/* $Id: ExistenceChecker.java,v 1.2 2007/02/25 20:05:35 m31 Exp $
 *
 * This file is part of the project "Hilbert II" - http://www.qedeq.org
 *
 * Copyright 2000-2007,  Michael Meyling <mime@qedeq.org>.
 *
 * "Hilbert II" 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; either
 * version 2 of the License, or (at your option) any later version.
 *
 * 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.
 */

package org.qedeq.kernel.bo.logic;


/**
 * Check if operators are already defined.
 * <p>
 * If {@link #equalityOperatorExists()} returns <code>true</code> then
 * the call to {@link #predicateExists(String, int)} with the arguments
 * {@link #getEqualityOperator()} and 2 must return <code>true</code>.
 *
 * @version $Revision: 1.2 $
 * @author  Michael Meyling
 */
public interface ExistenceChecker extends PredicateExistenceChecker, FunctionExistenceChecker,
        ClassOperatorExistenceChecker, EqualityOperatorExistenceChecker {


}