{
  "resourceType": "StructureDefinition",
  "meta": {
    "lastUpdated": "2020-01-11T14:13:59.045+00:00"
  },
  "url": "http://example.org/fhir/StructureDefinition/MyExtension-age",
  "name": "MyExtensionAge",
  "status": "draft",
  "date": "2020-01-11T14:13:54.8809562+00:00",
  "fhirVersion": "4.0.0",
  "mapping": [
    {
      "identity": "rim",
      "uri": "http://hl7.org/v3",
      "name": "RIM Mapping"
    }
  ],
  "kind": "complex-type",
  "abstract": false,
  "context": [
    {
      "type": "element",
      "expression": "Patient"
    }
  ],
  "type": "Extension",
  "baseDefinition": "http://hl7.org/fhir/StructureDefinition/Extension",
  "derivation": "constraint",
  "differential": {
    "element": [
      {
        "id": "Extension.url",
        "path": "Extension.url",
        "fixedUri": "http://example.org/fhir/StructureDefinition/MyExtension-age"
      }
    ]
  }
}