{
  "resourceType": "StructureDefinition",
  "meta": {
    "lastUpdated": "2021-02-18T10:41:44.785+00:00"
  },
  "url": "http://example.org/fhir/StructureDefinition/DerivedAllergy",
  "name": "DerivedAllergy",
  "status": "draft",
  "fhirVersion": "4.0.1",
  "kind": "resource",
  "abstract": false,
  "type": "Allergy",
  "baseDefinition": "http://example.org/fhir/StructureDefinition/Allergy",
  "derivation": "constraint",
  "differential": {
    "element": [
      {
        "id": "Allergy.onsetDate",
        "path": "Allergy.onsetDate",
        "min": 1
      }
    ]
  }
}