From: Charles Lindsey (chl@clw.cs.man.ac.uk)
Date: Thu Oct 11 2001 - 10:31:49 CDT
In <200110101726.NAA18270@darkstar.prodigy.com> davidsen@prodigy.com (Bill Davidsen) writes:
>chl@clw.cs.man.ac.uk (Charles Lindsey) noted:
>> Which is a prime example of why we need to have (at least some of) this
>> discussion now, because our current draft says the article SHOULD be
>> rejected if it arrives after the cancel. If we are seriously thinking of
>> changing that in the future (and you make a plausible case) then we need
>> to rethink that wording NOW.
>I have no problem with SHOULD if people want that, as long as it isn't
>MUST. I would expect most implementations to do that anyway, so we could
>bring the wording in agreement with SHOULD.
The wording in the present draft is as follows:
A serving agent that elects to honour a cancel message SHOULD delete
the target article completely and immediately (or at the minimum make
the article unavailable for relaying or serving) and also SHOULD
reject any copies of this article that appear subsequently. See also
sections 8.3 and 8.4.
which clearly implies the usual "put it in your history file, so the real
article will look like a duplicate when it arrives".
But the problem with that is it breaks Cancel-Locks (though, in practice,
it would be most unusual for the cancel to arrive first in the typical
single-user case). So if we are seriously likely to introduce Cancel-Locks
in the security extension, then it might be better to tone that down
somewhat. How about the following?
[Alternative wording
A serving agent that elects to honour a cancel message SHOULD delete the
target article completely and immediately (or at the minimum make the
article unavailable for relaying or serving). If the target article is
unavailable, the cancel message SHOULD be retained so that the target
article may be rejected if it appears subsequently.
]
Or, if that swings too far in the other direction, something in between?
-- Charles H. Lindsey ---------At Home, doing my own thing------------------------ Tel: +44 161 436 6131 Fax: +44 161 436 6133 Web: http://www.cs.man.ac.uk/~chl Email: chl@clw.cs.man.ac.uk Snail: 5 Clerewood Ave, CHEADLE, SK8 3JU, U.K. PGP: 2C15F1A9 Fingerprint: 73 6D C2 51 93 A0 01 E7 65 E8 64 7E 14 A4 AB A5