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Lecture Notes in Computer Science
Data integration consists in providing a uniform access to a set of heterogeneous sources through a common representation called global schema. In this paper we present DIS@DIS, a data integration system that adopts innovative techniques for query answering in a complex integration environment. In particular, DIS@DIS is able to deal with integrity constraints, which are used to enhance the expressiveness of the global schema. Since data at the sources may not satisfy the constraints, DIS@DIS isdoi:10.1007/978-3-540-25975-6_6 fatcat:cttvqylnmvb35i4phpkoumkwiy