Presence and IntComm WG

[Xiaotao Wu <>]

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

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Name      : Xiaotao Wu
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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/
>