Copyright: Copyright 1998-2001 W3C (MIT, INRIA, 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: Interval logic and negative begin times
         File Name: interval_logic_and_negative_begin.smil
  Media Components: 2 QT
 Expected Behavior: videos never appear, the document duration is 10s.
<smil xmlns="http://www.w3.org/2001/SMIL20/Language">
                        <par id="par2" begin="10s">
                                <video id="video1" begin="-5s" dur="3s"
                        <video id="video2" begin="video1.begin" dur="10s"