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Please use this identifier to cite or link to this item: http://hdl.handle.net/1942/21031

Title: Implication and axiomatization of functional and constant constraints
Authors: Hellings, Jelle
Gyssens, Marc
Paredaens, Jan
Wu, Yuqing
Issue Date: 2016
Citation: Annals of mathematics and artificial intelligence, 76 (3-4), p. 251-279
Abstract: Akhtar et al. introduced equality-generating constraints and functional constraints as a first step towards dependency-like integrity constraints for RDF data [3]. Here, we focus on functional constraints. Since the usefulness of functional constraints is not limited to the RDF data model, we study the functional constraints in the more general setting of relations with arbitrary arity. We further introduce constant constraints and study the functional and constant constraints combined. Our main results are sound and complete axiomatizations for the functional and constant constraints, both separately and combined. These axiomatizations are derived using the chase algorithm for equality-generating constraints. For derivations of constant constraints, we show how every chase step can be simulated by a bounded number of applications of inference rules. For derivations of functional constraints, we show that the chase algorithm can be normalized to a more specialized symmetry-preserving chase algorithm performing so-called symmetry-preserving steps. We then show how each symmetry-preserving step can be simulated by a bounded number of applications of inference rules. The axiomatization for functional constraints is in particular applicable to the RDF data model, solving a major open problem of Akhtar et al.
Notes: Hellings, J (reprint author), Hasselt Univ, Fac Sci, Martelarenlaan 42, B-3500 Hasselt, Belgium. jelle.hellings@uhasselt.be; marc.gyssens@uhasselt.be; jan.paredaens@uantwerpen.be; melanie.wu@pomona.edu
URI: http://hdl.handle.net/1942/21031
DOI: 10.1007/s10472-015-9473-7
ISI #: 000374449500002
ISSN: 1012-2443
Category: A1
Type: Journal Contribution
Appears in Collections: Research publications

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