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How to use XQuery snippet.

Hi all,
I've got quite a few xml files that I need to query and extract certain info. Is XQuery the best way to do it, or are there better ways to query xml files?
If you suggest XQuery, I have a XQuery snippet (this is from http://www.w3.org/TR/xquery/):
FOR $b IN document("bib.xml")//book
WHERE $b/publisher = "Morgan Kaufmann"
AND $b/year = "1998"
RETURN $b/title
How do I use this query snippet? Do I put it in a file? How do I run it?
Thanx in advance