Re: Forms for subtag kmpre20c

> The concept of macrolanguages was introduced as a means to harmonize ISO639 part 1 and 2 with the new part 3 in the early 2000s, as in some cases in the Ethnologue (basis for ISO 639-3) there were several entries where ISO 639 1/2 only had one, as in the case of zh. SIL International, the editor of Ethnologue and maintenance agency for part 3, does not intend to introduce further macrolanguage-codes, but your examples with Tibetan and Khmer may be good cases for rethinking that policy.  If there are indeed orally mutually unintelligible languages whose written texts are virtually undistinguishable, that would exactly be a good case for introducing a new macrolanguage, as you suggest. I would submit such a request, well substantiated. Gary and Melinda are in CC; they would be the people w
 ho would oversee the decision process.  Perhaps they have an opinion right away.

Thanks a lot for the explanation and the support, that's very
encouraging! I'll try to find a window to work on a proper request.

Best,
-- 
Elie