{
  "resourceType": "StructureDefinition",
  "url": "https://example.org/fhir/StructureDefinition/MyObservation",
  "name": "MyObservation",
  "status": "draft",
  "fhirVersion": "4.0.1",
  "kind": "resource",
  "abstract": false,
  "type": "Observation",
  "baseDefinition": "http://hl7.org/fhir/StructureDefinition/Observation",
  "derivation": "constraint",
  "differential": {
    "element": [
      {
        "id": "Observation.subject",
        "path": "Observation.subject",
        "min": 1
      },
      {
        "id": "Observation.subject.reference",
        "path": "Observation.subject.reference",
        "short": "患者 Resource Link",
        "min": 1
      },
      {
        "id": "Observation.encounter",
        "path": "Observation.encounter",
        "min": 1
      },
      {
        "id": "Observation.encounter.reference",
        "path": "Observation.encounter.reference",
        "min": 1
      }
    ]
  }
}