json_schema: {
      "$id": "https://example.com/restapi/HasReadOnlyEtc.json",
      "$schema": "http://json-schema.org/draft-07/schema#",
      "title": "HasReadOnlyEtc",
      "type": "object",
      "definitions": {
          "MyDateTime": {
              "type": "string",
              "format": "date-time",
              "readOnly": true
          },
          "MyUtcMillisec": {
              "type": "number",
              "format": "utc-millisec",
              "readOnly": true
          }
      },
      "properties": {
          "TheDateAndTime_ReadOnly": {
              "$ref": "#/definitions/MyDateTime"
          },
          "TheTimestamp_ReadOnly": {
              "$ref": "#/definitions/MyUtcMillisec"
          },
          "TheDateAndTime_NotReadOnly": {
              "$ref": "#/definitions/MyDateTime",
              "readOnly": false
          },
          "TheTimestamp_NotReadOnly": {
              "$ref": "#/definitions/MyUtcMillisec",
              "readOnly": false
          },
          "StringValue_ReadOnly": {
              "type": "string",
              "readOnly": true
          },
          "IntegerValue_ReadOnly": {
              "type": "integer",
              "readOnly": true
          },
          "String_WriteOnly": {
              "type": "string",
              "writeOnly": true
          },
          "Integer_WriteOnly": {
              "type": "integer",
              "writeOnly": true
          },
          "NoAdditional": {
              "type": "object",
              "properties": {
                  "foo": {
                      "type": "string"
                  }
              },
              "readOnly": true,
              "additionalProperties": false
          },
          "NoAdditionalPlusPatternProperties": {
              "type": "object",
              "properties": {
                  "foo": {
                      "type": "string"
                  }
              },
              "readOnly": true,
              "patternProperties": {
                  "^S_": {
                      "type": "string"
                  },
                  "^I_": {
                      "type": "integer"
                  }
              },
              "additionalProperties": false
          }
      }
  }