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From: Kevin Ryde <user42@zip.com.saynotospam.au>
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Subject: Re: references on multiple message followup
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Karl Kleinpaste <karl@charcoal.com> writes:
>
> The problem is that References is, in principle, a strict linear
> parentage list from head to tail of a thread.  Trying to use
> References with multiple, immediately-referring message-ids creates
> something of a lattice, abandoning the linear interpretation.

I'd wondered about that, without knowing what the standards say.
Taking the references just from the last message marked would be
enough for the common uses I can envisage.

> In any event, complicating matters is the problem of how one would
> thread a message in a summary display, based on linear References
> interpretation, that had lattice-like References content.

I guess if you draw together two strands by referring to both then
there's a question of under which one that message should come out.
Yes, that'd be a bit ugly.