{
  "type": "object",
  "properties": {
    "symbol": {
      "type": "string",
      "minLength": 1
    },
    "units": {
      "type": "integer",
      "description": "The number of units extracted that were placed into the ship's cargo hold."
    }
  },
  "required": [
    "symbol",
    "units"
  ]
}