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

    <quality_extension_descriptor field_size_bytes="uint8, required">
      <!-- between 1 and 255 metric codes to be provied (although only 7 are defined) -->
      <metric code="uint32, required"/>
    </quality_extension_descriptor>

  </_descriptors>
</tsduck>
