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

[Paul Kyzivat <pkyzivat at cisco.com>]

hisham.khartabil at nokia.com wrote:
> > The enforcement is only within a document. The entity that 
> > creates the 
> > document, be it the compositor or the publishers, just doesn't put 
> > multiple services with the same URI. I dont understand why 
> > this is hard.
>
> This is a point that needs emphasising. I think people misunderstood it as no PUA can publish a service with the same service URI as another PUA.

Yes, this was understood.

But it also means that a composer cannot create a document with two 
services having the same service URI. And that in turn means that when a 
composer is presented with two documents that each have a service that 
share the same URI, it MUST either make a choice or merge them in some 
way, or else somehow substitute a different URI in one of them. These 
all require a relatively sophisticated composition policy if you expect 
the result to be reasonable.

I also want to note that while this discussion has so far focused on 
contact addresses in tuples, the issue of allowing conflicting 
information in the document also applies to <person> and <device>.

	Paul


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