Using Multiversion Object-Oriented Databases in CAD/CIM Systems

摘要

The Multiversion Hyper Data (MHD) approach to versioning in object-oriented databases for CAD/CIM is described. In this model, types of versions are introduced: revisions are used to model evolution in time, variants - to model parallel ways of development, and representations to model different forms of an object. Version types are related to the configurations rather than to single objects, thus permitting to automatically keep consistency of the sets of objects. Some operations specific for version types are proposed, including group operations for variants, and auto-derivation of one representation from another. Some implementation models are presented which differ in functionality, efficiency and potential application area.