Gerard Meijssen gerard.meijssen@gmail.com writes:
Hoi, There are standards that define British English et al. It makes part of the ISO codes. We do not have to invent something like "ISO 639-3eng".
Indeed.
There is a nice tool maintained by W3C corroborator Richard Ishida to look up current IANA defined language tags, and their constituents (subtags) at:
http://rishida.net/utils/subtags/
Greetings -- Purodha