IETF language tag

Code to identify human languages / From Wikipedia, the free encyclopedia

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An IETF BCP 47 language tag is a standardized code or tag that is used to identify human[1] languages in the Internet (a language code). The tag structure has been standardized by the Internet Engineering Task Force (IETF) [1] in Best Current Practice (BCP) 47;[1] the subtags are maintained by the IANA Language Subtag Registry.[2][3][4]

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. For 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.

It is used by computing standards such as HTTP,[5] HTML,[6] XML[7] and PNG.[8]󠀁

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