Māori (mi,mi-NZ)

Browser/toolkit peer
Konrad Dear <konrad ā dear.maori.nz> - CVS ACCESS : NO

Guidelines for use of language codes

mi
It's use is discouraged. Instead the mi-NZ language code should be used.
mi-NZ
Should refer specifically to the standard te reo Māori o Aotearoa promoted by Te Taura Whiri i te Reo Māori - The Māori Language Commission.
mi-NZ-X-<iwi or region>
Can be used to refer to a localization (translation) specific to a particular region or iwi. e.g. mi-NZ-X-tai_tokerau or mi-NZ-X-tuhoe.
This standard is still being decided upon for compatibility with Mozilla software, and is subject to change.