The Unicode collation algorithm (UCA) is an algorithm defined in Unicode Technical Report #10, which is a customizable method to produce binary keys from strings representing text in any writing system and language that can be represented with Unicode. These keys can then be efficiently byte-by-byte compared in order to collate or sort them according to the rules of the language, with options for ignoring case, accents, etc.[1]

Unicode Technical Report #10 also specifies the Default Unicode Collation Element Table (DUCET), this data file specifies a default collation ordering, the DUCET is customizable for different languages.[1][2] Some such customizations can be found in the Unicode Common Locale Data Repository (CLDR).[3]

An open source implementation of UCA is included with the International Components for Unicode, ICU.[4][5] ICU supports tailoring, and the collation tailorings from CLDR are included in ICU.[6][2]

References

  1. 1 2 Whistler, Ken; Scherer, Markus; Davis, Mark (2022-08-26). "UTS #10: Unicode Collation Algorithm". Unicode. Retrieved 2023-08-16.
  2. 1 2 Hosken, Martin (2021-09-23). Unicode Sort Tailoring: Tutorial (PDF) (1.3 ed.). SIL Writing Systems Technology. pp. 2–3. Retrieved 2023-08-16.
  3. "CLDR Releases/Downloads". Unicode CLDR. Retrieved 2023-08-16.
  4. "ICU - International Components for Unicode". Unicode. Retrieved 2023-08-16.
  5. "Collations". SyBooks Online. Retrieved 2023-08-16.
  6. "Customization". ICU Documentation. Retrieved 2023-08-16.

See also

Tools

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