UpgradeUnitList (type)

{
  "additionalProperties": false, 
  "id": "UpgradeUnitList", 
  "module_id": "Upgrade", 
  "properties": {
    "list": {
      "items": {
        "$ref": "UpgradeUnit
      }, 
      "required": true, 
      "title": "Collection of Upgrade units", 
      "type": "array"
    }
  }, 
  "type": "object"
}