[xsl] Find a value in a variable

Subject: [xsl] Find a value in a variable
From: "cruscio\@libero\.it" <cruscio@xxxxxxxxx>
Date: Thu, 7 Dec 2006 19:22:13 +0100
Hi,
how can I determine if a value is contained in a another variable value?

example:

$a = "a,b,c,d"
$b = "b,c"

this statement seems not working:
 <xsl:if test="not(contains($a, $b))">

Could you please help?

Thanks
Carlos


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