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Re: [Simple] Data model - attempt at summary (Groups)

I thought you were contradicting the statement in the data model
draft -
"Nothing in the model mandates that the entity being modeled is actually composed
   of a single user. "

I interpreted this statement to imply group support.  I think
I have a different definition for group - see next comment.

I think the model encompasses the "group that appears as one person" model discussed.



What you describe above is a good example of what I would call
a group. When you said -
"We model only one person (and possibly their assistant), not groups of individuals."
Were you thinking of a group as something different in this statement than the example you present above?

Yes. One or two IETF discussion cycles ago, we had discussed groups where individual members were visible to the watcher. For example, each member of the group would have a tuple so that you could see what salesperson Alice, Bob, Carol and Dave were up to as individuals. This gets more complicated.



We have the same problem for a single individual - active contacts
may have different locations (your cell phone is on, but you left
it in your car, your office IM was recently active, but you are now
in a meeting in a conference room, ...)

Again, there is a difference between uncertainty (one of the pieces of information happens to be wrong about the person, it's just hard to tell which one) and true being-in-multiple-places, as would be the case for a group of individuals.



I think there are backwards-compatible solutions for the problem you pose, but I think we should solve the single-person problem first. 



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