    <!--
                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 events
             File Name: interval_logic_and_events_1.smil
      Media Components: 2 QT, 1 JPG
     Expected Behavior: the smil image is shown from 0 to 20s
                        the video2 begins at 5s and plays until 15s.
                        the video1 is shown at 10s, starting 5s into the video.
                        a click before 10s will do nothing. After 10s,
                        video1 will play until a click occurs on the smil image.
                        if no click occurs between 10s and 20s, then there is no way
                        to generate the smile.activateEvent and the video
                        will play indefinitely.
    -->
    <smil xmlns="http://www.w3.org/2001/SMIL20/Language">
    <body>
            <par>
                    <img id="smile" begin="0s" dur="20s"
    src="../images/smile.jpg"/>
                    <par id="par1" begin="10s">
                            <video id="video1" begin="-5s"
    end="smile.activateEvent" src="../videos/nasa.qt"/>
                    </par>
                    <video id="video2" begin="video1.begin" dur="10s"
    src="../videos/nasa.qt"/>
            </par>
    </body>
    </smil>