Pete Resnick answers Tony Hansen:
The argument espoused is that adding msg-id-kernel allows that
internal portion of the msg-id to be used by people in other
documents; as 5322 stands, that's not possible.
Do we have an example of someone wanting to use this?
Not 2192bis, but I suspect there's a document like it that ought to say
mail-url = "mail:" msg-id-core
I'm kind of annoyed that msg-id-core pulls in obs-this and obs-that, but
pulling in obs-* is perfectly appropriate for an URL, so I'm not