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    Reasoning over extended ER models

    Artale, A. and Calvanese, D. and Kontchakov, Roman and Ryzhikov, Vladislav and Zakharyaschev, M. (2007) Reasoning over extended ER models. In: Parent, C. and Schewe, K.-D. and Storey, V.S. and Thalheim, B. (eds.) Conceptual Modeling, ER 2007: 26th International Conference on Conceptual Modeling. Lecture Notes in Computer Science 4801. Springer, pp. 277-292. ISBN 9783540755623.

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    We investigate the computational complexity of reasoning over various fragments of the Extended Entity-Relationship (EER) language, which includes a number of constructs: isa between entities and relationships, disjointness and covering of entities and relationships, cardinality constraints for entities in relationships and their refinements as well as multiplicity constraints for attributes. We extend the known ExpTime-completeness result for UML class diagrams [5] and show that reasoning over EER diagrams with isa between relationships is ExpTime-complete even without relationship covering. Surprisingly, reasoning becomes NP-complete when we drop isa between relationships (while still allowing all types of constraints on entities). If we further omit disjointness and covering over entities, reasoning becomes polynomial. Our lower complexity bound results are proved by direct reductions, while the upper bounds follow from the correspondences with expressive variants of the description logic DL-Lite, which we establish in this paper. These correspondences also show the usefulness of DL-Lite as a language for reasoning over conceptual models and ontologies.


    Item Type: Book Section
    School: Birkbeck Faculties and Schools > Faculty of Science > School of Computing and Mathematical Sciences
    Depositing User: Sarah Hall
    Date Deposited: 11 May 2021 13:27
    Last Modified: 09 Aug 2023 12:50


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