What is the relationship between the Internet RFC 3066 (and its predecessor RFC 1766) and the ISO 15924 standards?
The Internet RFC 3066 (Tags for the Identification of Languages), which replaces RFC 1766, describes a language tag for use in cases where it is desired to indicate the language used in an information object, how to register values for use in this language tag, and a construct for matching such language tags. It is considered an Internet Best Current Practices for the Internet Community and gives guidance for the use of ISO 15924 codes. RFC 3066 specifies use of a 2-character code from ISO 15924 when it exists; when a language does not have a 2-character code assigned the 3-character code is used. Although it states that the 3-character terminology code is used in these cases where no 2-character code exists, this situation will not occur, since the only variant codes in ISO 15924 are for languages that already have a 2-character code. The RFC also specifies the use of optional subtags (e.g. a country code from ISO 3166) and how to register dialect or variant information with IANA when
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