{
  "description":"turn the holder left by 10 degree",
  "spec": {
    "id": "__HOPE__/demo/tank_romeo/holder/left",
    "in": {
      "ports": [{
        "name": "trigger"
        }]
    },
    "out": {
      "ports": [{
        "name": "angle",
        "type": "number"
      }]
    }
  },
  "doc": "tank/holder.html#left"
}