Status of RFC 20 (was: Re: Gen-ART and OPS-Dir review of draft-ietf-json-text-sequence-09)
John C Klensin <john-ietf@jck.com> Sat, 06 December 2014 03:52 UTC
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Date: Fri, 05 Dec 2014 22:51:48 -0500
From: John C Klensin <john-ietf@jck.com>
To: Barry Leiba <barryleiba@computer.org>, "Black, David" <david.black@emc.com>
Subject: Status of RFC 20 (was: Re: Gen-ART and OPS-Dir review of draft-ietf-json-text-sequence-09)
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Barry (and IESG generally), This has come up multiple times and will undoubtedly keep coming up, especially since RFC 20 is a stable reference to one particular version of ASCII and actually includes the code tables while X3.4-1968 (the version to which it refers) is largely unobtainable today (only the current version is) and ANSI X3.4, aka ANSI/INCITS 4, is not a stable reference without a date. Most, perhaps all, versions of ANSI X3.4 (and ANSI/INCITS 4) also specify the repertoire and coding, i.e., the CCS, but not what we would call the encoding form today (in the case of RFC 20, the familiar "seven bits in and eight bit byte with high order bit always zero"). So, for most IETF purposes, RFC 20 really should be the normative reference for ASCII (or, if one prefers, "US-ASCII"). RFC 20 has status "Unknown" only because it comes from a time that predates both the IETF and our use of the term "standard" (with or without qualifications) to describe Internet technical specifications. So, rather than go through a discussion about downrefs and the like every time RFC 20 is referenced from a Standards-Track specification, I suggest that the IESG reclassify it to Internet Standard and waste as little more time doing so as possible. The implementation report is that, whether they explicitly reference RFC 20 or not, substantially every application-layer protocol we have depends on the ASCII CCS and encoding form specified in that RFC. In addition, RFC 5234 and its predecessors are heavily dependent on ASCII so that substantially any specification that depends on ABNF is also an ASCII implementation. Thanks, john --On Friday, December 05, 2014 17:38 -0500 Barry Leiba <barryleiba@computer.org> wrote: > Hi, David. One note on your review: > >> idnits didn't like the reference to RFC 20 for ASCII: >> >> ** Downref: Normative reference to an Unknown state RFC: >> RFC 20 >> >> RFC 5234 (ABNF) uses this, which looks like a better >> reference: >> >> [US-ASCII] American National Standards Institute, "Coded >> Character Set -- 7-bit American Standard Code for >> Information Interchange", ANSI X3.4, 1986. > > Except that (1) many IETF documents do use RFC 20 and (2) the > RFC 20 reference is not for ASCII: it's for RS, the Record > Separator character, which is explained in RFC 20, Section 5.2. > > Barry >
- Gen-ART and OPS-Dir review of draft-ietf-json-tex… Black, David
- Re: Gen-ART and OPS-Dir review of draft-ietf-json… Barry Leiba
- RE: Gen-ART and OPS-Dir review of draft-ietf-json… Black, David
- Re: Status of RFC 20 (was: Re: Gen-ART and OPS-Di… John Levine
- Status of RFC 20 (was: Re: Gen-ART and OPS-Dir re… John C Klensin
- Re: Status of RFC 20 (was: Re: Gen-ART and OPS-Di… Stewart Bryant (stbryant)
- Re: Status of RFC 20 (was: Re: Gen-ART and OPS-Di… John C Klensin
- Re: Status of RFC 20 (was: Re: Gen-ART and OPS-Di… Stephen Farrell
- Re: Status of RFC 20 (was: Re: Gen-ART and OPS-Di… John C Klensin
- Re: Status of RFC 20 (was: Re: Gen-ART and OPS-Di… Stephen Farrell
- Re: Status of RFC 20 Brian E Carpenter
- Re: Status of RFC 20 (was: Re: Gen-ART and OPS-Di… l.wood
- Re: Status of RFC 20 (was: Re: Gen-ART and OPS-Di… John C Klensin
- Re: Status of RFC 20 (was: Re: Gen-ART and OPS-Di… l.wood
- Re: Status of RFC 20 (was: Re: Gen-ART and OPS-Di… Dave Cridland
- Re: Status of RFC 20 (was: Re: Gen-ART and OPS-Di… Barry Leiba
- Re: Gen-ART and OPS-Dir review of draft-ietf-json… Patrik Fältström
- Re: Status of RFC 20 (was: Re: Gen-ART and OPS-Di… Phillip Hallam-Baker
- Re: Status of RFC 20 Carsten Bormann
- Re: Gen-ART and OPS-Dir review of draft-ietf-json… Pete Resnick
- Re: [Json] Gen-ART and OPS-Dir review of draft-ie… Patrik Fältström
- Re: Status of RFC 20 joel jaeggli
- Re: Status of RFC 20 John C Klensin
- Re: Status of RFC 20 joel jaeggli
- RE: [Json] Gen-ART and OPS-Dir review of draft-ie… Black, David
- Re: [Json] Gen-ART and OPS-Dir review of draft-ie… Patrik Fältström
- Re: [Json] Gen-ART and OPS-Dir review of draft-ie… Patrik Fältström
- Re: [Json] Gen-ART and OPS-Dir review of draft-ie… Tim Bray
- Re: [Json] Gen-ART and OPS-Dir review of draft-ie… Patrik Fältström
- Re: [Json] Gen-ART and OPS-Dir review of draft-ie… John Cowan
- Re: [Json] Gen-ART and OPS-Dir review of draft-ie… John Cowan
- Re: [Json] Gen-ART and OPS-Dir review of draft-ie… Nico Williams
- Re: [Json] Gen-ART and OPS-Dir review of draft-ie… Nico Williams
- Re: [Json] Gen-ART and OPS-Dir review of draft-ie… Nico Williams
- Re: Gen-ART and OPS-Dir review of draft-ietf-json… Nico Williams
- Re: [Json] Gen-ART and OPS-Dir review of draft-ie… Nico Williams
- Integrity protection for RFCs (was Re: Status of … Nico Williams
- Re: [Json] Gen-ART and OPS-Dir review of draft-ie… Patrik Fältström
- Re: Status of RFC 20 Nico Williams
- Re: [Json] Gen-ART and OPS-Dir review of draft-ie… Nico Williams
- Re: Integrity protection for RFCs (was Re: Status… manning bill
- Re: [Json] Gen-ART and OPS-Dir review of draft-ie… Martin J. Dürst
- Re: [Json] Gen-ART and OPS-Dir review of draft-ie… Patrik Fältström
- Re: [Json] Gen-ART and OPS-Dir review of draft-ie… Patrik Fältström
- Re: Cited documents, was Status of RFC 20 John Levine
- RE: Gen-ART and OPS-Dir review of draft-ietf-json… Black, David
- Re: Cited documents, was Status of RFC 20 Dave Crocker
- Re: Cited documents, was Status of RFC 20 Nico Williams
- Re: [Json] Gen-ART and OPS-Dir review of draft-ie… John Cowan
- Re: Status of RFC 20 Heather Flanagan (RFC Series Editor)
- Re: Gen-ART and OPS-Dir review of draft-ietf-json… Nico Williams
- RE: Gen-ART and OPS-Dir review of draft-ietf-json… Black, David
- Re: Cited documents, was Status of RFC 20 Andrew Sullivan
- Re: Cited documents, was Status of RFC 20 John C Klensin
- Re: Gen-ART and OPS-Dir review of draft-ietf-json… Nico Williams
- Re: Gen-ART and OPS-Dir review of draft-ietf-json… Matthew Kerwin
- Re: Gen-ART and OPS-Dir review of draft-ietf-json… Nico Williams
- RE: Gen-ART and OPS-Dir review of draft-ietf-json… Black, David
- Re: [Json] Gen-ART and OPS-Dir review of draft-ie… John Cowan
- Re: Status of RFC 20 (was: Re: Gen-ART and OPS-Di… Julian Reschke
- Re: Status of RFC 20 (was: Re: Gen-ART and OPS-Di… ned+ietf
- Re: Status of RFC 20 (was: Re: Gen-ART and OPS-Di… John C Klensin
- Re: Status of RFC 20 (was: Re: Gen-ART and OPS-Di… John C Klensin
- Re: Status of RFC 20 (was: Re: Gen-ART and OPS-Di… ned+ietf
- Re: Status of RFC 20 (was: Re: Gen-ART and OPS-Di… John C Klensin