The locator xlink:href attribute


<CLASS_SLIDE xmlns:xlink="http://www.w3.org/1999/xlink"
  xlink:type="simple"
  xlink:show="new"
  xlink:href="http://www.cs.rpi.edu/~puninj/XMLJ/classes.xml#        
  				xpointer(/child::*[position()=8]/child::*[position()=first()])">
  XLinks and XPointers
</CLASS_SLIDE>