Description:
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The difference between the Decomposition_Mapping property and decomposition via methods like NFKC normalization is that the latter decomposes characters recursively. It's useful in some situations to access the property directly (e.g. when implementing some PRECIS profiles[1].)

ICU exposes the Decomposition_Mapping property via unorm2_getRawDecomposition() when given a NFKC Normalizer2 instance.[2][3]

For example, given U+FFDA[4] it should return U+3161[5] rather than the full (recursive) decomposition to U+1173[6]


[1] https://tools.ietf.org/html/rfc8265#section-3.3.1
[2] http://userguide.icu-project.org/strings/properties
[3] http://icu-project.org/apiref/icu4c/unorm2_8h.html#a0551019637648af4638435d79f24be17
[4] http://www.fileformat.info/info/unicode/char/FFDA/index.htm
[5] http://www.fileformat.info/info/unicode/char/3161/index.htm
[6] http://www.fileformat.info/info/unicode/char/1173/index.htm