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How can you tell if a variable exists?

Subject: How can you tell if a variable exists?
From: "Scott Sanders" <scott@xxxxxxxxxxxx>
Date: Mon, 11 Oct 1999 17:11:46 -0700
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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