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Re: Archives

2004-11-06 12:24:17

On Thu November 4 2004 11:49, Keith Moore wrote:

because the "name" is a URL, it _will_ be different for different 
access schemes.  I'm expecting that the archiver will have to know
about the access methods that are available.

I think that's a significant practical problem.   I have outlined
a means of implementing access to an archive of mailing list
messages via a half dozen URI schemes using off-the-shelf
software packages.  Adding an Archived-At field with IMAP, POP,
and perhaps NNTP URIs would certainly require modification --
perhaps extensive -- but is probably feasible [1,2]. Expecting an
IMAP local delivery archiver to possess detailed information
about ftp, http, etc. access methods and configuration is a bit
much; again, probably feasible, but not without a considerable
amount of modification.

1. A news URI referring to the message identifier would be
    trivial; however it would also be nearly useless for remote
    access as the news URI scheme has no provision for
    specifying host or port.  Likewise for the mid URI scheme,
    which is indistinguishable (when referring to an entire message)
    from the specific variety of news scheme URI mentioned here.

2. One issue is that adding a field at that late stage will change
    the message size, which might have already been recorded
    in a database (for returning message metadata and folder
    statistics via IMAP, POP, and NNTP protocols).

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