testing for existence of variables?

Subject: testing for existence of variables?
From: Matthew Haughey <matt@xxxxxxxxxxx>
Date: Tue, 20 Jun 2000 12:33:27 -0700
I'm building up a discussion forum in XML & XSL and was wondering about the limits of XSL, and where I should separate the scripting in XSL from the scripting in the server-side language I'm using for the site (ASP in this case).

The XML content file will be dynamically generated, and if the visitor to the site has a cookie with their ID, the XML file will contain their user information in addition to the page content (it will look like this <user><id>1234</id></user>).

When I transform the content with XSL, I'd like to display a form field for posting comments to logged in users, and if they are not logged in, display a "login here" link.

What I want to know is, can I check for the existence of the <user> information and display some HTML if it exists, and otherwise present alternate HTML? Or should this check be done on the server side in the scripting layer instead?


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