In <3A2D1304.225EB9AF@myrealbox.com>,
SiKing <siking@myrealbox.com> wrote:
...
>> Message-ID: <MyFAQPart3Issue36@myrealbox.com>
>> Supersedes: <MyFAQPart3Issue35@myrealbox.com>
>> References: <MyFAQPart1Issue36@myrealbox.com>
...
>Assuming that my client can understand all of these, what does the
>"Supersedes" mean to it? I already know the other two. What does it do
>with this information? Does it expire the message specified?
News-reading clients do nothing (AFAIK) with Supersedes, but news
servers may use it to expire the previous posting of an FAQ. This is
useful in that FAQs may be posted every N days, with an Expires header
for N*M days in the future, and thus it will be M times more likely that
some copy of that FAQ may be available at any given news site, even if
propagation to that site is poor. Using Supersedes as well as Expires
then helps reduce the number of redundant copies of the FAQ at a site.
The Usefor working group has explored allowing multiple Message-IDs in
the Supersedes header to handle expiring the last M postings. They have
also explored a Replaces header, intended to allow servers to not
display exact copies of posts to clients, such as in the common case of
an FAQ being posted unchanged for months at a time. Details at:
http://www.landfield.com/usefor/ Usenet Format (UseFor) List Archive
>Edward Reid wrote:
>> I strongly recommend that you use the posting server at rtfm.mit.edu,
>> which is mentioned in the docs you've read. You will need to get a
>> separate document (from the same source) of instructions on how to use
>> it. It's easy and will take care of all these matters for you. Most
>> likely many of the "neat" message IDs you have seen are from this
>> posting server.
An local alternative for people who can use Perl to post FAQs is:
ftp://ftp.novia.net/customers/pschleck/auto-faq/
which provides a config file to handle headers, including the "neat"
Message-IDs, auto-handling of Supersedes, and good handling of
multi-part FAQs. Another similar (but dated) package is:
ftp://rtfm.mit.edu/pub/post_faq/
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