Tim Cook wrote:

>For the model, DV_QUANTIFIED.accuracy is more appropriate.  If, in
>an implementation, the developers want to accommodate users (person,
>instrument or external application) with a quantity. Then it can be
>converted to a percentage for storage and back again for display if
>desired.  My point is that I agree with simplifying when something
>can/should be an implementation issue.
>
so in other words: represent and store as a % but allow input and 
display as DV_QUANTITY or %? Hm... this might need an extra flag if the 
DV_QUANTIFIED object is to remember whether it was originally in % or 
quantity form. But that's still quite a bit simpler than what we are 
doing now (especially as we have to have extra constraints in there 
saying that DV_QUANTIFIED.accuracy.is_simple, meaning it cannot have its 
own accuracy, as this would be meaningless. It would be nice to get rid 
of this. I think I am convinced that just by storing a percentage, we 
get the same effect as the current model.

- thomas beale



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