285463 - different language tags for the same language should be considered equivalent

Status: RESOLVED INVALID

(Core :: CSS Parsing and Computation, defect)

Description

[Anne (:annevk)]

See:
 <http://www.loc.gov/standards/iso639-2/englangn.html#two>

Simple CSS testcase coming up to prove we do otherwise.

I guess we need some kind of mapping table and normalize all the values to a
sensible default for comparison. (This might be the wrong component by the way
since it also affects the HTTP language headers. They might need separate bugs.)

Comment 1

[Anne (:annevk)]

Attachment: testcase

Comment 2

[Simon Montagu :smontagu]

Personally I think this is WONTFIX. Three-letter codes equivalent to existing
two-letter codes are invalid according to both RFC 3066
(http://www.ietf.org/rfc/rfc3066.txt) and the current draft of its successor
(http://www.ietf.org/internet-drafts/draft-phillips-langtags-10.txt). I think
that the criteria for what we should support are the RFCs and the IANA registry,
rather than ISO 639.

Comment 3

[Anne (:annevk)]

From the RFC:

> When a language has both an ISO 639-1 2-character code and an ISO
> 639-2 3-character code, you MUST use the tag derived from the ISO
> 639-1 2-character code.

So this is INVALID.