{
  "name":"f",
  "description":" out = f(x)",
  "spec": {
    "id": "__HOPE__/builtin/user_defined/f",
    "in": {
      "ports": [{
        "name": "x"
        }]
    },
    "out": {
      "ports": [{
          "name": "out"
        }]
    },
    "config": [{
        "name": "f(x)",
        "type": "string",
        "use_editor": true
      }]
  },
  "doc":"builtin/user_defined.html#f"
}