message: Adding properties to DC patch
diff: "type": "string"
  },
  "description": "Resource tags"
  + },
  + "properties": {
  + "$ref": "#/definitions/DataControllerProperties",
  + "description": "The data controller's properties",
  + "x-ms-client-flatten": false
  }
  },
  "description": "Used for updating a data controller resource."
  