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    On decidability and tractability of querying in temporal EL

    Gutierrez Basulto, V. and Jung, J.C. and Kontchakov, Roman (2016) On decidability and tractability of querying in temporal EL. In: UNSPECIFIED (ed.) Proceedings of the 29th International Workshop on Description Logics. CEUR-WS.

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    We study access to temporal data with TEL, a temporal extension of the tractable description logic EL. Our aim is to establish a clear computational complexity landscape for the atomic query answering problem, in terms of both data and combined complexity. Atomic queries in full TEL turn out to be undecidable even in data complexity. Motivated by the negative result, we identify well-behaved yet expressive fragments of TEL. Our main contributions are a semantic and sufficient syntactic conditions for decidability and three orthogonal tractable fragments, which are based on restricted use of rigid roles, temporal operators, and novel acyclicity conditions on the ontologies.


    Item Type: Book Section
    Additional Information: Cape Town, South Africa, April 22-25, 2016. ISSN: 1613-0073
    School: Birkbeck Faculties and Schools > Faculty of Science > School of Computing and Mathematical Sciences
    Depositing User: Roman Kontchakov
    Date Deposited: 25 May 2016 14:38
    Last Modified: 09 Aug 2023 12:38


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