We examined many implementations before proposal. Many implementations (such as Windows, Linux, FreeBSD, and many other network devices) display lower case.
I would like to ask simple question. Can we change many implementations? I think that is too late. lowercase is already "de fact standard". Best regards, Masanobu > >The following errata report has been submitted for RFC5952, >"A Recommendation for IPv6 Address Text Representation". > >-------------------------------------- >You may review the report below and at: >http://www.rfc-editor.org/errata_search.php?rfc=5952&eid=2656 > >-------------------------------------- >Type: Technical >Reported by: D. Stussy <d.stu...@yahoo.com> > >Section: 4.3 > >Original Text >------------- >4.3. Lowercase > > The characters "a", "b", "c", "d", "e", and "f" in an IPv6 address > MUST be represented in lowercase. > > >Corrected Text >-------------- >4.3. Case of Alphabetic Digits. > > The digits "A" through "F" in an IPv6 address > MUST be represented in upper case. User and user > derived input may be represented using lower case. > > >Notes >----- >Historically from the 1960's, hexidecimal digits other than decimal digits are >represented by upper case letters. Lower case letters may have become >acceptable as user input, but such resulted from lazy programmers who couldn't >manage to hit the shift key on their keyboards. However, lower case is not >acceptable for digit output. Many early assemblers would not even accept >lower case as valid input digits except where the radix base exceeded 36 (thus >exhausting all upper case values). This poor programming practice should not >be allowed to be codified into any Internet standard. > >References: >- Struble, George W., "Assembler Language Programming: The IBM System/360 and >/370." Addison-Wesley Publishing Co., 1969 and 1975 (Second Edition), Page 6. > ISBN 0-201-7322-6 >- Barden, William Jr., "TRS-80 Assembly-Language Programming." Tandy >Corporation, 1979, page 14. Library of Congress #79-63607 >- Leventhal, Lance A., "6502 Assembly Language Programming." Osborne >McGraw-Hill, 1979 and 1986 (Second Edition), Page 1-4. ISBN 0-07-881216-X >- Intel Corporation, "Intel486 Microprocessor Family Programmer's Reference >Manual." 1995, Page 1-8 (Section 1.3.4). No ISBN or LoC #. >- Cress, Paul, Dirksen, Paul, and Grahm, J. Wesley, "Fortran IV with WatFor >and WatFiv." Prentice-Hall, 1968 and 1970, Page 245. LoC 74-129241 >- Mano, M. Morris, "Computer System Architecture." Prentice-Hall, 1982, Page >79. ISBN 0-13-166611-8 >- Higgins, Richard J., "Electronics with Digital and Analog Integrated >Circuits." Prentice-Hall, 1983, Page 60. ISBN 0-13-250704-8 > >However, I also note this ONE source permits mixed case: >- Kernighan, Brian W. & Ritchie, Dennis M., "The C Programming Language", >Prentice Hall, 1978 (First Edition), Page 180. ISBN 0-13-110163-3 > >Many other pre-1990 computer science and engineering books show hexidecimal >non-decimal digits as upper case only and NEVER as lower case. However, I >could not find pages in them defining the lettered-digits as upper case only >despite their consistent usage of upper case printing. > >Instructions: >------------- >This errata is currently posted as "Reported". If necessary, please >use "Reply All" to discuss whether it should be verified or >rejected. When a decision is reached, the verifying party (IESG) >can log in to change the status and edit the report, if necessary. > >-------------------------------------- >RFC5952 (draft-ietf-6man-text-addr-representation-07) >-------------------------------------- >Title : A Recommendation for IPv6 Address Text Representation >Publication Date : August 2010 >Author(s) : S. Kawamura, M. Kawashima >Category : PROPOSED STANDARD >Source : IPv6 Maintenance >Area : Internet >Stream : IETF >Verifying Party : IESG -------------------------------------------------------------------- IETF IPv6 working group mailing list ipv6@ietf.org Administrative Requests: https://www.ietf.org/mailman/listinfo/ipv6 --------------------------------------------------------------------
