The description logic handbook
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The development of information management techniques is an important task in building future intelligent systems. In this context we describe the integration of the terminological knowledge representation system BACK with a relational database management system. High-level schemata definition and access to the knowledge base are provided by BACK, while persistency is obtained by the database management system. Query processing is delegated to the RDBMS by compiling knowledge base queries into a single (or few), complex SQL query. The run-time compiler is based on a semantic indexing technique provided by the terminological representation system.