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Lecture Notes in Computer Science
We address the problem of answering queries using expressive symmetric inter-schema constraints which allow to establish mappings between several heterogeneous information systems. This problem is of high relevance to data integration, as symmetric constraints are essential for dealing with true concept mismatch and are generalizations of the kinds of mappings supported by both local-as-view and global-as-view approaches that were previously studied in the literature. Moreover, the flexibilitydoi:10.1007/3-540-45758-5_9 fatcat:i4oo4h4q5fetzek6xud3nosxra