[xsl] Listing keywords

Hi all

I'm trying to get my head around the following problem... I've got a doc 
with the following structure:
<item>
   <keywords>Chair, Sofa, Cabinet</keywords>
</item>
<item>
   <keywords>Chair, Sofa</keywords>
</item>
<item>
   <keywords>Cabinet</keywords>
</item>
<item>
   <keywords>Chair</keywords>
</item>

What I need to get out of that is a list of unique keywords, eg:

<keyword>Cabinet</keyword>
<keyword>Chair</keyword>
<keyword>Sofa</keyword>

Anyone know how I can do this? I'm using XSL/XPath 1.0.

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