<par id="identifier"
     title="string"
     abstract="string"
     author="string"
     copyright="string"
     begin="clock-value"
     end="clock-value"
     dur="clock-value"
     end-sync="identifier|last|first"
     repeat="integer"
     system-bitrate="integer"
     system-captions="on|off"
     system-language="coma-separated-list"
     system-overdub-or-captions="captions|overdub"
     system-required="string"
     system-screen-depth="integer"
     system-screen-size="integerXinteger" />