json_schema: {
      "$schema": "http://json-schema.org/draft-04/schema#",
      "type": "object",
      "required": [
          "widgetListing"
      ],
      "properties": {
          "fileListing": {
              "type": "object",
              "description": "Extract widget information from a file listing.",
              "properties": {
                  "list": {
                      "type": "array",
                      "description": "A list with json files which contain information about used widgets.",
                      "default": [
                          "widget-list.json"
                      ],
                      "items": {
                          "type": "string"
                      }
                  },
                  "applicationUrl": {
                      "type": "string",
                      "description": "The url of the application with the widgets. Default is the application in which the activity is included.",
                      "default": ""
                  }
              }
          },
          "widgetListing": {
              "type": "object",
              "required": [
                  "resource"
              ],
              "description": "Provide a list of available widgets and activities as a resource.",
              "properties": {
                  "resource": {
                      "type": "string",
                      "format": "topic",
                      "axRole": "outlet",
                      "description": "The list resource topic."
                  }
              }
          }
      }
  }