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diff --git a/lucene-java-3.5.0/lucene/contrib/facet/src/java/org/apache/lucene/facet/index/attributes/CategoryProperty.java b/lucene-java-3.5.0/lucene/contrib/facet/src/java/org/apache/lucene/facet/index/attributes/CategoryProperty.java
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+package org.apache.lucene.facet.index.attributes;
+
+import java.io.Serializable;
+
+import org.apache.lucene.facet.index.CategoryContainer;
+
+/**
+ * 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.
+ */
+
+/**
+ * Property that can be added to {@link CategoryAttribute}s during indexing.
+ * Note that properties are put in a map and could be shallow copied during
+ * {@link CategoryAttributeImpl#clone()}, therefore reuse of
+ * {@link CategoryProperty} objects is not recommended. Also extends
+ * {@link Serializable}, making the {@link CategoryContainer} serialization more
+ * elegant.
+ * 
+ * @lucene.experimental
+ */
+public interface CategoryProperty extends Serializable {
+
+  /**
+   * When adding categories with properties to a certain document, it is
+   * possible that the same category will be added more than once with
+   * different instances of the same property. This method defined how to
+   * treat such cases, by merging the newly added property into the one
+   * previously added. Implementing classes can assume that this method will
+   * be called only with a property of the same class.
+   * 
+   * @param other
+   *            The category property to merge.
+   * @throws UnsupportedOperationException
+   *             If merging is prohibited for this property.
+   */
+  public void merge(CategoryProperty other)
+      throws UnsupportedOperationException;
+}