<?xml version="1.0" encoding="utf-8" ?>
<!DOCTYPE animal SYSTEM "ibm28an01.dtd" [
   <!ELEMENT animal (cat|tiger|leopard)+>
   <!NOTATION animal_class SYSTEM "ibm29v01.txt">
   <!ELEMENT cat ANY>
   <!ENTITY forcat "This is a small cat">
   <!ELEMENT tiger (#PCDATA)>
   <!ELEMENT small EMPTY>
   <!ELEMENT big EMPTY>
   <!ATTLIST tiger color CDATA #REQUIRED>
   <?sound "This is a PI" ?>
   <!-- This is a comment -->
]>
<animal>
   <cat>&forcat;</cat>
   <tiger color="white">This is a white tiger in Mirage!!</tiger>
   <cat/>
   <leopard>
      <small/>
      <big/>
   </leopard>
</animal>