Presence and IntComm WG

[Candace Holman <>]

For now let's assume that the PA and pidf-diff (partial pa update) runs on 
a central server, although clearly there are advantages to running these 
operations on the client.

Candace

At 03:59 PM 5/17/2005, you wrote:
> In fact, there can be a mixed model. Instead of having a completely
> centralized PA for all users, every user can have his/her own PA to handle
> presence composition for his/her multiple PUAs, but the PAs can be in a
> P2P network.
>
> BTW, to correct my answer on partial event notification. If we put the
> burden of status composition on watchers, using pidf-diff does not require
> a centralized model.
>
> -Xiaotao
>
> ===========================================================
> Name      : Xiaotao Wu
> Email     : 
>
> Homepage  : http://www.cs.columbia.edu/~xiaotaow
> Phone     : (212)939-7054,  Fax: (212)666-0140
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> SIP       : 
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> ===========================================================
>
> On Tue, 17 May 2005, Ben Teitelbaum wrote:
>
> > Steve Blair 
> <>
>  writes:
> >
> > >>Candace,
> > >>
> > >>This is a great list.  I might add:
> > >>
> > >>7. Off-line presence (i.e in the absence of any PUAs); for example, a
> > >>   PA might report when a user was last seen;
> > >>
> > > Really? This would seem to pull PIC back into the social context
> > > conversation. I would think the key is user settable presence. For
> > > example if a users wants such off-line presence they could enable it
> > > but it would be off by default. Am I missing the big picture on this
> > > one?
> >
> > When I've heard Henning talk about this, the model is still very much
> > that the user sets the policy and composition rules and uploads them
> > to a PA via XCAP.  I'm not sure where the specification of policy
> > language stands in SIMPLE.
> >
> > Note that RPID has "since" and "until" attributes, so some of the
> > off-line presence that a PA might furnish could have been explicitly
> > published by a user's presentity.  For example, a local calendar app
> > on a user's laptop might publish "on plane until 18:20 UTC" just
> > before disconnecting.  Authorized watchers should be able to retrieve
> > this presence from the user's PA while he/she is off-line on the
> > plane.
> >
> > -- ben
> >
> > --
> > Ben Teitelbaum   http://people.internet2.edu/~ben/
> >