RE: [Simple] Re: Presence Data Model: Overriding services (tuples)

[Markus.Isomaki at nokia.com]

Hi,

> -----Original Message-----
> From: ext Paul Kyzivat [mailto:pkyzivat at cisco.com]
> Sent: 12 October, 2004 16:21
> To: Henning Schulzrinne
> Cc: Dag Ekengren; Isomaki Markus (Nokia-TP/Espoo); Jonathan Rosenberg;
> simple at ietf.org
> Subject: Re: [Simple] Re: Presence Data Model: Overriding services
> (tuples)
> 
> 
> 
> 
> Henning Schulzrinne wrote:
> >> Out of curiosity, is there anything that says that the 
> contact uri must
> >> be unique within the composed document? With the service 
> tuples being
> >> identified by tuple-id:s, is there anything preventing to 
> such tuples
> >> having the same contact uri:s?
> 
> At the moment the answer is that Jonathan's data model document says 
> they must be unique.
> 

I think this has to be relaxed, and there must be something else used to provide the uniqueness. I think Jonathan uses the uniqueness for two purposes: 1. Providing the override capability. I have argued that this should be done using something else than the contact URI as the key. 2. Providing the watcher a contact using which the watcher gets to the service described by the tuple. This is very useful, but I don't think it is essential. 

Markus

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