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

    <content_descriptor>
      <!-- One per classification -->
      <content content_nibble_level_1="uint4, required"
               content_nibble_level_2="uint4, required"
               user_byte="uint8, required"/>
    </content_descriptor>

  </_descriptors>
</tsduck>
