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RFC 3066 primary subtag
RFC 3066
tags are expressed as a series of 1 or more subtags separated by hyphens.
First subtag is alphabetic, usually expressed in lower case:
3 letters = ISO 639-2 3-character code for a language for which no ISO 639-1 2-character code exists
2 letters = ISO 639-1 2-character code
1 letter = either
i
for
IANA
registered codes or
x
for unregistered private codes
Indicating Text Language, slide 3 of 5
© 2006 Syd Bauman and Brown WWP