> But can't see how to get the word position whilst tokenizing the 
> whole lot? Everything I try doesn't work.
> 

I think the clue here is that you need a data structure consisting of a list
of (word, position) pairs. As soon as you need more than a linear sequence,
it's probably a good idea to use a temporary tree. So you probably want
something like:

<xsl:variable name="words">
  <xsl:for-each select="tokenize(...)">
    <word value="{.}" position="{position()}"/>
  </
</

and then do further processing on this tree.

Michael Kay