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    PVLDB
    2010
    125views more  PVLDB 2010»
    The Impact of Virtual Views on Containment
    13 years 9 months ago
    The Impact of Virtual Views on Containment
    Download  www.comp.nus.edu.sg
    Virtual views are a mechanism that facilitates re-use and makes queries easier to express. However the use of iterative view definitions makes very simple query evaluation and an...
    Michael Benedikt, Georg Gottlob
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    DEXA
    2010
    Springer
    157views Database» more  DEXA 2010»
    Containment of Conjunctive Queries with Negation: Algorithms and Experiments
    13 years 11 months ago
    Containment of Conjunctive Queries with Negation: Algorithms and Experiments
    Download  www.lirmm.fr
    We consider the containment problem for conjunctive queries with atomic negation. Firstly, we refine an existing algorithm based on homomorphism checks, which itself improves other...
    Khalil Ben Mohamed, Michel Leclère, Marie-L...
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    TREC
    2004
    96views Information Technology» more  TREC 2004»
    Using Clustering and Blade Clusters in the Terabyte Task
    14 years 24 days ago
    Using Clustering and Blade Clusters in the Terabyte Task
    Download  trec.nist.gov
    Web search engines exploit conjunctive queries and special ranking criteria which differ from the disjunctive queries typically used for ad-hoc retrieval. We wanted to asses the e...
    Giuseppe Attardi, Andrea Esuli, Chirag Patel
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    SEBD
    2007
    121views Database» more  SEBD 2007»
    Query Answering in Expressive Variants of DL-Lite
    14 years 26 days ago
    Query Answering in Expressive Variants of DL-Lite
    Download  www.inf.unibz.it
    The use of ontologies in various application domains, such as Data Integration, the Semantic Web, or ontology-based data management, where ontologies provide the access to large am...
    Alessandro Artale, Diego Calvanese, Roman Kontchak...
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    AMW
    2010
    203views Knowledge Management» more  AMW 2010»
    Query Rewriting under Non-Guarded Rules
    14 years 27 days ago
    Query Rewriting under Non-Guarded Rules
    Download  sunsite.informatik.rwth-aachen.de
    We address the problem of answering conjunctive queries over knowledge bases, specified by sets of first-order sentences called tuple-generating dependencies (TGDs). This problem i...
    Andrea Calì, Georg Gottlob, Andreas Pieris
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    DEXAW
    2008
    IEEE
    145views Database» more  DEXAW 2008»
    ECQ: A Simple Query Language for the Semantic Web
    14 years 1 months ago
    ECQ: A Simple Query Language for the Semantic Web
    Download  khaos.uma.es
    With the increasing development of real applications using Semantic Web Technologies, it is necessary to provide scalable and efficient ontology querying and reasoning systems. In ...
    María del Mar Roldán García, ...
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    DLOG
    2008
    102views Automated Reasoning» more  DLOG 2008»
    Conjunctive Query Answering in SH using Knots
    14 years 1 months ago
    Conjunctive Query Answering in SH using Knots
    Download  www.kr.tuwien.ac.at
    Answering conjunctive queries (CQs) has been recognized as a key task for the usage of Description Logics (DLs) in a number of applications. The problem has been studied by many au...
    Magdalena Ortiz, Mantas Simkus, Thomas Eiter
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    DLOG
    2007
    131views Automated Reasoning» more  DLOG 2007»
    Exploiting Conjunctive Queries in Description Logic Programs
    14 years 1 months ago
    Exploiting Conjunctive Queries in Description Logic Programs
    Download  isaim2008.unl.edu
    We present cq-programs, which enhance nonmonotonic description logics (dl-) programs by conjunctive queries (CQ) and union of conjunctive queries (UCQ) over Description Logics kno...
    Thomas Eiter, Giovambattista Ianni, Thomas Krennwa...
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    AAAI
    2007
    110views Intelligent Agents» more  AAAI 2007»
    DL-Lite in the Light of First-Order Logic
    14 years 1 months ago
    DL-Lite in the Light of First-Order Logic
    Download  www.inf.unibz.it
    The use of ontologies in various application domains, such as Data Integration, the Semantic Web, or ontology-based data management, where ontologies provide the access to large a...
    Alessandro Artale, Diego Calvanese, Roman Kontchak...
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    AAAI
    2008
    117views Intelligent Agents» more  AAAI 2008»
    Worst-case Optimal Conjunctive Query Answering for an Expressive Description Logic without Inverses
    14 years 1 months ago
    Worst-case Optimal Conjunctive Query Answering for an Expressive Description Logic without Inverses
    Download  www.kr.tuwien.ac.at
    Answering conjunctive queries (CQs) has been recognized as a key task for the usage of Description Logics (DLs) in a number of applications, and has thus been studied by many auth...
    Magdalena Ortiz, Mantas Simkus, Thomas Eiter
    claim paper
    Read More »
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