json_schema: {
      "type": "object",
      "properties": {
          "value": {
              "allOf": [
                  {
                      "$ref": "#/definitions/Type1"
                  },
                  {
                      "$ref": "#/definitions/Type2"
                  }
              ]
          }
      },
      "required": [
          "value"
      ],
      "definitions": {
          "Type1": {
              "type": "object",
              "properties": {
                  "value1": {
                      "type": "string"
                  }
              },
              "required": [
                  "value1"
              ]
          },
          "Type2": {
              "type": "object",
              "properties": {
                  "value2": {
                      "type": "number"
                  }
              },
              "required": [
                  "value2"
              ]
          }
      },
      "$schema": "http://json-schema.org/draft-04/schema#"
  }