How to add 2 letter language code in ISO 639-1

[Arthur Reutenauer]

> "A language code already in ISO 639-2 at the point of freezing ISO 639-1
> shall not later be added to ISO 639-1. This is to ensure consistency in
> usage over time, since users are directed in Internet applications to
> employ the alpha-3 code when an alpha-2 code for that language is not
> available."

  Note however that Chakma [ccp] is not in ISO 639-2, only -3, although
I suppose that the policy applies to -3 as well.

	http://www-01.sil.org/iso639-3/documentation.asp?id=ccp

  Best,

		Arthur