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

    <caption_service_descriptor>
      <!-- One per service -->
      <service language="char3, required"
               digital_cc="bool, required"
               line21_field="bool, optional"
               caption_service_number="uint6, required"
               easy_reader="bool, required"
               wide_aspect_ratio="bool, required"/>
    </caption_service_descriptor>

  </_descriptors>
</tsduck>
