> I have a (stupid?) question:
> 
> What is returned when you try to reach a node that doesn't exist ?

An empty node-set.

> Imagine the simplest xml possible:
> 
> <xml></xml>
> 
> what I would like to know is what value is returned if I try 
> to reach some
> node inside the xml, thus is:
> 
> ...
> <xsl:if test="SomeNode=Whatever">
> ...
> </xsl:if>
> ...
> 
> What is the "Whatever" compared to ?

An empty string. See http://www.w3.org/TR/xpath#booleans for more info on
comparisons.

Jarno

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