This paper presents the ESPRIT project IRO-DB that aims at the provision of tools to achieve the interoperability between preexisting object-oriented and relational databases. The main components developed are a local layer consisting of database adapters that provide uniform interfaces to heterogeneous databases on the basis of the standard for object-oriented databases ODMG, a communication layer that supports object-oriented remote data access, and an interoperable layer that realizes means to access multiple databases through an integrated schema.

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