To be pedantic, my:f($x) is my:f($x) should always evaluate to true()
in the absence of errors. But that can be taken as read.
This is the problem it shouldn't, according to the XSLT 2.0 spec:
there are cases when
my:f($x) is my:f($x)
evaluates to false().
This happens when my:f() is defined in such a way that it creates new
node(s) on every evaluation.
Cheers,
Dimitre.
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