unicode - Normalization needed after case folding -


given nfc normalized string, applying full case folding string, can assume result nfc normalized too?

i don't understand unicode standard trying tell me in quote:

normalization interacts case folding. string x, let q(x) = nfc(tocasefold(nfd(x))). in other words, q(x) result of normalizing x, case folding result, putting result normalization form nfc format. because of way normalization , case folding defined, q(q(x)) = q(x). repeatedly applying q not change result; case folding closed under canonical normalization either normalization form nfc or nfd.

a unicode string might not in nfc after case folding. example u+00df (latin small letter sharp s) followed u+0301 (combining acute accent).

x = u+00df u+0301 nfc(x) = u+00df u+0301 tocasefold(nfc(x)) = u+0073 u+0073 u+0301 nfc(tocasefold(nfc(x))) = u+0073 u+015b

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