<?xml version="1.0" encoding="UTF-8"?>
<tsduck>
  <_descriptors>

    <STC_reference_descriptor
        STC_reference_mode="uint4, required"
        external_event_id="uint16, optional"
        external_service_id="uint16, optional"
        external_network_id="uint16, optional"
        NPT_reference="uint33, optional"
        STC_reference="uint33, optional"
        time_reference="hh:mm:ss, optional"
        time_reference_extension="mmm, optional">
      <reserved_data>
        Hexadecimal content
      </reserved_data>
    </STC_reference_descriptor>

  </_descriptors>
</tsduck>
