FHIR Chat · Double-binding on Extension w/ valueCodeableConcept

Stream: IG creation

Topic: Double-binding on Extension w/ valueCodeableConcept

Chris Moesel (Oct 02 2019 at 16:23):

In the mCODE IG, we have an obf-SpecimenType-extension that has a CodeableConcept value bound to v2 Specimen Type value set w/ example strength.
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In our GenomicReport profile, we include this extension, but we override the value set in the extension with a new one (GeneticSpecimenTypeVS w/ extensible binding). This is done by expanding the obf-SpecimenType-extension inline in the profile and overwriting the binding.

When the IG Publisher renders that profile page, however, it renders both the old value set (from the original extension definition) and the new value set (applied in the profile):
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This doesn't seem right.

One interesting tidbit is that for a short period, the IG Publisher apparently did not work this way, as this is a screen shot from the build.fhir.org, which was built on Aug 2:
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But the previous screen shots (w/ double-bindings) are from the latest build IG Publisher jar.

Lloyd McKenzie (Oct 02 2019 at 19:09):

The bindings are declared at two different levels I think? @Grahame Grieve

Chris Moesel (Oct 02 2019 at 20:38):

In the StructureDefinition JSON files, the binding is on the valueCodeableConcept element in both cases (the original extension and the profile). E.g.:
From obf-SpecimenType-extension extension:

      {
        "id" : "Extension.valueCodeableConcept",
        "path" : "Extension.valueCodeableConcept",
        // snipping out irrelevant stuff
        "type" : [
          {
            "code" : "CodeableConcept"
          }
        ],
        // snipping out irrelevant stuff
        "binding" : {
          "strength" : "example",
          "valueSet" : "http://terminology.hl7.org/ValueSet/v2-0487"
        }
      }

From onco-core-GenomicsReport profile:

      {
        "id" : "DiagnosticReport.extension:specimentype.valueCodeableConcept",
        "path" : "DiagnosticReport.extension.valueCodeableConcept",
        // snipping out irrelevant stuff
        "type" : [
          {
            "code" : "CodeableConcept"
          }
        ],
        // snipping out irrelevant stuff
        "binding" : {
          "strength" : "extensible",
          "valueSet" : "http://hl7.org/fhir/us/mcode/ValueSet/onco-core-GeneticSpecimenTypeVS"
        }
      }