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/*
* 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.
*/
/* $Id$ */
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.
* <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.
* @return the category URI
*/
String getCategory();
}
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