IETF language tags were first defined in RFC 1766, edited by Harald Tveit Alvestrand, published in March 1995. It is used by computing standards such as HTTP, HTML, XML and PNG. In its accordance with ISO 639-3, however, it does not provide codes for distinguishing between Arabic-based scripts, and maintains two duplicate codes for Punjabi, as well as a number of dubious or non-existent language distinctions made by its parents standard. To distinguish language variants for countries, regions, or writing systems (scripts), IETF language tags combine subtags from other standards such as ISO 639, ISO 15924, ISO 3166-1 and UN M.49.įor example, the tag "en" stands for English "es-419" for Latin American Spanish "rm-sursilv" for Romansh Sursilvan "sr-Cyrl" for Serbian written in Cyrillic script "nan-Hant-TW" for Min Nan Chinese using traditional Han characters, as spoken in Taiwan and "gsw-u-sd-chzh" for Zürich German.
The tag structure has been standardized by the Internet Engineering Task Force (IETF) in Best Current Practice (BCP) 47 the subtags are maintained by the IANA Language Subtag Registry.
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( August 2020) ( Learn how and when to remove this template message)Īn IETF BCP 47 language tag is a standardized code or tag that is used to identify human languages in the Internet (a language code).
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