==== emergency_information_descriptor

Defined by ARIB in <<ARIB-B10J>>.

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

  <!-- One entry per event -->
  <event service_id="uint16, required"
         started="bool, required"
         signal_level="uint1, required">

    <!-- One entry per area code -->
    <area code="uint12, required"/>

  </event>

</emergency_information_descriptor>
----
