If you do data munging on a fairly regular basis, you might want to consider picking up Data Munging with Perl which was written by our own davorg. There is an entire chapter devoted to the various ways of munging XML, and as a whole, the book is very enlightening.

TStanley
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It is God's job to forgive Osama Bin Laden. It is our job to arrange the meeting -- General Norman Schwartzkopf