in-line below
At 06:29 PM 11/3/2009, Hannes Tschofenig wrote:
>Hi James,
>
>Thanks for your detailed review. I am in the process of updating it and have
>comments here and there.
>
>Here is one:
>
>Draft Text:
>
>--------
>
><?xml version="1.0" encoding="UTF-8"?>
><filter-set xmlns="urn:ietf:params:xml:ns:simple-filter">
> <ns-bindings>
> <ns-binding prefix="dyn"
> urn="urn:ietf:params:xml:schema:pidf:dynamic"/>
> </ns-bindings>
> <filter id="123" uri="sip:presentity@example.com">
> <trigger>
> <changed by="3"> [<---James]
> //dyn:speed
> </changed>
> </trigger>
> </filter>
></filter-set>
>
>------
>
>[James]
>
>I get the XML,
>but I don't see what the speed now is of
>the device/target?
>What if this device is moving at 200kmph,
>where would that be placed in the XML?
>Of, is this left for the application at the
>subscriber to calculate?
>If the latter is true, something needs to be
>said about this expectation.
>
>------
>
>The filter would not tell you what the current speed is.
ok, I get that now (though it isn't exactly stated this way explicitly).
Let me pose a scenario for you and see if there is just one NOTIFY or
there are many:
Alice is the target. Initially she isn't moving. her device accepts
a subscription with a <changed by="3"> element in it. She starts to
accelerate (linear or not) until se reaches 100mps. How many NOTIFYs are sent?
1 because she crossed the by="3" attribute, or each time she
accelerates more than 3mps faster since the last NOTIFY.
I'm guessing the latter, but want to be sure.
Again, this isn't exactly explicitly stated in the -07 rev.
James
BTW -- I think Alice sending a NOTIFY every time she accelerates or
decelerates by="3" would be useful information, especially in the
emergency case.
It's toobad we cannot have a "is moving" but less than by="3"
indication. This would tell us it is in a stationary position or
not. Again, for a device/inventory tracking application, this would
seem like very useful information to have.
>The current document only supports 'by' and hence you cannot say something
>like 'tell me when he goes faster than 100kmph'.
>
>Ciao
>Hannes
>
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