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by Manuel Torres, José Samos
In Proc. of 2000 OOIS
http://www-lsi.ugr.es/~bdf/Trabajos/oois%2700.pdf
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Abstract:
ABSTRACT. ODMG 3.0 (January 2000) does not specify how to define external schemas in object oriented databases and only offers a very basic mechanism for defining views, called named queries. In this paper, a system and a language for defining external schemas in ODMG databases are presented. Both are based on a mechanism that avoids the generation of classes that are not necessary in external schemas. The proposed language is an extension of ODMG ODL and allows the definition of external schemas using the ODMG named queries for defining derived classes. Nevertheless, the proposed language is independent of the derived classes definition mechanism used.
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