Istituto di Scienza e Tecnologie dell'Informazione     
Straccia U. A top-down query answering procedure for normal logic programs under the any-world assumption. In: 9th European Conference on Symbolic and Quantitative Approaches to Reasoning with Uncertainty. ECSQARU-07 (Hammamet, Tunisi, Ottobre 2007). Proceedings, pp. 115 - 127. (Lecture Notes in Computer Science, vol. 4724). Springer Verlag, 2007.
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 any assignment (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.
DOI: 10.1007/978-3-540-75256-1
Subject Logic Programming
I.2.4 Knowledge Representation Formalisms and Methods

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