FHIR Chat · Code system problem · fhir/infrastructure-wg

Stream: fhir/infrastructure-wg

Topic: Code system problem

Grahame Grieve (Jul 20 2018 at 21:51):

So at this time, it's not possible to put a contained code system inside a value set.

Grahame Grieve (Jul 20 2018 at 21:51):

I think that this is a problem - it should be possible to do that.

Grahame Grieve (Jul 20 2018 at 21:51):

the reason is because there's no trackable internal reference from the value set to the code system.

Grahame Grieve (Jul 20 2018 at 21:52):

the issue is this invariant:

Grahame Grieve (Jul 20 2018 at 21:52):

contained.where((('#'+id in (
  %resource.descendants().reference |
  %resource.descendants().as(canonical))) or
  descendants().where(reference = '#').exists() or
  descendants().where(as(canonical) = '#'
).exists()).not()).trace('unmatched', id).empty())

Grahame Grieve (Jul 20 2018 at 21:54):

so I think that this invariant should say:

Grahame Grieve (Jul 20 2018 at 21:55):

contained.where((('#'+id in (
  %resource.descendants().reference |
  %resource.descendants().as(canonical) |
  %resource.descendants().as(uri) |
  %resource.descendants().as(url))
 ) or  descendants().where(reference = '#').exists()
).exists()).not()).trace('unmatched', id).empty())

Grahame Grieve (Jul 20 2018 at 21:55):

two changes: there's no reason to look for a canonical reference of # to the containing resource. I just can't see how that would be valid

Grahame Grieve (Jul 20 2018 at 21:55):

and the other case is to allow a contained resource referenced by uri or url - e.g. a code system or a binary in a document reference

Lloyd McKenzie (Jul 20 2018 at 23:52):

Canonical reference of # to the containing reference - code system pointing to its definitional value set?

Grahame Grieve (Jul 21 2018 at 00:08):

the code system is not referred to by it's definitional value set that contains it?

Lloyd McKenzie (Jul 21 2018 at 00:18):

It would be, but the Code System would refer to the ValueSet too.

Grahame Grieve (Jul 21 2018 at 00:26):

so the question is not, 'what is valid?', but 'what satisfies the contained resource requirement?'

Lloyd McKenzie (Jul 21 2018 at 00:44):

A contained resource pointing to the container by canonical would meet the requirement. Perhaps a Concept map contained within a ValueSet?

Lloyd McKenzie (Jul 21 2018 at 00:45):

(on the grounds that the two must be maintained together and managed in sync)

Grahame Grieve (Jul 21 2018 at 07:52):

this, it turns out, is GF#17330

Last updated: Apr 12 2022 at 19:14 UTC