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Internationalizing Applications
Using Unicode : Unicode support for supplementary characters : Limitations


Supplementary characters have the following restrictions:
*Width — Assume a column width of 2 for each supplementary character. This works for the HKSCS code page, but not for other supplementary characters
*Word breaking — Follow the heuristic rules already in place for UTF-8. Supplementary characters are considered as separate words, like 3-byte UTF-8 characters
*Case rules — No case transformations are applied to supplementary characters. This works for HKSCS, but not for other supplementary characters (in Unicode 3.1, Deseret characters are the only supplementary characters with case mappings)