Tractable Query Answering over Conceptual Schemata

    ER, pp. 175-190, 2009.

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    Keywords:
    conceptual schemataconceptual datatractable query answeringdata complexityeer formalismMore(11+)

    Abstract:

    We address the problem of answering conjunctive queries over extended Entity-Relationship schemata, which we call EER (Extended ER) schemata, with is-a among entities and relationships, and cardinality constraints. This is a common setting in conceptual data modelling, where reasoning over incomplete data with respect to a knowledge base ...More

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