to a HELD request, and quality "results" to a HELD response.
Taking the response first, I don't think it is appropriate to return the
quality of the PIDF in something other than a PIDF. In particular, if I
convey the PIDF to some other entity, that entity needs to know what the
quality of the result is.
I think inferring quality by, for example, returning a circle with a radius
rather than a point with uncertainty and confidence is wrong. The PIDF
should return the point, and express the quality. I want to add elements to
PIDF to express the quality of the data provided.
Turning to the request, I would like the ability for the SIP presence
mechanism to be able to request a specific quality. One way to do that is
to specify the quality with a filter. We've been having a discussion on
this point. In this email, I'm expressing support for that notion, using
common syntax between a HELD request and a SIP Presence subscription: I want
to define an XML namespace used to request location quality, which can be
used in a HELD request (including a deref request) and a SIP Presence
filter, with the same syntax and semantics.
Brian
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