{
  "openapi": "3.1.0",
  "info": {
    "title": "OpenAPI 3.1.0 ref type example",
    "version": "1"
  },
  "paths": {
    "/foo": {
      "get": {
        "responses": {
          "200": {
            "description": "OK",
            "content": {
              "application/json": {
                "schema": {
                  "$ref": "#/components/schemas/Foo",
                  "type": ["object", "null"]
                }
              }
            }
          }
        }
      }
    }
  },
  "components": {
    "schemas": {
      "Foo": {
        "properties": {
          "foo": {
            "items": {
              "properties": {
                "baz": {
                  "$ref": "#/components/schemas/Bar",
                  "type": ["object", "null"]
                }
              },
              "required": ["baz"],
              "type": "object"
            },
            "type": "array"
          }
        },
        "required": ["foo"],
        "type": "object"
      },
      "Bar": {
        "properties": {
          "bar": {
            "type": "integer"
          }
        },
        "required": ["bar"],
        "type": "object"
      }
    }
  }
}