{
  "$schema": "http://json-schema.org/draft-04/schema#",
  "type": "object",
  "id": "Command",
  "title": "Command",
  "properties": {
    "domain": { "type": "string" },
    "action": { "type": "string" },
    "uid": { "type": "string" },
    "payload": { "type": "object" },
    "key": { "type": "string" }
  },
  "required": [
    "domain", "action", "uid"
  ],
  "additionalProperties": false
}