==== component_descriptor

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

[source,xml]
----
<component_descriptor
    stream_content="uint4, required"
    stream_content_ext="uint4, default=0xF"
    component_type="uint8, required"
    component_tag="uint8, default=0"
    language_code="char3, required"
    text="string, optional"/>
----
