You could test for existing variable by this:

<xsl:apply-templates select="your variable name" />

if it does exist then it will go to this loop

<xsl:template match="your variable name">
    ---whatever you wanted to do with the parameter
</xsl:template>

hope this help and good luck :->
Thuy

-----Original Message-----
From:	Scott Sanders [SMTP:scott@xxxxxxxxxxxx]
Sent:	Tuesday, October 12, 1999 10:12 AM
To:	xsl-list@xxxxxxxxxxxxxxxx
Subject:	How can you tell if a variable exists?

How can you tell if a variable exists (or rather does not exist), without
erroring out of the stylesheet.

For example:
  I am using the SAXON servlet to present HTML to the user.  I am passing in
the parameters from doPost to the stylesheet.  If the parameters exist, all
is well.  But when a parameter does not exist, and is not passed to the
stylesheet, I just get an exception.  How do I prevent that?

TIA,
Scott Sanders


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 XSL-List info and archive:  http://www.mulberrytech.com/xsl/xsl-list