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Web Ontology Language Java
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OWL-BGP is a SPARQL implementation based on ARQ (http://jena.sourceforge.net/ARQ/) where basic graph patterns are evaluated with OWL 2 Direct Semantics. Thus, OWL-BGP implements the SPARQL OWL Direct Semantics entailment regime. Internally, any OWL 2 DL reasoner that implements the OWLReasoner interface of the OWL API (http://owlapi.sourceforge.net/) can be used although the default reasoner for OWL-BGP is HermiT (http://hermit-reasoner.com). For HermiT a special cost-based query atom ordering is performed, otherwise only limited cost-based ordering for query atoms is available. The main class of the implementation is GUI_Demo in the package org.semanticweb.sparql which the user can run using eclipse or some other editor. The location where the queried ontology has been saved should be given as a program argument and whether the user wants static or dynamic ordering to be performed on the atoms of the queries should be given as a VM argument in the form -Dordering="Dynamic" (for dynamic ordering) or -Dordering="Static" (for static ordering). The default is static ordering. OWL-BGP is free software: you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version. OWL-BGP is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details. Copies of the GNU General Public License and the GNU Lesser General Public License have been included with this distribution in the file `gpl.txt` and lgpl-3.0.txt, respectively. An online version is available at <http://www.gnu.org/licenses/>. More information about OWL-BGP is available at <http://code.google.com/p/owl-bgp/>, or by contacting Birte Glimm at the Oxford University Computing Laboratory. OWL-BGP uses the following libraries in unmodified form: 1) ARQ and ARQ-tests http://jena.sourceforge.net/ARQ/ see lib/ARQ.LICENSE 2) Jena and Jena-tests http://jena.sourceforge.net/ see lib/Jena.LICENSE 3) The OWL API, http://owlapi.sourceforge.net released under LGPL 3.0, see lib/owlapi.LICENSE 4) Hermit, http://hermit-reasoner.com released under LGPL 3.0, see lib/HermiT.LICENSE 5) ICU4J, http://site.icu-project.org/ see lib/ICU4J.LICENSE 6) IRI http://jena.sourceforge.net/iri/ see lib/IRI.LICENSE 7) Log4j, http://logging.apache.org/log4j/ released under The Apache Software License, Version 2.0, see lib/Log4j.LICENSE 8) slf4j-api and slf4j-log4j12, http://slf4j.org/ released under MIT License, see lib/slf4j.LICENSE 9) Xerces, http://xerces.apache.org/xerces2-j/ released under The Apache Software License, Version 2.0, see lib/xerces.LICENSE