问题
(changed title so as not to confuse future readers)
Is this an authoritative list of languages I can use for my application?
From: http://en.wikipedia.org/wiki/ISO_639-1 --> http://www.infoterm.info/standardization/iso_639_1_2002.php
ISO Language Codes
ISO 639-1:2002
Codes for the representation of names of languages -- Part 1: Alpha-2 code
Infoterm has been designated the Registration Authority (ISO 639-1/RA) for the language alpha-2 language code contained in ISO 639-1:2002 "Codes for the representation of names of languages - Part 1: Alpha-2 code / Codes pour la représentation des noms de langue - Partie 1 : Code alpha-2".
回答1:
-1 is old. -3 is newer and more complete.
回答2:
I would love to be able to localize my Android apps using ISO 639-3. That however the underlying system permit localization in the ISO 639-1 list only. This means that I can't use the built in localisation for minor languages like Yolngu Matha and other Australian languages.
So, it really depends on the underlying system you are developing for, if you can utilize 639-3, 639-3 or not. I have not fund any big support for 639-3, except in linguistics software.
来源：https://stackoverflow.com/questions/5867897/using-iso-639-2-or-iso-639-3-as-authoritative-languages-list