Even after the atomization process when as="xs:string?" is specified?
What role does the 'as' attribute play when you get an empty sequence?
yes as Michael commented in his original reply, if the select expresssion
returns () (because the node isn't there) then if you specify that is of type
xs:string? you get () as the ? specifically allows that outcome.
If on the other hand you'd have said as="xs:string" then you'd have got
a type error as you can't atomize () to get a string.
David
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