A practical approach to revising prioritized knowledge-bases
Résumé
This paper investigates simple syntactic methods to revise prioritized belief bases, that are semantically meaningful in the frameworks of possibility theory and of Spohn's (1988) ordinal conditional functions. Here, revising prioritized belief bases amounts to conditioning a distribution function on interpretations. Different types of scales for priorities are discussed: finite vs. infinite, numerical vs. ordinal. Syntactic revision is envisaged as a process which transforms prioritized belief bases into a new prioritized belief base, and thus allows for the subsequent iteration.