Extensions as First-Class Fields

[niquola]

We need clarification what is First-Class Fields

In spec:

resourceType: Patient
gender: ...
extension:
 - url: ...race
    valueCoding: 
        code: <code>
        system: <sys>

# this is in example
resourceType: Patient
gender: ...
race:
   value:
      Coding: 
         code: <code>
         system: <sys>

# this is how i see FCE
resourceType: Patient
gender: ...
race: 
   code: <code>
   system: <sys>

[niquola]

And we need example of nested extensions in spec.

We can use real one - https://www.hl7.org/fhir/us/core/StructureDefinition-us-core-race.html - to illustrate

[rbrush]

Yes, it should be race.code and race.system as you mentioned. I'm about to travel for a couple days but will put together a PR the spec to fix when I get back.