Declarative semantics for active rules

  • Authors:
  • Sergio Flesca;Sergio Greco

  • Affiliations:
  • DEIS, Università della Calabria, 87030 Rende, Italy (e-mail: flesca@si.deis.unical.it);DEIS, Università della Calabria, and ISI-CNR, 87030 Rende, Italy (e-mail: greco@deis.unical.it)

  • Venue:
  • Theory and Practice of Logic Programming
  • Year:
  • 2001

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Abstract

In this paper we analyze declarative deterministic and non-deterministic semantics for active rules. In particular, we consider several (partial) stable model semantics, previously defined for deductive rules, such as well-founded, max deterministic, unique total stable model, total stable model and maximal stable model semantics. The semantics of an active program 𝒜𝒫 is given by first rewriting it into a deductive program ℒ𝒫, then computing a model M defining the declarative semantics of ℒ𝒫 and, finally, applying ‘consistent’ updates contained in M to the source database. The framework we propose permits a natural integration of deductive and active rules and can also be applied to queries with function symbols or to queries over infinite databases.