[xslt] Saxon implementation article

[Matt Sergeant <matt sergeant org>]

In case you want to consider XSLT optimisations, Michael Kay has written a
really good article about the implementation of Saxon.

http://www-106.ibm.com/developerworks/library/x-xslt2/?dwzone=x?open&l=132,t=gr,p=saxon

Lots of very interesting stuff in there, particularly about how he
optimises XPath queries. I personally have only implemented one of these
optimisations in XML::XPath, and it's given me some ideas about other
things I could do.

-- 
<Matt/>

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