Non-existing node

Hi *,

I have a (stupid?) question:

What is returned when you try to reach a node that doesn't exist ?
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 ?

Thanks in advance,
Frank.

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