Re: Supersedes/Replaces in our present draft
Thomas Gschwind <tom <at> infosys.tuwien.ac.at>
1998-11-11 13:14:18 GMT
On Wed, 11 Nov 1998, Charles Lindsey wrote:
> Which brings us to another suggestion made by Clive on the nntp list, and
> which should now be considered by this list. He proposes to modify the
> Xref: header as follows:
> Xref: servername comp.foo.bar:4321/1234
> The bad news is that the article has to be downloaded to the newsreader
> (or at least its headers) before the decision not to take it is made. The
> good news is that newsreaders can be configured to show Replaced articles
> regardless if the user so desires.
The corresponding overview record is sufficient.
> Now the question is, if we introduce that feature into the Xref header,
> what existing stuff will break? Or, what is the Xref header actually used
> for? Avoiding showing a cross-posted article in more than one group for
> one, but are there other uses? Note that Xref is commonly included in the
> overview for just that purpose. So will showing both numbers break
> existing implementations - or, what are those numbers used ror anyway?
As far as I know, only to mark cross-posted articles as read in the
other groups. In the worst case, some news readers will not be able to
do this. (tin would not be affected by this change (ignores everything
after group:number up to the next whitespace), I do not know of other
news readers but I can check this if there is interest).
However, I think this feature could be implemented even without changing
the current format of the Xref header. The Replaces header and the list
of all message ids in the current newsgroup is sufficient.