http://xmlgraphics.apache.org/fop/: Apache FOP (Formatting Objects Processor) is the world's first print formatter driven by XSL formatting objects (XSL-FO) and the world's first output independent formatter. It is a Java application that reads a formatting object (FO) tree and renders the resulting pages to a specified output. Output formats currently supported include PDF, PCL, PS, AFP, TIFF, PNG, SVG, XML (area tree representation), Print, AWT and TXT. The primary output target is PDF. (Apache Software Foundation) 
/*
 * 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.
 */

/* $Id: ExtensionAttachment.java 679326 2008-07-24 09:35:34Z vhennebert $ */

package org.apache.fop.fo.extensions;


This interface is implemented by objects that are returned by special extension element
through the FONode.getExtensionAttachment() method. Such objects are carried in the FO tree
and made available to the layout managers that support processing extension attachments or
support passing them on to the area tree where they can be picked up by renderers.


NOTE: Classes which implement this interface need to be Serializable!

/**
 * This interface is implemented by objects that are returned by special extension element
 * through the FONode.getExtensionAttachment() method. Such objects are carried in the FO tree
 * and made available to the layout managers that support processing extension attachments or
 * support passing them on to the area tree where they can be picked up by renderers.
 * <p>
 * NOTE: Classes which implement this interface need to be Serializable!
 */
public interface ExtensionAttachment {

    
This method returns a category URI that allows a processor (layout manager or renderer)
to determine if it supports this object.

Returns:the category URI
/**
     * This method returns a category URI that allows a processor (layout manager or renderer)
     * to determine if it supports this object.
     * @return the category URI
     */
    String getCategory();

}