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Erschienen in:
2013 | OriginalPaper | Buchkapitel
Semantics Preservation in Schema Mappings within Data Exchange Systems
verfasst von : Tadeusz Pankowski
Erschienen in: Knowledge Engineering, Machine Learning and Lattice Computing with Applications
Verlag: Springer Berlin Heidelberg
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We discuss the problem of preservation of semantics of data in data exchange systems. Semantics of data is defined in a source database schema by means of integrity constraints and we expect that the semantics will be preserved after transforming the data into a target database. The transformation is defined by means of schema mappings. In order to reason about soundness and completeness of such mappings with respect to semantics preservation, we propose a method of developing a knowledge base capturing both databases and mappings in a data exchange system.Then formal reasoning about consistency of schema mappings with integrity constraints of databases and with knowledge of application domain can be performed.