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%
   */
  
  /**
   * Represents the following from OWL 2 QL Specification:
   * 
   * for T = ClassExpression: 
   * 			SubClassOf, EquivalentClasses, 
   *          ObjectPropertyDomain, ObjectPropertyRange, 
   *          DataPropertyDomain 
   *        
   * for T = DataRangeExpression:
   * 			DataPropertyRange 
   *          (sub is DataPropertyRangeExpression; super is Datatype)  
   *          
   * for T = ObjectPropertyExpression:
   *      SubObjectPropertyOf, EquivalentObjectProperties, SymmetricObjectProperties
   *      
   * for T = DataPropertyExpression:      
   *      SubDataPropertyOf, EquivalentDataProperties 
   * 
   * @author roman
   *
   */
  
  public interface BinaryAxiom<T> {
  
  	T getSub();
  
  	T getSuper();
  }
  