A Language to Define External Schemas in ODMG Databases.

Abstract

ODMG is the de facto standard for object-oriented databases (OODB) but does not address the definition of external schemas. In order to provide such functionality, we have developed an external schema definition methodology that allows the definition of external schemas in ODMG databases. In this work, the language used by the schema definer to specify the schema components (e.g. classes, interfaces, and so on) is proposed. Besides, we describe the effect caused on the ODMG schema repository by the definition of external schemas using the proposed language.