{
  "resourceType": "StructureDefinition",
  "url": "https://example.org/fhir/StructureDefinition/MirjamsDecemberObservation",
  "name": "MirjamsDecemberObservation",
  "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": "mir-obs-1",
            "severity": "error",
            "human": "You have to fill in the value or the note field",
            "expression": "value.exists() or note.exists()"
          }
        ]
      },
      {
        "id": "Observation.code",
        "path": "Observation.code",
        "patternCodeableConcept": {
          "coding": [
            {
              "system": "http://snomed.info/sct",
              "code": "38764237687265"
            }
          ]
        },
        "mustSupport": true
      },
      {
        "id": "Observation.subject",
        "path": "Observation.subject",
        "min": 1,
        "type": [
          {
            "code": "Reference",
            "targetProfile": [
              "https://example.org/fhir/StructureDefinition/MirjamsDecemberPatient"
            ]
          }
        ],
        "mustSupport": true
      },
      {
        "id": "Observation.value[x]",
        "path": "Observation.value[x]",
        "condition": [
          "mir-obs-1"
        ]
      },
      {
        "id": "Observation.note",
        "path": "Observation.note",
        "condition": [
          "mir-obs-1"
        ]
      }
    ]
  }
}