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Define IETF BCP 47 language tags (at the syntax level) #30

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Merged
jviotti merged 1 commit into from
Oct 24, 2025
Merged

Define IETF BCP 47 language tags (at the syntax level) #30

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1 change: 1 addition & 0 deletions README.markdown
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Expand Up @@ -42,6 +42,7 @@ expressed as JSON Schema definitions.
| IETF | [RFC 3986](https://www.rfc-editor.org/rfc/rfc3986) | Uniform Resource Identifier (URI): Generic Syntax |
| IETF | [RFC 4918](https://www.rfc-editor.org/rfc/rfc4918) | HTTP Extensions for Web Distributed Authoring and Versioning (WebDAV) |
| IETF | [RFC 5322](https://www.rfc-editor.org/rfc/rfc5322) | Internet Message Format |
| IETF | [RFC 5646](https://www.rfc-editor.org/rfc/rfc5646) | Tags for Identifying Languages (BCP 47) |
| IETF | [RFC 5789](https://www.rfc-editor.org/rfc/rfc5789) | PATCH Method for HTTP |
| IETF | [RFC 6901](https://www.rfc-editor.org/rfc/rfc6901) | JavaScript Object Notation (JSON) Pointer |
| IETF | [RFC 7807](https://www.rfc-editor.org/rfc/rfc7807) | Problem Details for HTTP APIs |
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50 changes: 50 additions & 0 deletions schemas/ietf/language/tag-syntax.json
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{
"$schema": "https://json-schema.org/draft/2020-12/schema",
"title": "RFC 5646 BCP 47 Language Tag",
"description": "A language tag conforming to language tag full syntax at the syntax level only",
"examples": [
"en",
"en-US",
"zh-Hans",
"sr-Latn-RS",
"de-CH-1996",
"zh-cmn-Hans-CN",
"en-US-x-twain",
"x-private"
],
"x-license": "https://github.com/sourcemeta/std/blob/main/LICENSE",
"x-links": [ "https://www.rfc-editor.org/rfc/rfc5646" ],
"type": "string",
"anyOf": [
{
"$comment": "Regular language tag: language [-script] [-region] [*-variant] [*-extension] [-privateuse]",
"pattern": "^([A-Za-z]{2,3}(-[A-Za-z]{3}){0,3}|[A-Za-z]{4}|[A-Za-z]{5,8})(-[A-Za-z]{4})?(-([A-Za-z]{2}|[0-9]{3}))?(-([0-9][a-zA-Z0-9]{3}|[a-zA-Z0-9]{5,8}))*(-[0-9A-WY-Za-wy-z](-[a-zA-Z0-9]{2,8})+)*(-[Xx](-[a-zA-Z0-9]{1,8})+)?$"
},
{
"$comment": "Private use tag: x-privateuse",
"pattern": "^[Xx](-[a-zA-Z0-9]{1,8})+$"
},
{
"$comment": "Grandfathered irregular tags (RFC 3066 legacy)",
"enum": [
"en-GB-oed",
"i-ami",
"i-bnn",
"i-default",
"i-enochian",
"i-hak",
"i-klingon",
"i-lux",
"i-mingo",
"i-navajo",
"i-pwn",
"i-tao",
"i-tay",
"i-tsu",
"sgn-BE-FR",
"sgn-BE-NL",
"sgn-CH-DE"
]
}
]
}
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