A Top-Down Query Answering Procedure for Normal Logic Programs Under the Any-World Assumption

  • Authors:
  • Umberto Straccia

  • Affiliations:
  • ISTI-CNR, Pisa, Italy 56124

  • Venue:
  • ECSQARU '07 Proceedings of the 9th European Conference on Symbolic and Quantitative Approaches to Reasoning with Uncertainty
  • Year:
  • 2007

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Abstract

The Any-World Assumption (AWA) has been introduced for normal logic programs as a generalization of the well-known notions of Closed World Assumption (CWA) and the Open World Assumption (OWA). The AWA allows anyassignment (i.e., interpretation), over a truth space(bilattice), to be a default assumption and, thus, the CWA and OWA are just special cases. To answer queries, we provide a novel and simple top-down procedure.