Papers by Eric Evangelista
Of the numerous formal approaches that deal with database inconsistencies with respect to integri... more Of the numerous formal approaches that deal with database inconsistencies with respect to integrity constraints, all share the view that such constraints are statements about the world the database models. An alternative perspective, however, considers constraints as statements about the knowledge the database has of its domain. The result of this shift in perspective allows us to regard integrity constraint violations as a fragment of the incomplete knowledge the system has of the world. We can then query the possibly inconsistent database for consistent query answers. We address the above considerations with an epistemic query language KC, where the possible ways to repair a database that violates its integrity constraints are characterized by a set of possible worlds, an epistemic state e c . This culminates in a situation where only consistent information is known. We ascertain this by querying ec with KC, providing a knowledge-level formalization of consistent query answers. At...
The author has further granted permission to Simon Fraser University to keep or make a digital co... more The author has further granted permission to Simon Fraser University to keep or make a digital copy for use in its circulating collection. The author has further agreed that permission for multiple copying of this work for scholarly purposes may be granted by either the author or the Dean of Graduate Studies. It is understood that copying or publication of this work for financial gain shall not be allowed without the author's written permission. \ Permission for public performance, or limited permission for private scholarly use, of any multimedia materials forming part of this work, may have been granted by the author. This information may be found on the separately catalogued multimedia material and in the signed Partial Copyright Licence.
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Papers by Eric Evangelista