COS and ZHH language system tags

[James Clark]

The list of language system tags on the Microsoft site:

http://www.microsoft.com/typography/otspec/languagetags.htm

includes:

   Corsican    COS    cos

However, this entry is missing in the ISO Open Font Format standards
(2nd edition, Amendment 2 and latest CD).  As far as I can tell, "cos"
is still a perfectly good ISO 639-2 and ISO 639-3 language code, so I
wondered whether this omission was an error.

Also in Amendment 2, ZHH is described as "Chinese, Hong Kong SAR", but
in the last CD, it is described simply as "Chinese".

James