Link: http://trac.tools.ietf.org/wg/httpbis/trac/ticket/13
Component: p3-payload
RFC 1766, which is referenced by RFC 2616 section 3.10 as the source for its definition of language tags has a BNF has been updated by RFC3066 (a BCP).
RFC 3066 defines these as:
Language-Tag = Primary-subtag *( "-" Subtag ) Primary-subtag = 1*8ALPHA Subtag = 1*8(ALPHA / DIGIT)
HTTP/1.1 RFC 2616 defines these as:
language-tag = primary-tag *( "-" subtag ) primary-tag = 1*8ALPHA subtag = 1*8ALPHA
In the meantime, RFC3066 has been obsoleted by RFC4646, and the original grammar production defining subtags seems to be gone:
Language-Tag = langtag / privateuse ; private use tag / grandfathered ; grandfathered registrations langtag = (language ["-" script] ["-" region] *("-" variant) *("-" extension) ["-" privateuse]) language = (2*3ALPHA [ extlang ]) ; shortest ISO 639 code / 4ALPHA ; reserved for future use / 5*8ALPHA ; registered language subtag extlang = *3("-" 3ALPHA) ; reserved for future use script = 4ALPHA ; ISO 15924 code region = 2ALPHA ; ISO 3166 code / 3DIGIT ; UN M.49 code variant = 5*8alphanum ; registered variants / (DIGIT 3alphanum) extension = singleton 1*("-" (2*8alphanum)) singleton = %x41-57 / %x59-5A / %x61-77 / %x79-7A / DIGIT ; "a"-"w" / "y"-"z" / "A"-"W" / "Y"-"Z" / "0"-"9" ; Single letters: x/X is reserved for private use privateuse = ("x"/"X") 1*("-" (1*8alphanum)) grandfathered = 1*3ALPHA 1*2("-" (2*8alphanum)) ; grandfathered registration ; Note: i is the only singleton ; that starts a grandfathered tag alphanum = (ALPHA / DIGIT) ; letters and numbers
So shouldn't RFC2616 (Section 3.10) stop defining these things, and just normatively refer to RFC4626 for the definition of "Language-Tag"?
postpone until ABNF update.
I propose to go ahead with the change independantly of the ABNF migration; we already have applied other changes to the BNF; and, after all, everything is under source control for later checks.
Proposed change.
Proposed change.
Proposal: delay until RFC4646bis is published (see http://tools.ietf.org/html/draft-ietf-ltru-4646bis-17 )