Toshio san,
thanks for your e-mail.
FULLWIDTH QUOTATION MARK, FULLWIDTH APOSTROPHE: fn:normalize-unicode("”’", "NFKC") returns ”’
As far as I can judge, the result is actually correct; it’s returned by Java’s standard Unicode algorithms, and also returned by other XQuery (Saxon, Zorba, XMLPrime, etc). I may need to do more research on how to normalize quotes the way you’d like them to have, though.
Hope this helps (at least a little), Christian