Tim Benson wrote:

>Surely the criterion for any structured data is whether another application
>is expected to use that structured data in a way that (a) adds value and (b)
>is safe.  If either (a) or (b) are not true then structure simply adds cost
>and complexity without benefit.
>
Tim, I agree with the premise; but what is your solution in this case? 
The structure would only change in a very trivial way i.e. by adding a 
flag which means "day_unknown". Are you asking for a use case which 
proves that this should exist? I agree - that's what we need. Tim has 
provided the simplest of all - if the patient said it, we should record 
it. Is it enough - I don't know...

- thomas beale


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