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    PODS
    2008
    ACM
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    Data exchange and schema mappings in open and closed worlds
    14 years 4 months ago
    Data exchange and schema mappings in open and closed worlds
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    In the study of data exchange one usually assumes an openworld semantics, making it possible to extend instances of target schemas. An alternative closed-world semantics only move...
    Leonid Libkin, Cristina Sirangelo
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