Copyright: Copyright 1998-2005  W3C (MIT, ERCIM, Keio), All Rights Reserved.
See http://www.w3.org/Consortium/Legal/.
Author: Aaron Cohen (Intel), Jeff Boston (IBM)
           Version: May 1, 2001
            Module: Timing and Synchronization
           Feature: Negative begin times
         File Name: simple_negative_begin.smil
  Media Components: 2 QT
 Expected Behavior: at t=5  video2 appears.
                          at t=10 video1 appears 5 seconds into the video.
                          at t=15 video1 and video2 disappear.
<smil xmlns="http://www.w3.org/2005/SMIL21/Language">
                <par begin="10s">
                        <video id="video1" begin="-5s" dur="10s"
                <video id="video2" begin="video1.begin" dur="10s"