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<p>A description is given of Algres, a programming environment that extends the relational model to handle complex objects and operations and integrates the logic programming paradigm. Algres is designed to be used to develop knowledge bases, software-engineering systems, office-automation systems, and computer-aided design and manufacturing databases. The discussion covers the Algres components, its data model, the RA abstract machine, and user languages. The system is written entirely in C.</p>
relational algebra; computer aided design databases; Algres; programming environment; relational model; complex objects; logic programming; knowledge bases; software-engineering systems; office-automation systems; manufacturing databases; data model; RA abstract machine; user languages; C; logic programming; programming environments; relational databases

S. Ceri, G. Lamperti, R. Zicari, S. Crespi-Reghizzi and L. A. Lavazza, "Algres: An Advanced Database System for Complex Applications," in IEEE Software, vol. 7, no. , pp. 68-78, 1990.
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