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Encyclopedia of Database Systems pp 2488–2493Cite as

Schema Mapping Composition

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Synonyms

Mapping composition; Semantic mapping composition

Definition

A schema mapping (or mapping) is a triple \({\cal M}\) = (S 1, S 2, Σ), where S 1 and S 2 are relational schemas with no relation symbols in common and Σ is a set of formulas of some logical formalism over (S 1, S 2). An instance of \({\cal M}\) is a pair (I, J) where I is an instance of S 1 and J is an instance of S 2 such that (I, J) satisfies every formula in the set Σ. The set of all instances of \({\cal M}\) is denoted as Inst(\({\cal M}\)).

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Recommended Reading

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Author information

Authors and Affiliations

  1. University of California-Santa Cruz, Santa Cruz, CA, USA

    Wang-Chiew Tan

Authors
  1. Wang-Chiew Tan
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Editor information

Editors and Affiliations

  1. College of Computing, Georgia Institute of Technology, 266 Ferst Drive, 30332-0765, Atlanta, GA, USA

    LING LIU (Professor) (Professor)

  2. Database Research Group David R. Cheriton School of Computer Science, University of Waterloo, 200 University Avenue West, N2L 3G1, Waterloo, ON, Canada

    M. TAMER ÖZSU (Professor and Director, University Research Chair) (Professor and Director, University Research Chair)

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© 2009 Springer Science+Business Media, LLC

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Tan, WC. (2009). Schema Mapping Composition. In: LIU, L., ÖZSU, M.T. (eds) Encyclopedia of Database Systems. Springer, Boston, MA. https://doi.org/10.1007/978-0-387-39940-9_1467

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