==== audio_preselection_descriptor

Defined by DVB in <<ETSI-300-468>>.

[source,xml]
----
<audio_preselection_descriptor>
  <!-- One entry per preselection, up to 31 preselections -->
  <preselection
      preselection_id="uint5, required"
      audio_rendering_indication="uint3, required"
      audio_description="bool, default=false"
      spoken_subtitles="bool, default=false"
      dialogue_enhancement="bool, default=false"
      interactivity_enabled="bool, default=false"
      ISO_639_language_code="char3, optional"
      message_id="uint8, optional">
    <multi_stream_info>
      <!-- One per auxiliary component, up to 7 components -->
      <component tag="uint8, required"/>
    </multi_stream_info>
    <future_extension>
      Hexadecimal content
    </future_extension>
  </preselection>
</audio_preselection_descriptor>
----
