On Apr 30, 2012, at 11:02, Peter Saint-Andre wrote:

> On 4/30/12 9:45 AM, Dave Cridland wrote:
>> On Mon Apr 30 17:17:12 2012, Daniel Dormont wrote:
>>> I've been asked to add invisibility to my XMPP-based application.
>> 
>> I think the "right" thing is to use XEP-0186, but that's seen very
>> limited support on the server.
>> 
>> I'm increasingly finding some interesting use-cases for invisibility,
>> such as email clients that need to be presence aware - I don't see a
>> need for confusing the contacts' roster by showing myself online when
>> I'm not, as such.
> 
> Isn't that presence with negative priority?
> 

Negative priority is potentially a hint to the UA not to display to the 
receiving user, but that requires the client to do the right thing and treat 
negative priority as offline/unavailable.  Few clients (most likely none) do 
the right thing today.

I believe it matters if that information is concerning or not.  If not, then 
simple negative priority is probably fine.  If it is, then negative priority + 
invisibility is necessary.


- m&m

Matthew A. Miller
<http://goo.gl/LK55L>

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