Unicode collation algorithm

The Unicode collation algorithm (UCA) is an algorithm defined in Unicode Technical Report #10, which defines a customizable method to compare two strings. These comparisons can then be used to collate or sort text in any writing system and language that can be represented with Unicode.

Unicode Technical Report #10 also specifies the Default Unicode Collation Element Table (DUCET). This datafile specifies the default collation ordering. The DUCET is customizable for different languages. Some such customisations can be found in Common Locale Data Repository (CLDR).

An important open source implementation of UCA is included with the International Components for Unicode, ICU. ICU also supports tailoring and the collation tailorings from CLDR are included in ICU. You can see the effects of tailoring and a large number of language specific tailorings in the on-line ICU Locale Explorer.

External links and references

Unicode Collation Algorithm: Unicode Technical Standard #10
Mimer SQL Unicode Collation Charts
MySQL UCA-based Unicode Collation Charts

Tools

ICU Locale Explorer An online demonstration of the Unicode Collation Algorithm using International Components for Unicode
msort A sort program that provides an unusual level of flexibility in defining collations and extracting keys.
OpenRTL A library of functions using Unicode collation based on the Unicode collation algorithm. Also supports the customized Unicode collations for the locales defined by CLDR.

Unicode

Code points

Characters

Special purpose	BOM Combining Grapheme Joiner Left-to-right mark / Right-to-left mark Soft hyphen Word joiner Zero-width joiner Zero-width non-joiner Zero-width space

Lists	Characters CJK Unified Ideographs Combining character Duplicate characters Numerals Scripts Spaces Symbols Halfwidth and fullwidth

Processing

Algorithms	Bi-directional text Collation ISO 14651 Equivalence

Comparison	BOCU-1 CESU-8 Punycode SCSU UTF-1 UTF-7 UTF-8 UTF-9/UTF-18 UTF-16/UCS-2 UTF-32/UCS-4 UTF-EBCDIC

On pairs of
code points

Usage

Related standards

Related topics

Scripts and symbols in Unicode

Common and inherited scripts	Combining marks Diacritics Punctuation Space

Modern scripts	Arabic diacritics Armenian Balinese Bamum Batak Bengali Bopomofo Braille Buhid Burmese Canadian Aboriginal Chakma Cham Cherokee CJK Unified Ideographs (Han) Cyrillic Deseret Devanagari Ge'ez Georgian Greek Gujarati Gurmukhī Hangul Hanja Hanunó'o Hebrew diacritics Hiragana Javanese Kanji Kannada Katakana Kayah Li Khmer Khudawadi Lao Latin Lepcha Limbu Lisu (Fraser) Lontara Malayalam Mandaic Meetei Mayek Mende Kikakui Miao (Pollard) Mongolian Mro N'Ko New Tai Lue Ol Chiki Oriya Osmanya Pahawh Hmong Pau Cin Hau Rejang Samaritan Śāradā Saurashtra Shavian Sinhala Sorang Sompeng Sundanese Sylheti Nagari Syriac Tagalog (Baybayin) Tagbanwa Tai Le Tai Tham Tai Viet Takri Tamil Telugu Thaana Thai Tibetan Tifinagh Tirhuta Vai Varang Kshiti Yi

Ancient and historic scripts	Ahom Anatolian hieroglyphs Ancient North Arabian Avestan Bassa Vah Brāhmī Carian Caucasian Albanian Coptic Cuneiform Cypriot Egyptian hieroglyphs Elbasan Glagolitic Gothic Grantha Hatran Imperial Aramaic Inscriptional Pahlavi Inscriptional Parthian Kaithi Kharosthi Khojki Linear A Linear B Lycian Lydian Mahajani Manichaean Meroitic Modi Multani Nabataean Ogham Old Hungarian Old Italic Old Permic Old Persian cuneiform Old Turkic Palmyrene 'Phags-pa Phoenician Psalter Pahlavi Runic Siddham South Arabian Ugaritic

Notational scripts	Duployan SignWriting

Symbols	Cultural, political, and religious symbols Currency Mathematical operators and symbols Phonetic symbols (including IPA) Emoji

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Unicode collation algorithm

See also

External links and references

Tools