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Traditionally, the design and implementation o-f a conventional database system begins with the choice o-f a data model followed by the specification of a model -based data language. Thus, the database system is restricted to a single data model and a specific data language. An alternative to this traditional approach to database—system development is the multi-lingual database system (MLDS) . This alternative approach enables the user to access and manage a large collection of databases via several data models and their corresponding data languages without the aforementioned restriction. In this thesis we present the specification and implementation of a relational /SQL language interface for the MLDS. Specifically, we present the specification and implementation of an interface which translates SQL language calls into attribute-based data language (ABDL) requests. We describe the software engineering aspects of our implementation and an overview of the four modules which comprise our relational /SQL language interface.

Traditionally, the design and implementation of a conventional database system begins and ends with the choice of a data model followed by the specification of a model-based data language. Thus, the database system is restricted to a single data model and a specific data language. An alternative to this traditional approach to database-system development is the multi-lingual database system (MLDS). This alternative approach enables the user to access and manage a large collection of databased via several data models and their corresponding data languages wihtout the aforementioned restiction. This thesis presents the specification and implementation of a relational/SQl language interface for the MLDS. Specifically, it presents the specification and implementation of an interface which translates SQL language calls into attribute-based language requests. We describe the software engineering aspects of our implementation and an overview of the four modules which comprise our relational/SQL language interface.