001/**
002 * Copyright (C) 2007 - 2016, Jens Lehmann
003 *
004 * This file is part of DL-Learner.
005 *
006 * DL-Learner is free software; you can redistribute it and/or modify
007 * it under the terms of the GNU General Public License as published by
008 * the Free Software Foundation; either version 3 of the License, or
009 * (at your option) any later version.
010 *
011 * DL-Learner is distributed in the hope that it will be useful,
012 * but WITHOUT ANY WARRANTY; without even the implied warranty of
013 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
014 * GNU General Public License for more details.
015 *
016 * You should have received a copy of the GNU General Public License
017 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
018 */
019package org.dllearner.algorithms.properties;
020
021import org.dllearner.core.ComponentAnn;
022import org.dllearner.kb.SparqlEndpointKS;
023import org.semanticweb.owlapi.model.AxiomType;
024import org.semanticweb.owlapi.model.OWLObjectProperty;
025import org.semanticweb.owlapi.model.OWLSymmetricObjectPropertyAxiom;
026
027import org.apache.jena.query.ParameterizedSparqlString;
028
029@ComponentAnn(name="symmetric object property axiom learner", shortName="oplsymm", version=0.1, description="A learning algorithm for symmetric object property axioms.")
030public class SymmetricObjectPropertyAxiomLearner extends ObjectPropertyCharacteristicsAxiomLearner<OWLSymmetricObjectPropertyAxiom> {
031        
032        public SymmetricObjectPropertyAxiomLearner(SparqlEndpointKS ks){
033                super(ks);
034                
035                super.posExamplesQueryTemplate = new ParameterizedSparqlString(
036                                "SELECT ?s ?o WHERE {?s ?p ?o . ?o ?p ?s .}");
037                super.negExamplesQueryTemplate = new ParameterizedSparqlString(
038                                "SELECT ?s ?o WHERE {?s ?p ?o . FILTER NOT EXISTS{?o ?p ?s .}");
039                
040                super.POS_FREQUENCY_QUERY = new ParameterizedSparqlString(
041                                        "SELECT (COUNT(*) AS ?cnt) WHERE {?s ?p ?o . ?o ?p ?s .}");
042                
043                axiomType = AxiomType.SYMMETRIC_OBJECT_PROPERTY;
044        }
045
046        /* (non-Javadoc)
047         * @see org.dllearner.algorithms.properties.ObjectPropertyCharacteristicsAxiomLearner#getAxiom(org.semanticweb.owlapi.model.OWLObjectProperty)
048         */
049        @Override
050        protected OWLSymmetricObjectPropertyAxiom getAxiom(OWLObjectProperty property) {
051                return df.getOWLSymmetricObjectPropertyAxiom(property);
052        }
053}