[Simple] Comments on draft-thomson-simple-cont-presence-val-req-00

[Cullen Jennings <[e-mail]>]

I really liked this draft and hope that we proceed with solutions to  
some to these requirements.

One small thing, I think an example might help illustrate all the  
issues. I was trying to think of an example that illustrates many of  
the problems yet is not too complicated or too tied up in other  
controversial issues. Location seemed to complicated though it is  
probably the most important use case. The example that came to mind  
was imagine my communication device could measure my body temperature.  
This information is privacy sensitive, associated with user more  
though measured by device, continuous. It easy to imagine a sensor  
that could be within a 2 degree error in an almost instantaneously  
measurement seconds but needed to integrate for 45 seconds to get down  
to 0.0 degree error.  (Yah, yah, I know error is a big vague but  
forgive me that for now). It's easy to imagine some applications where  
1 degree is fine and there are others where one needs to be at the 0.1  
degree level. One could have applications that wanted to be notified  
if it went below 96 degrees fahrenheit or over 101 degrees. It easy to  
imagine applications that want it report once an hour.

The value based trigger section does not discuss the difficulties of  
how noisy measurement randomly bouncing above and below the threshold  
but this seems like it is often one of the issues.

On requirement V1. As you know, specifying ranges of multivariate  
values can get complicated. For multivariate values, I think it wold  
be sufficient to have an scheme where a min max value for for each  
variable was specified and any time any variable crossed one of these  
thresholds, an update was triggered.


Cullen in my individual contributor role

PS - This was a really nicely written draft. I read just about ever  
draft that was on a RAI agenda and this was probably the most coherent  
easy to understand draft I read. Thanks 
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