By weakening the separation of types and objects this model allows to represent individually structured objects (in particular CAD-objects) as well as homogeneously structured data (as handeled by today's database systems) in an integrated way.
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