==== dtg_guidance_descriptor

Defined by DTG in <<DTG-DBOOK>>.

[source,xml]
----
<dtg_guidance_descriptor
    guidance_type="uint2, required"
    ISO_639_language_code="char3, optional"
    text="string, optional"
    guidance_mode="bool, optional">

  <reserved_future_use>
    Hexadecimal content
  </reserved_future_use>

</dtg_guidance_descriptor>
----
