==== content_labelling_descriptor

Defined by MPEG in <<ISO-13818-1>>.

[source,xml]
----
<content_labelling_descriptor
    metadata_application_format="uint16, required"
    metadata_application_format_identifier="uint32, optional"
    content_time_base_indicator="uint4, required"
    content_time_base_value="uint33, optional"
    metadata_time_base_value="uint33, optional"
    content_id="uint7, optional">

  <content_reference_id>
    Hexadecimal content
  </content_reference_id>

  <time_base_association_data>
    Hexadecimal content
  </time_base_association_data>

  <private_data>
    Hexadecimal content
  </private_data>

</content_labelling_descriptor>
----
