![]() The entries in the registry follow certain conventions with regard to upper and lower letter-casing. Language- extlang- script- region- variant-extension- privateuse We will work our way through these and how they are used in the The list below shows the various types of subtag that are available. If you have been using RFC 1766, RFC 3066, or RFC 4646 you do not need to make any changes to your tags. RFC 3066 essentially allowed you to compose language tags that were either a languageĬode on its own, a language code plus a country code, or one of a small number of specially registered values in the IANA language tag registry.Īlthough it provides some additional options for identifying common language variations, RFC 5646 includes all of there is more flexibility around the potential components of a language tag.subtags have fixed positions and lengths, which makes for easier matching of language tags. ![]()
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