In a so-called closed-world system, everything that is stated
constitutes the totality of the truths about the world it relates to. In
particular, /absence/ of an assertion (such as 'patient X has cancer')
means negation, i.e. that patient X doesn't have cancer. But openEHR and
13606 don't work like that; absence of some particular statement about X
just means nothing has been said about the relevant issue so far.
- thomas
On 01/04/2018 23:35, GF wrote:
Thomas,
OpenEHR and 13606 deal with Closed World Assumption systems.
And therefor both mean in the case of 'No Cancer' that Cancer was not
found in the database or that No Cancer was the documented result of
an evaluation.
Both statements are documented things in a Template that according to
the author cancer is not found.
But any time in the future it might.
'No Cancer' as pre-coordinated term in the case of SNOMED means that
no cancer was, is, or will be present.
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