Well, misunderstanding.
audience would be of course “posted within a group” which is a "type": ["Group", "Collection"].
But context is super important for defining that a workflow happens within a Group, which is an aspect of, yes, “threading”.
But the initial question was both
the way to specify which group a specific post belongs to, and who created it
I am a bit desperate, the way concensus worked over all the time was to have meetings, we will write an FEP together later and the next meeting would be on Tuesday (every 2nd of a month).
I’ll add it to the W3C calendar soon and here as well.
cc @bengo maybe want to talk about the capabilities thing ?
The current meeting make only sense if we do not fragment things.
See also this Developers Meeting 2 : Groups - #3 by Sebastian -
would like to write on but late for work (where we will do examples how to do it C2S too), will edit later.