A. Pagaltzis wrote:
Given this constraint, do you have a better idea how do address
the following concerns?

• Threading-unaware clients should get at least some information
 that allows the user to notice that there’s more to the entry,
 even if the user agent remains blissfully unaware of the thread
 as such.

I think a "related" link that points to the permalink of the original message is a good start.

• The available information precise enough that threading-aware
 can correlate all the related bits without guessing.

What about something like this:

<th:in-reply-to>
 <id>tag:www.example.org:2005:entry1</id>
<link rel="feed" type="application/atom+xml" href="http://www.example.org/feed.atom"/> <link rel="related" type="text/html" href="http:www.example.org/entry1.html"/>
</th:in-reply-to>

No doubt there are issues with the syntax, but the important concept is the idea of having two clearly defined links: one being the permalink for the entry being replied to and the other being the atom feed in which that entry can be found. It could be made more flexible by allowing further "alternate" links, but I'm not sure that's necessary.

Honestly, I haven’t seen any yet that do anything interesting at
all with extra links (be they related, via, or something else)…
(Which rather irks me.)

Me neither. I can't say I'm exactly doing anything interesting with links, but I am at least doing something with them.

Regards
James

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