If I can get past the DC math filter without reprimand,
sorry not today...
I think his point that the {} empty set is a member of
any set was the Ah-ha moment for me.
That's what allows the as="xs:string?" to succeed rather than
report the error.
The empty set isn't a _member_ of every set.
{} isn't a member of {1,2,3} for example.
It is a member of {{}} though (the set with one member, the empty set)
It is a _subset_ of every set.
David
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