A Practical Approach to Revising Prioritized Knowledge Bases |
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Authors: | Salem Benferhat Didier Dubois Henri Prade Mary-Anne Williams |
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Affiliation: | (1) Institut de Recherche en Informatique de Toulouse (IRIT), Université Paul Sabatier, 118, route de Narbonne, 31062 Toulouse Cedex 4, France;(2) Information Systems School of Management, University of Newcastle, NSW, 2308, Australia |
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Abstract: | This paper investigates simple syntactic methods for revising prioritized belief bases, that are semantically meaningful in the frameworks of possibility theory and of Spohn's ordinal conditional functions. Here, revising prioritized belief bases amounts to conditioning a distribution function on interpretations. The input information leading to the revision of a knowledge base can be sure or uncertain. Different types of scales for priorities are allowed: finite vs. infinite, numerical vs. ordinal. Syntactic revision is envisaged here as a process which transforms a prioritized belief bases into a new prioritized belief base, and thus allows a subsequent iteration. |
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Keywords: | belief revision Spohn ordinal conditional functions possibility theory |
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