==== Cable Emergency Alert Table (SCTE 18)

Defined by ANSI/SCTE in <<SCTE-18>>.

[source,xml]
----
<cable_emergency_alert_table
    sequence_number="uint5, required"
    protocol_version="uint8, default=0"
    EAS_event_ID="uint16, required"
    EAS_originator_code="char3, required"
    EAS_event_code="string, required"
    alert_message_time_remaining="uint8, optional"
    event_start_time="YYYY-MM-DD hh:mm:ss, optional"
    event_duration="uint16, optional"
    alert_priority="uint4, required"
    details_OOB_source_ID="uint16, optional"
    details_major_channel_number="uint10, optional"
    details_minor_channel_number="uint10, optional"
    audio_OOB_source_ID="uint16, optional">

  <!-- Optional ATSC multiple_string_structure() containing one or more strings -->
  <nature_of_activation_text>
    <string language="char3, required" text="string, required"/>
  </nature_of_activation_text>

  <!-- Optional ATSC multiple_string_structure() containing one or more strings -->
  <alert_text>
    <string language="char3, required" text="string, required"/>
  </alert_text>

  <!-- From 1 to 31 location structures -->
  <location
      state_code="uint8, required"
      county_subdivision="uint4, required"
      county_code="uint10, required"/>

  <!-- Up to 255 exception structures -->
  <!-- Specify either exception_major_channel_number+exception_minor_channel_number -->
  <!-- or exception_OOB_source_ID -->
  <exception
      exception_major_channel_number="uint10, optional"
      exception_minor_channel_number="uint10, optional"
      exception_OOB_source_ID="uint16, optional"/>

  <DESCRIPTOR_LIST>

</cable_emergency_alert_table>
----
