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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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