<book xmlns:its="http://www.w3.org/2005/11/its" its:version="2.0" >
 <info>
   <its:rules xmlns:its="http://www.w3.org/2005/11/its" xmlns:xlink="http://www.w3.org/1999/xlink" version="2.0"  xlink:href="preservespace3xmlrules.xml"/>
 </info>
 <verse>
'Twas brillig, and the slithy toves
  Did gyre and gimble in the wabe;
 All mimsy were the borogoves,
  And the mome raths outgrabe.
 </verse>
</book>