> 
> I am trying to comparing to see is a string is null,

There is no such thing as "null" in the XPath data model. Do you mean
the string is empty (zero-length?)
> 
> I have a param named userid, i want to check to see if 
> '$userid' is not null.
> 
> I tried <xsl:if test="$userid!=''>, this does'nt seem
> to help.
> 
Show us how $userid is declared.

I suspect I can guess the answer: it is a result tree fragment, not a
string.

Michael Kay


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