{
  "$schema": "http://json-schema.org/draft-04/schema#",
  "id": "/",
  "type": "object",
  "properties": {
    "value": {
      "id": "value",
      "type": "string"
    },
    "timestamp": {
      "id": "timestamp",
      "type": "string"
    }
  },
  "required": [
    "value",
    "timestamp"
  ]
}