{
  # group and class declaration config
  # option spaces
  "Dhcp4": {
//  "option-space": {
//    "name": "bar",
//    /// Only code width 1 is supported
//    "code-width": 4,
//    /// Only length width 1 is supported
//    "length-width": 4
//  },
//  "option-space": {
//    "name": "full",
//    /// Only code width 1 is supported
//    "code-width": 2,
//    /// Only length width 1 is supported
//    "length-width": 2
//  },
    "option-def": [
      {
        "space": "foobar",
        "name": "test",
        "code": 1,
        "type": "string"
      },
      {
        "space": "foo",
        "name": "test",
        "code": 1,
        "type": "string"
      }
    ]
  }
}