code: package it.unibz.inf.ontop.spec.ontology;
  
  /*
   * #%L
   * ontop-obdalib-core
   * %%
   * Copyright (C) 2009 - 2014 Free University of Bozen-Bolzano
   * %%
   * Licensed under the Apache License, Version 2.0 (the "License");
   * you may not use this file except in compliance with the License.
   * You may obtain a copy of the License at
   * 
   *      http://www.apache.org/licenses/LICENSE-2.0
   * 
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   * #L%
   */
  
  import it.unibz.inf.ontop.model.term.ObjectConstant;
  
  /**
   * Represents ObjectPropertyAssertion from the OWL 2 QL Specification
   * 
   * ObjectPropertyAssertion := 'ObjectPropertyAssertion' '(' axiomAnnotations 
   * 									ObjectPropertyExpression sourceIndividual targetIndividual ')'
   * ObjectPropertyExpression := ObjectProperty | InverseObjectProperty
   * InverseObjectProperty := 'ObjectInverseOf' '(' ObjectProperty ')'
   * 
   * Support for owl:topObjectProperty and owl:bottomObjectProperty
   *     - the inverses of the two coincide with themselves 
   * 
   * @author Roman Kontchakov
   *
   */
  
  public interface ObjectPropertyAssertion {
  
  	ObjectPropertyExpression getProperty();
  	
  	ObjectConstant getSubject();
  	
  	ObjectConstant getObject();
  }
  