Returns a UNormalizer2 instance which uses the specified data file (packageName/name similar to ucnv_openPackage() and ures_open()/ResourceBundle) and which composes or decomposes text according to the specified mode. Returns an unmodifiable singleton instance. Do not delete it.
Use packageName=NULL for data files that are part of ICU's own data. Use name="nfc" and UNORM2_COMPOSE/UNORM2_DECOMPOSE for Unicode standard NFC/NFD. Use name="nfkc" and UNORM2_COMPOSE/UNORM2_DECOMPOSE for Unicode standard NFKC/NFKD. Use name="nfkc_cf" and UNORM2_COMPOSE for Unicode standard NFKC_CF=NFKC_Casefold.