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diff --git a/src/main/java/org/w3c/dom/smil/ElementTimeManipulation.java b/src/main/java/org/w3c/dom/smil/ElementTimeManipulation.java
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+/*
+ * Copyright (c) 2000 World Wide Web Consortium,
+ * (Massachusetts Institute of Technology, Institut National de
+ * Recherche en Informatique et en Automatique, Keio University). All
+ * Rights Reserved. This program is distributed under the W3C's Software
+ * Intellectual Property License. This program is distributed in the
+ * hope that it will be useful, but WITHOUT ANY WARRANTY; without even
+ * the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
+ * PURPOSE. See W3C License http://www.w3.org/Consortium/Legal/ for more
+ * details.
+ */
+
+package org.w3c.dom.smil;
+
+import org.w3c.dom.DOMException;
+
+/**
+ *  This interface support use-cases commonly associated with animation.  
+ * "accelerate" and "decelerate" are float values in the timing draft and 
+ * percentage values even in this draft if both of them represent a 
+ * percentage. 
+ */
+public interface ElementTimeManipulation {
+    /**
+     *  Defines the playback  speed of element time. The value is specified as 
+     * a multiple of normal (parent time container) play speed.  Legal values 
+     * are signed floating point values.  Zero values are not allowed.  The 
+     * default is <code>1.0</code> (no modification of speed). 
+     * @exception DOMException
+     *    NO_MODIFICATION_ALLOWED_ERR: Raised if this attribute is readonly. 
+     */
+    public float getSpeed();
+    public void setSpeed(float speed)
+                            throws DOMException;
+
+    /**
+     *  The percentage value of the  simple acceleration of time for the 
+     * element. Allowed values are from <code>0</code> to <code>100</code> . 
+     * Default value is <code>0</code> (no acceleration). 
+     * <br> The sum of the values for accelerate and decelerate must not exceed
+     *  100. If it does, the deceleration value will be reduced to make the 
+     * sum legal. 
+     * @exception DOMException
+     *    NO_MODIFICATION_ALLOWED_ERR: Raised if this attribute is readonly. 
+     */
+    public float getAccelerate();
+    public void setAccelerate(float accelerate)
+                            throws DOMException;
+
+    /**
+     *  The percentage value of the  simple decelerate of time for the 
+     * element. Allowed values are from <code>0</code> to <code>100</code> . 
+     * Default value is <code>0</code> (no deceleration). 
+     * <br> The sum of the values for accelerate and decelerate must not exceed
+     *  100. If it does, the deceleration value will be reduced to make the 
+     * sum legal. 
+     * @exception DOMException
+     *    NO_MODIFICATION_ALLOWED_ERR: Raised if this attribute is readonly. 
+     */
+    public float getDecelerate();
+    public void setDecelerate(float decelerate)
+                            throws DOMException;
+
+    /**
+     *  The  autoReverse attribute controls the "play forwards then backwards" 
+     * functionality. Default value is <code>false</code> . 
+     * @exception DOMException
+     *    NO_MODIFICATION_ALLOWED_ERR: Raised if this attribute is readonly. 
+     */
+    public boolean getAutoReverse();
+    public void setAutoReverse(boolean autoReverse)
+                            throws DOMException;
+
+}
+