On Sun, 5 Sep 2004 03:00:00 +0100 (BST), Andrew Dunbar <hippietrail(a)yahoo.com>
wrote:
Wikimedia does
use two letter ISO 639 codes and when
they do not exist they do use the three letter
codes. There are missing ISO codes. There are also
the SIL codes but personally I think mixing these
three codes makes a mess. Preferably ISO adds
missing codes for languages.
There are omissions, mergers, splits, and other
differences between ISO and SIL. ISO is more likely to
include artificial languages. SIL is more likely to
include very rare and obscure human languages. Neither
includes Klingon yet.
[snip other stuff, with which I agree]
Klingon is tlh in ISO 639.
Constructed and ancient languages are out of scope for the Ethnologue but there is an
effort to extend the Ethnologue list and produce standardized codes for them
("LINGUIST codes"); in that list Klingon is apparently CKLN (though at least one
page refers to it as CKLI).