{
  "resourceType": "StructureDefinition",
  "url": "http://example.org/fhir/StructureDefinition/maternalLastName",
  "name": "MaternalLastName",
  "status": "active",
  "publisher": "InterSystems Iberia",
  "kind": "complex-type",
  "abstract": false,
  "type": "Extension",
  "baseDefinition": "http://hl7.org/fhir/StructureDefinition/Extension",
  "derivation": "constraint",
  "differential": {
    "element": [
      {
        "id": "Extension",
        "path": "Extension",
        "short": "Maternal Last Name",
        "definition": "This field stores the patient's maternal last name.",
        "min": 0,
        "max": "1",
        "type": [
          {
            "code": "string"
          }
        ]
      }
    ]
  }
}