On language tags

Hi Yves, all,

Currently the language tags are only in the techniques document, and we
refer to xml:lang. I am just wondering if we should consider a language
attribute for the tagset document (not deciding yet whether for the last
call or not), to be able to use RFC 3066 bis. This new RFC for language
tags is much more powerful than the RFC 3066 (which is the basis for
xml:lang).

Any ideas?

Cheers,

Felix