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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 com.bigdata.rdf.spo.SPOPredicate;
import com.bigdata.rdf.vocab.Vocabulary;

/**
 * rdf1:
 * 
 *  * (?a rdf:type rdf:Property) :- ( ?u ?a ?y ).
 * 
 * 
 * Note: This rule is evaluated using a {@link DistinctTermScan}. The variables
 * that DO NOT appear in the head of the rule remain unbound in the generated
 * solutions (?u and ?y). When justifications are generated, those unbound
 * variables will be represented as ZERO (0L)s and interpreted as wildcards.
 */
public class RuleRdf01 extends AbstractRuleDistinctTermScan {
    
    /**
     * 
     */
    private static final long serialVersionUID = -7423082674586471243L;

    public RuleRdf01(String relationName,Vocabulary vocab) {

        super(  "rdf01",//
                new SPOPredicate(relationName,var("a"), vocab.getConstant(RDF.TYPE), vocab.getConstant(RDF.PROPERTY)), //
                new SPOPredicate[] { //
                    new SPOPredicate(relationName,var("u"), var("a"), var("y"))//
                },//
                null// constraints
                );

    }

}