<sub-class-of type="text/plain"/>
    <alias type="text/x-dtd"/>
    <glob pattern="*.dtd"/>
  </mime-type>

  <mime-type type="application/xml-external-parsed-entity">
    <alias type="text/xml-external-parsed-entity"/>
  </mime-type>

  <mime-type type="application/xmpp+xml"/>
  <mime-type type="application/xop+xml">
    <glob pattern="*.xop"/>
  </mime-type>