That's in spite of that fact that the function is
invoked from within a lateral fo element.
The state of the result tree is irrelevant, generate-id() depends on the
current node, in exactly the same way as . does (or any relative XPath)
In XSLT1 there is always a current node that affects XPath
processing. (In some contexts in XSLT2 the current node is undefined,
and XPath expressiosn relying on it raise an error)
David
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