Datatypes R2 Issue 64

Introduction

[from Charlie]

Usecase -- I am to take insulin from tomorrow until eternity. How should that be converted into a point in time (for displaying on a date sorted list).

It can't be.--GrahameGrieve 21:19, 20 June 2007 (CDT)

This is the usage for which the property center is defined in the abstract - and the abstract spec says that it should be taken to be "not applicable" in the formal constraints -- which seemed wrong to me -- the midpoint of tomorrow and eternity is eternity.

Don't agree that this is the usage, either explicitly or implicitly, but we could define the latter--GrahameGrieve 21:19, 20 June 2007 (CDT)

However on the list of medications we would probably want it to appear without a date - rather than an age away. Thus I agree with the datatypes as expressed in the formal constraints - and just want the text to mirror the formal constraints.

What text? --GrahameGrieve 21:19, 20 June 2007 (CDT)

agree that "NA" sounds like the right value Charliemccay 05:24, 21 June 2007 (CDT)

Discussion

But I did beef up the invariants about low, high, width, and center considerably

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