<!doctype doc [
<!notation dcn SYSTEM>
<!notation dcn1 SYSTEM>
<!notation dcn2 SYSTEM>
<!-- These attributes are all illegal. See 11.4.1. -->
<!attlist #notation dcn
  file entity #implied
  id id #implied
  idref idref #implied
  notation notation (dcn1|dcn2) dcn1
  att1 name #current
  att2 name #conref>
<!element doc - o any>
]>
<doc>
