What is the value of an undefined param

Subject: What is the value of an undefined param
From: Jonathan Asbell <jonathana@xxxxxxxxxxxxxx>
Date: Tue, 21 Mar 2000 17:39:16 -0500
If I use 

<xsl:value-of select"$v"/>

and I have not defined the variable....what is its value?  I am trying to
find a way to test if a value was entered


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