==== content_identifier_descriptor

Defined by DVB in <<ETSI-102-323>>.

[source,xml]
----
<content_identifier_descriptor>

  <!-- One per CRID -->
  <crid crid_type="uint6, required"
        crid_location="uint2, required"
        crid_ref="uint16, optional"
        crid="string, optional"/>

</content_identifier_descriptor>
----
