1 <?xml version="1.0"?>
   2 <!DOCTYPE book [
   3 <!ELEMENT book (#PCDATA | ar:rating | fr:rating | zr:rating)* >
   4 <!ATTLIST ar:rating 
   5           xmlns:ar CDATA #FIXED "http://www.amazon.com/">
   6 <!ATTLIST fr:rating 
   7           xmlns:fr CDATA #FIXED "http://www.fatbrain.com/">
   8 <!ELEMENT ar:rating (#PCDATA)>
   9 <!ELEMENT fr:rating (#PCDATA)>
  10 <!ELEMENT zr:rating (#PCDATA)>
  11 ]>
  12 <book> 
  13    <ar:rating>4star</ar:rating>
  14    <fr:rating>3star</fr:rating>
  15    <zr:rating>2star</zr:rating>
  16 </book>