[xsl] Wath is the opposite of the union operator?

Subject: [xsl] Wath is the opposite of the union operator?
From: António Mota <amsmota@xxxxxxxxx>
Date: Thu, 22 Sep 2005 00:45:50 +0100
Or puting it in another way, how do i select a group of nodes selected
by some xpath expression EXCEPT the ones that are selected by another
xpath expression?

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