[xsl] Kleene Operators

Subject: [xsl] Kleene Operators
From: Terry Badger <terry_badger@xxxxxxxxx>
Date: Sun, 28 Feb 2010 11:48:34 -0800 (PST)
I have been using Michael Kay's XSLT book and see that the regex, XSL and DTD
occurrence operators are defined in set theory. I wonder how important this is
when we use them. I guess my question is: does something very useful happen as
the result of using these operators in XML activities that would not have
happened had we used something else?

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