{
  "resourceType": "StructureDefinition",
  "url": "https://example.org/fhir/StructureDefinition/MirjamsObservation",
  "name": "MirjamsObservation",
  "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",
        "path": "Observation",
        "constraint": [
          {
            "key": "mirjam-1",
            "severity": "error",
            "human": "Fill in the value field, or use the note field",
            "expression": "value.exists() or note.exists()"
          }
        ]
      },
      {
        "id": "Observation.subject",
        "path": "Observation.subject",
        "type": [
          {
            "code": "Reference",
            "targetProfile": [
              "http://mirjams.examples.org/StructureDefinition/mirjams-course-patient-2"
            ]
          }
        ]
      },
      {
        "id": "Observation.value[x]",
        "path": "Observation.value[x]",
        "condition": [
          "mirjam-1"
        ]
      },
      {
        "id": "Observation.note",
        "path": "Observation.note",
        "condition": [
          "mirjam-1"
        ]
      }
    ]
  }
}