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CLDR-17265 Document special script codes #3594

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Apr 2, 2024
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CLDR-17265 Document special script codes #3594

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CLDR-17265 Document special script codes
macchiati Apr 2, 2024
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CLDR-17265 Merge: XCG fix
srl295 Apr 2, 2024
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31 changes: 31 additions & 0 deletions docs/ldml/tr35.md
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Expand Up @@ -698,6 +698,37 @@ Private use codes fall into three groups.

See also _[Unknown or Invalid Identifiers](#Unknown_or_Invalid_Identifiers)_.

### Special Script Codes
Certain valid script code require special handling.
These are the codes in [Script Codes](https://www.unicode.org/iso15924/iso15924-codes.html) with the words "variant" or "alias" within parentheses,
excluding Zsye.
The Compound codes include characters in multiple scripts;
the Visual variants are distinct in appearance, but otherwise encompass a single script;
and the Subsets exclude certain characters from a script.
The Equivalents for Subsets are not as well defined, so the "Equivalents" are marked as approximate.

| Group | Script | Equivalent |
| --- | --- | --- |
| Compounds | Jpan | ≡ Hani ∪ Hira ∪ Kana |
| | Hrkt | ≡ Hira ∪ Kana |
| | Kore | ≡ Hani ∪ Hang |
| | Hanb | ≡ Hani ∪ Bopo |
| Visual variants | Aran | ≡ Arab (Nastaliq variant) |
| | Cyrs | ≡ Cyrl (Old Church Slavonic variant) |
| | Latf | ≡ Latn (Fraktur variant) |
| | Latg | ≡ Latn (Gaelic variant) |
| | Syrn | ≡ Syrc (Eastern variant) |
| | Syre | ≡ Syrc (Estrangelo variant) |
| | Syrj | ≡ Syrc (Western variant) |
| Subsets (approximate) | Jamo | ≃ Hang - LVT - LV |
| | Hans | ≃ Hani - Traditional-only |
| | Hant | ≃ Hani - Simplified-only |

The special codes most frequently used are in the locale identifiers zh-Hans, zh-Hant, ja-Jpan, and ko-Kore.
These are used, for example, in [Likely Subtags](#Likely_Subtags) in LDML.
Some of the special codes are used in other specifications,
such as in [Mixed_Script_Detection](https://unicode.org/reports/tr39/#Mixed_Script_Detection).

<a name="Locale_Extension_Key_and_Type_Data"></a>
### <a name="u_Extension" href="#u_Extension">Unicode BCP 47 U Extension</a>

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