[xsl] Getting nodes where attribute is not in list

Subject: [xsl] Getting nodes where attribute is not in list
From: "Bordeman, Chris" <Chris.Bordeman@xxxxxxxxxxxxxxxxx>
Date: Wed, 25 Feb 2009 09:29:59 -0600
I need to do something like $items/item[Code not in $codes] where $codes
is a sequence of strings.

How is this done?  Many thanks.

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