/* * Licensed to the Apache Software Foundation (ASF) under one or more * contributor license agreements.  See the NOTICE file distributed with * this work for additional information regarding copyright ownership. * The ASF licenses this file to You 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. */package org.apache.log4j.xml;import org.w3c.dom.Element;import java.util.Properties;/** * When implemented by an object configured by DOMConfigurator, * the handle method will be called when an unrecognized child * element is encountered.  Unrecognized child elements of * the log4j:configuration element will be dispatched to * the logger repository if it supports this interface. * * @since 1.2.15 */public interface UnrecognizedElementHandler {    /**     * Called to inform a configured object when     * an unrecognized child element is encountered.     * @param element element, may not be null.     * @param props properties in force, may be null.     * @return true if configured object recognized the element     * @throws Exception throw an exception to prevent activation     * of the configured object.     */    boolean parseUnrecognizedElement(Element element, Properties props) throws Exception;}