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Smack is an Open Source XMPP (Jabber) client library for instant messaging and presence. This library provides the client side functionality as specified in the core XMPP specifications as related to the client side of said specifications.

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/**
 * $RCSfile$
 * $Revision: 7071 $
 * $Date: 2007-02-11 16:59:05 -0800 (Sun, 11 Feb 2007) $
 *
 * Copyright 2003-2007 Jive Software.
 *
 * All rights reserved. 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.
 */

package org.jivesoftware.smack.packet;

/**
 * Interface to represent packet extensions. A packet extension is an XML subdocument
 * with a root element name and namespace. Packet extensions are used to provide
 * extended functionality beyond what is in the base XMPP specification. Examples of
 * packet extensions include message events, message properties, and extra presence data.
 * IQ packets cannot contain packet extensions.
 *
 * @see DefaultPacketExtension
 * @see org.jivesoftware.smack.provider.PacketExtensionProvider
 * @author Matt Tucker
 */
public interface PacketExtension {

    /**
     * Returns the root element name.
     *
     * @return the element name.
     */
    public String getElementName();

    /**
     * Returns the root element XML namespace.
     *
     * @return the namespace.
     */
    public String getNamespace();

    /**
     * Returns the XML reppresentation of the PacketExtension.
     *
     * @return the packet extension as XML.
     */
    public String toXML();
}