==== SSU_message_descriptor

Defined by DVB in <<ETSI-102-006>>.
Must be in a UNT (table id 0x4B).

[source,xml]
----
<SSU_message_descriptor
    descriptor_number="uint4, required"
    last_descriptor_number="uint4, required"
    ISO_639_language_code="char3, required">

  <text>String</text>

</SSU_message_descriptor>
----
