SWI-Prolog -- unicode

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Predicate unicode_nfd/2

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Documentation
- Reference manual
- Packages
  - SWI-Prolog Unicode library
    - library(unicode): Unicode string handling

Availability::- use_module(library(unicode)).(can be autoloaded)

[det]unicode_nfd(+In, -Out)

Characters in In are decomposed by canonical equivalence (NFD). Precomposed characters expand into base + combining marks. For example U+00C5 (LATIN CAPITAL LETTER A WITH RING ABOVE) becomes the two-code sequence A + U+030A.

See also: http://www.unicode.org/reports/tr15/