    <!--
                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 events and pruning
             File Name: interval_logic_events_pruning_1.smil
      Media Components: 1 QT, 1 JPG
     Expected Behavior: at t=5  video1 starts from the beginning.
                              at t=7  video1 disappears.
                              at t=10 smile appears.
                              at t=10 video2 starts from the beginning.
                              at t=11 smile disappears.
                            at t=12 video2 disappears.
                            at t=13 smile appears.
                            at t=13 video1 starts from the beginning again.
                              at t=13 video2 starts from the beginning again.
                              at t=15 video1 disappears.
                            at t=15 video2 disappears.
                            at t=19 smile disappears.
    This is a modification of example in SMIL 2.0 spec section:
            10.5.2 Events and event model.
            Modified the duration of the smile image.
    -->
    <smil xmlns="http://www.w3.org/2001/SMIL20/Language">
    <body>
            <par>
                    <par id="par1" begin="10s">
                            <img id="smile" begin="-5;3s" dur="6s"
    src="../images/smile.jpg"/>
                    </par>
                    <video id="video1" begin="smile.begin" dur="2s"
    src="../videos/nasa.qt"/>
                    <video id="video2" begin="smile.beginEvent" dur="2s"
    src="../videos/nasa.qt"/>
            </par>
    </body>
    </smil>