IETF language tag

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An IETF BCP 47 language tag is a standardized code that is used to identify human languages on the Internet. 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. 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 Minnan using traditional Han characters, as spoken in Taiwan; yue-Hant-HK for Cantonese using traditional Han characters, as spoken in Hong Kong; and gsw-u-sd-chzh for Zürich German. It is used by computing standards such as HTTP, HTML, XML and PNG.