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diff --git a/framework/src/ant/apache-ant-1.9.6/src/main/org/apache/tools/ant/SubBuildListener.java b/framework/src/ant/apache-ant-1.9.6/src/main/org/apache/tools/ant/SubBuildListener.java
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+++ b/framework/src/ant/apache-ant-1.9.6/src/main/org/apache/tools/ant/SubBuildListener.java
@@ -0,0 +1,58 @@
+/*
+ *  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.tools.ant;
+
+/**
+ * Instances of classes that implement this interface can register
+ * to be also notified when things happened during a subbuild.
+ *
+ * <p>A subbuild is a separate project instance created by the
+ * <code>&lt;ant&gt;</code> task family.  These project instances will
+ * never fire the buildStarted and buildFinished events, but they will
+ * fire subBuildStarted/ and subBuildFinished.  The main project
+ * instance - the one created by running Ant in the first place - will
+ * never invoke one of the methods of this interface.</p>
+ *
+ * @see BuildEvent
+ * @see Project#addBuildListener(BuildListener)
+ *
+ * @since Ant 1.6.2
+ */
+public interface SubBuildListener extends BuildListener {
+
+    /**
+     * Signals that a subbuild has started. This event
+     * is fired before any targets have started.
+     *
+     * @param event An event with any relevant extra information.
+     *              Must not be <code>null</code>.
+     */
+    void subBuildStarted(BuildEvent event);
+
+    /**
+     * Signals that the last target has finished. This event
+     * will still be fired if an error occurred during the build.
+     *
+     * @param event An event with any relevant extra information.
+     *              Must not be <code>null</code>.
+     *
+     * @see BuildEvent#getException()
+     */
+    void subBuildFinished(BuildEvent event);
+}