Lisa Dusseault wrote:
The IESG reviewed
<http://www.ietf.org/internet-drafts/draft-crocker-rfc4234bis-00.txt>
for publication as Internet Standard and would like to know if there is
consensus to recommend against the use of LWSP in future specifications,
as it has caused problems recently in DKIM and could cause problems in
other places.
Some discussion on this point already:
- http://www1.ietf.org/mail-archive/web/ietf/current/msg46048.html
- http://www1.ietf.org/mail-archive/web/discuss/current/msg00463.html
- http://mipassoc.org/pipermail/ietf-dkim/2007q1/007295.html
-
https://datatracker.ietf.org/public/pidtracker.cgi?command=view_comment&id=66440
(in this tracker comment, Chris Newman recommended to remove LWSP, but
for backward-compatibility it's probably better to keep it and recommend
against use)
I agree that LWSP can be problematic. As the LWSP rule only appears in
appendix B, the best approach IMHO would be to either leave it in, and
have a warning explaining the potential problems close to it, or remove it.
The latter sounds simpler, but could cause spec writers that use ABNF to
just copy the LWSP rule from RFC4234, ignoring the potential issues with it.
The proposed solution to warn about it in the front matter doesn't seem
to be a good idea due to locality reasons. If there are reasons to avoud
LWSP, they should be stated close to the definition. If this means we
need a new revision of the spec, and last-call it again, so be it. No
reason to hurry.
Best regards, Julian
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