json_schema: {
      "additionalProperties": false,
      "description": "Specifies how to describe an external source.",
      "properties": {
          "path": {
              "_id": "path",
              "description": "Full path to the source (may include port number)",
              "title": "Path schema.",
              "type": "string"
          },
          "referenceId": {
              "_id": "referenceId",
              "description": "Which property should we use to name the feature.",
              "title": "ReferenceId schema.",
              "type": "string"
          },
          "refreshIntervalMSec": {
              "_id": "refreshIntervalMSec",
              "description": "Interval in milliseconds to refresh the source.",
              "title": "RefreshIntervalMSec schema.",
              "type": "integer"
          },
          "type": {
              "_id": "type",
              "description": "Specify the subscriber to use.",
              "enum": [
                  "REST"
              ],
              "title": "Type schema."
          }
      },
      "required": [
          "type",
          "path",
          "referenceId",
          "refreshIntervalMSec"
      ],
      "title": "Subscriber schema.",
      "type": "object"
  }