Abstract
We present a visual language expressive enough to capture an important subset of First Order Predicate Logic. We use the diagrams of our language to represent all the components of a deductive database schema: base predicates, derived predicates with their deductive rules, and integrity constraints. Our diagrams are grounded on two powerful visual metaphors: Venn/Euler diagrams and graphs, familiar to most designers. They are formal and independent of the application domain; they emphasize basic forms of logic description, the diagrammatic syntax being closer to the semantics; and they have a simple translation to Horn clauses. Thus, we aim at a situation where the generality of deductive databases would be fostered by the expected greater usability of visual schema languages in the hands of a wider group of practitioners.
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© 1998 Springer-Verlag Berlin Heidelberg
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Puigsegur, J., AgustÃ, J., Pastor, J.A. (1998). Towards visual schemas in deductive databases. In: Quirchmayr, G., Schweighofer, E., Bench-Capon, T.J. (eds) Database and Expert Systems Applications. DEXA 1998. Lecture Notes in Computer Science, vol 1460. Springer, Berlin, Heidelberg. https://doi.org/10.1007/BFb0054543
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DOI: https://doi.org/10.1007/BFb0054543
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