how to extract words from a text

hello again,

I hope you can help me with this one just as well, as with my other
question today! :)

i have a xml document
<root>
<text>This is a text, that is a text</text>
</root>

and I need to extract every word from it - once, ignoring case, and
ordered by ocurrence, stripping 1-2 letter words - to make a meta
keywords tag from it...

<meta name="keywords" content="text, that, this"/>

the horror! the horror! I have no idea how to do this! :)

thanks again!
-- 
Jan
http://www.limpens.com

Otakoo Saloon Cartoon - newest episode at http://limpens.com/oscredirect