{
  "entity": { "is": null },
  "data_type": {},

  "bool": {"is": "data_type"},
  "int": {"is": "data_type"},
  "float": {"is": "data_type"},
  "string": {"is": "data_type"},

  "min_value": {"is": "int"},
  "max_value": {"is": "int"},
  "min_length": {"is": "int"},
  "max_length": {"is": "int"},

  "single_line": {"is": "bool"},
  "single_value": {"is": "bool"},

  "regexp": {"is": "string", "single_line": true}
}