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    The price of query rewriting in ontology-based data access

    Gottlob, G. and Kikot, Stanislav and Kontchakov, Roman and Podolskii, V. and Schwentick, T. and Zakharyaschev, Michael (2014) The price of query rewriting in ontology-based data access. Artificial Intelligence 213 , pp. 42-59. ISSN 0004-3702.

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    Abstract

    We give a solution to the succinctness problem for the size of first-order rewritings of conjunctive queries in ontology-based data access with ontology languages such as OWL 2 QL , linear Datalog±Datalog± and sticky Datalog±Datalog±. We show that positive existential and nonrecursive datalog rewritings, which do not use extra non-logical symbols (except for intensional predicates in the case of datalog rewritings), suffer an exponential blowup in the worst case, while first-order rewritings can grow superpolynomially unless NP⊆P/polyNP⊆P/poly. We also prove that nonrecursive datalog rewritings are in general exponentially more succinct than positive existential rewritings, while first-order rewritings can be superpolynomially more succinct than positive existential rewritings. On the other hand, we construct polynomial-size positive existential and nonrecursive datalog rewritings under the assumption that any data instance contains two fixed constants.

    Metadata

    Item Type: Article
    Keyword(s) / Subject(s): Ontology, Datalog, Conjunctive query, Query rewriting, Succinctness, Boolean circuit, Monotone complexity
    School: Birkbeck Schools and Departments > School of Business, Economics & Informatics > Computer Science and Information Systems
    Depositing User: Administrator
    Date Deposited: 07 May 2014 13:11
    Last Modified: 11 Oct 2016 15:26
    URI: http://eprints.bbk.ac.uk/id/eprint/9686

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