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Comparing to SQL NULL

Subject: Comparing to SQL NULL
From: "Oleg Konovalov" <olegkon@xxxxxxxxx>
Date: Mon, 24 Jul 2006 15:41:23 -0400
sql null

I am writing some XSL code processing database columns
(actually, adding a new column to the existing table in old application)
and need to handle a situation when the column does not have a value yet.
So how do I express that condition in XSL:
<xsl:when test="$v1 = 'NULL'">
... do something
or <xsl:when test="$v1 = 'NaN'">
... do something
or <xsl:when test="$v1 = ''">   ... blank string: ''
... do something
</xsl:when>  ???

Please help.

Sorry for the newbie question.
Using XSLT1.0 [and Cocoon 2.0.x]

Thank you,

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