[xsl] Testing a variable for node

["rowan@xxxxxxxxxxxxxxxxxxxxx" <rowan@xxxxxxxxxxxxxxxxxxxxx>]

How do I test a variable to see whether it contains a node, or something
else (usually, in the case I'm working on, an empty string)? Everything I
try causes an error if the variable contains a string. I have some code
that will only work on nodes, and before calling this code I need to test
and do something different if the variable doesn't contain a node.

Thanks - Rowan

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