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RFC 3066 subsequent tags
Second subtag is alphanumeric:
3-8 letters = may be registered with IANA
2 letters (usually expressed in upper case) = ISO 3166 alpha-2 country codes
Third and subsequent subtags are alphanumeric, 1-8 characters long
Indicating Text Language, slide 4 of 5
© 2006 Syd Bauman and Brown WWP