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What is ISO 639-3?

ISO 639-3 codes are codes for the representation of names of languages. ISO 639-3 attempts to provide as complete an enumeration of languages as possible, including living, extinct, ancient, and constructed languages, whether major or minor, written or unwritten. More information can be found at http://www.sil.org/iso639-3/.

Who controls ISO 639-3?

The ISO does but, you can contact the registrar, SIL International.