Copyright: Copyright 1998-2001 W3C (MIT, INRIA, Keio), All Rights Reserved.
See http://www.w3.org/Consortium/Legal/.
Author: Muriel Jourdan (Muriel.Jourdan@inrialpes.fr)
Version: Oct 11th, 2000, v1
Module: SMIL Timing & Sync Module
Feature: prev.end in a excl
File Name: prev_end_excl.smil
Media Components: 1 JPG, 1MPG(5.6s)
Expected Behavior: at t=0s the video starts for 4s 
then the smile image is shown for 4s. 
<t:excl >      
<t:video style="width:100;height:100" src="../videos/nist.mpg" id="vid" begin="0s" dur="4s" />
<t:img style="width:100;height:100" src="../images/smile.jpg" begin="prev.end" dur ="4s" id="image1" />
</t:excl>