http://hl7.org/fhir/StructureDefinition/valueset-reference|4.0.1

A logical reference (e.g. a reference to ValueSet.url) that identifies the value set/version that identifies the set of possible coded values this coding was chosen from or constrained by.
{
  "description": "A logical reference (e.g. a reference to ValueSet.url) that identifies the value set/version that identifies the set of possible coded values this coding was chosen from or constrained by.",
  "package": "hl7.fhir.r4.core@4.0.1",
  "date": "2019-10-31T22:29:23Z",
  "derivation": "constraint",
  "publisher": "HL7",
  "fhirVersion": "4.0.1",
  "name": "reference",
  "mapping": [ {
    "uri": "http://hl7.org/v2",
    "name": "HL7 v2 Mapping",
    "identity": "v2"
  }, {
    "uri": "http://hl7.org/v3",
    "name": "RIM Mapping",
    "identity": "rim"
  } ],
  "abstract": false,
  "type": "Extension",
  "experimental": null,
  "resourceType": "StructureDefinition",
  "fhirversion": null,
  "title": null,
  "versionAlgorithmCoding": null,
  "extension": [ {
    "url": "http://hl7.org/fhir/StructureDefinition/structuredefinition-wg",
    "valueCode": "vocab"
  }, {
    "url": "http://hl7.org/fhir/StructureDefinition/structuredefinition-fmm",
    "valueInteger": 1
  } ],
  "status": "draft",
  "id": "18c6a253-9f50-5270-aafd-fc31dfcbf5fe",
  "kind": "complex-type",
  "url": "http://hl7.org/fhir/StructureDefinition/valueset-reference",
  "identifier": null,
  "context": [ {
    "type": "element",
    "expression": "Coding"
  } ],
  "versionAlgorithmString": null,
  "fhir_id": null,
  "version": "4.0.1",
  "baseDefinition": "http://hl7.org/fhir/StructureDefinition/Extension"
}