/* * $Id: ConcreteFunction.java,v 1.2 2002/12/16 23:34:54 rwald Exp $ * ======================================================================= * Copyright (c) 2002 Axion Development Team.  All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * * 1. Redistributions of source code must retain the above *    copyright notice, this list of conditions and the following *    disclaimer. * * 2. Redistributions in binary form must reproduce the above copyright *    notice, this list of conditions and the following disclaimer in *    the documentation and/or other materials provided with the *    distribution. * * 3. The names "Tigris", "Axion", nor the names of its contributors may *    not be used to endorse or promote products derived from this *    software without specific prior written permission. * * 4. Products derived from this software may not be called "Axion", nor *    may "Tigris" or "Axion" appear in their names without specific prior *    written permission. * * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A * PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. * ======================================================================= */package org.axiondb.functions;import org.axiondb.Function;/** * An executable {@link Function}, as opposed to a {@link FunctionIdentifier}. *  * @version $Revision: 1.2 $ $Date: 2002/12/16 23:34:54 $ * @author Rodney Waldhoff */public interface ConcreteFunction extends Function {    boolean isValid();}