{
  "$defs": {
    "SchemaExtendTest": {
      "additionalProperties": false,
      "properties": {
        "LastName": {
          "description": "some extra words",
          "type": "string"
        },
        "middle_name": {
          "type": "string"
        }
      },
      "required": [
        "LastName"
      ],
      "type": "object"
    }
  },
  "$id": "https://github.com/invopop/jsonschema/schema-extend-test",
  "$ref": "#/$defs/SchemaExtendTest",
  "$schema": "https://json-schema.org/draft/2020-12/schema"
}