On the Difference between Updating a Knowledge Base and Revising it

On the Difference between Updating a Knowledge Base and Revising it (0)

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by Hirofumi Katsuno , Alberto O. Mendelzon

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Datum	Value	Source
TITLE	On the Difference between Updating a Knowledge Base and Revising it	user correction - Legacy Corrections
AUTHOR NAME	Hirofumi Katsuno	SVM HeaderParse 0.1
AUTHOR AFFIL	NTT Basic Research Laboratories	SVM HeaderParse 0.2
AUTHOR ADDR	Musashino-shi, Tokyo 180, Japan	SVM HeaderParse 0.1
AUTHOR NAME	Alberto O. Mendelzon	SVM HeaderParse 0.1
AUTHOR AFFIL	Computer Systems Research Institute; University of Toronto	SVM HeaderParse 0.2
AUTHOR ADDR	Toronto, Canada M5S 1A4	SVM HeaderParse 0.1
ABSTRACT	this paper, we argue that no such set of postulates will be adequate for every application. In particular, we make a fundamental distinction between two kinds of modifications to a knowledge base. The first one, update, consists of bringing the knowledge base up to date when the world described by it changes. For example, most database updates are of this variety, e.g. "increase Joe's salary by 5%". Another example is the incorporation into the knowledge base of changes caused in the world by the actions of a robot (Ginsberg and Smith 1987, Winslett 1988, Winslett 1990) . We show that the AGM postulates must be drastically modified to describe update. The second type of modification, revision, is used when we are obtaining new information about a static world. For example, we may be trying to diagnose a faulty circuit and want to incorporate into the knowledge base the results of successive tests, where newer results may contradict old ones. We claim the AGM postulates describe only revision.	user correction - Legacy Corrections
YEAR	0	user correction - Legacy Corrections
VENUE TYPE	CONFERENCE	INFERENCE
PAGES	387--394	INFERENCE
CITATIONS	20 found	ParsCit 1.0