Value is language tag per RFC 1766:
'fr' ISO 639 'en-US' ISO 639 + 3166 'no-nynorsk' additional qualifier 'i-navajo' IANA registry 'x-anything' "experimental"
Case is irrelevant
Do not use period or underline as separator
RFC 1766 will be updated with ISO 639-2
(see
draft-alvestrand-lang-tags-v2-00.txt)
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