relaton/relaton-ietf

<?xml version="1.0" encoding="UTF-8"?>
<grammar xmlns="http://relaxng.org/ns/structure/1.0">
  <include href="basicdoc.rng"/>
  <include href="relaton-ietf.rng"/>
  <start>
    <choice>
      <ref name="bibitem"/>
      <ref name="bibdata"/>
    </choice>
  </start>
</grammar>