[xsl] test node inexistence

Subject: [xsl] test node inexistence
From: Vaduvoiu Tiberiu <vaduvoiutibi@xxxxxxxxx>
Date: Tue, 19 Jun 2007 23:31:57 -0700 (PDT)
as wierd as the subject sounds, that what I'm trying to do. How to test if there is no node or child node?
to test if a node exists you could write <xsl:if test="root/child"> but how can you test if that child doesn't exists?

one way would be the classic 

when exists...

but what I need is to do this in an if. So I need to say "if there is no child node with the name of X, do action A". How can that be done?

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