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/**

Copyright (C) SYSTAP, LLC DBA Blazegraph 2006-2016.  All rights reserved.

Contact:
     SYSTAP, LLC DBA Blazegraph
     2501 Calvert ST NW #106
     Washington, DC 20008
     [email protected]

This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; version 2 of the License.

This program 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 General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
*/
package com.bigdata.rdf.rules;

import org.openrdf.model.vocabulary.RDF;
import org.openrdf.model.vocabulary.RDFS;

import com.bigdata.rdf.spo.SPOPredicate;
import com.bigdata.rdf.vocab.Vocabulary;
import com.bigdata.relation.rule.Rule;

/**
 * rdfs3:
 * 
 *  *    triple(v rdf:type x) :-
 *       triple(a rdfs:range x),
 *       triple(u a v).
 * 
 * 
 * Note: Literals can be entailed in the subject position by this rule and MUST
 * be explicitly filtered out. That task is handled by the
 * {@link DoNotAddFilter}. {@link RuleRdfs04b} is the other way that literals
 * can be entailed into the subject position.
 * 
 * @author Bryan Thompson
 * @version $Id$
 */
public class RuleRdfs03 extends Rule {

    /**
     * 
     */
    private static final long serialVersionUID = -7163102986933704154L;

    public RuleRdfs03( String relationName, Vocabulary vocab) {

        super( "rdfs03", //
                new SPOPredicate(relationName,var("v"), vocab.getConstant(RDF.TYPE), var("x")),//
                new SPOPredicate[] {//
                    new SPOPredicate(relationName,var("a"), vocab.getConstant(RDFS.RANGE), var("x")),//
                    new SPOPredicate(relationName,var("u"), var("a"), var("v"))//
                },
                null // constraints
                );

    }
    
}