<its:rules xmlns:its="http://www.w3.org/2005/11/its" version="2.0">
 <its:locNoteRule selector="//@alt" locNoteType="description">
  <its:locNote>This text will be displayed over the image.</its:locNote>
 </its:locNoteRule>
 <its:locNoteRule locNoteType="alert" selector="//msg[@id='DisableInfo']">
  <its:locNote>The variable {0} has three possible values: 'printer', 
  'stacker' and 'stapler options'.</its:locNote>
 </its:locNoteRule>
</its:rules>