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diff --git a/srcjar/org/apache/log4j/spi/HierarchyEventListener.java b/srcjar/org/apache/log4j/spi/HierarchyEventListener.java
new file mode 100644
index 0000000..77a0efd
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+++ b/srcjar/org/apache/log4j/spi/HierarchyEventListener.java
@@ -0,0 +1,45 @@
+/*
+ * 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.
+ */
+
+package org.apache.log4j.spi;
+
+import org.apache.log4j.Appender;
+import org.apache.log4j.Category;
+
+/**
+   Listen to events occuring within a {@link
+   org.apache.log4j.Hierarchy Hierarchy}.
+
+   @author Ceki Gülcü
+   @since 1.2
+   
+ */
+public interface HierarchyEventListener {
+
+ 
+  //public
+  //void categoryCreationEvent(Category cat);
+
+
+  public
+  void addAppenderEvent(Category cat, Appender appender);
+
+  public
+  void removeAppenderEvent(Category cat, Appender appender);
+
+
+}