001/** 002 * 003 * Copyright 2003-2007 Jive Software, 2018-2021 Florian Schmaus. 004 * 005 * Licensed under the Apache License, Version 2.0 (the "License"); 006 * you may not use this file except in compliance with the License. 007 * You may obtain a copy of the License at 008 * 009 * http://www.apache.org/licenses/LICENSE-2.0 010 * 011 * Unless required by applicable law or agreed to in writing, software 012 * distributed under the License is distributed on an "AS IS" BASIS, 013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 014 * See the License for the specific language governing permissions and 015 * limitations under the License. 016 */ 017package org.jivesoftware.smack.packet; 018 019/** 020 * Interface to represent XMPP extension elements. Unlike {@link XmlElement}, every non-abstract class that implements 021 * {@link ExtensionElement} must have a static final QNAME member of the type {@link javax.xml.namespace.QName}. This 022 * allows type-safe functions like {@link StanzaView#getExtension(Class)}. Hence this is a marker interface. 023 * <p> 024 * Use this class when implementing new extension elements when possible. This means that every instance of your 025 * implemented class must represent an XML element of the same qualified name. 026 * </p> 027 * 028 * @see <a href="https://tools.ietf.org/html/rfc6120#section-8.4">RFC 6120 ยง 8.4 Extended Content</a> 029 */ 030public interface ExtensionElement extends XmlElement { 031 032}