Internationalization Core Working Group-ISSUE-4: Language tag references [WOFF]

Internationalization Core Working Group-ISSUE-4: Language tag references [WOFF]

http://www.w3.org/International/track/issues/4

Raised by: Richard Ishida
On product: WOFF

6.2.1 Extended Metadata Block
http://www.w3.org/TR/WOFF/#Metadata

WG Reviewed: Yes

"The possible values for the lang attribute can be found in the IANA Subtag Registry [Subtag]."

This implies that you can only use single subtags, since that is what the registry contains (with the exception of a few undesirable redundant and grandfathered tags.)  

We think this should actually say:

"The possible values for the lang attribute MUST conform to BCP 47."

An there should be an entry for BCP 47 in the  References section.

Similarly, the sentence

" A user agent displaying metadata is expected to choose a preferred language/locale to display from among those available, following RFC 4647 [RFC-4647]."

Would be better as 

"A user agent displaying metadata is expected to choose a preferred language/locale to display from among those available,  following a matching algorithm such as the lookup algorithm specified in BCP 47 (currently RFC 4647)."