{
  "id": "Element.json",
  "type": "object",
  "datatype": true,
  "category": "fhir",
  "properties": {
    "id": {
      "type": "string",
      "pattern": "[A-Za-z0-9\\-\\.]{1,64}"
    },
    "extension": {
      "type": "array",
      "items": {
        "$ref": "Extension.json"
      }
    }
  },
  "additionalProperties": false
}