code: def validate(cls, value: Union[str]) -> str:
      return value
  
file_path: FATE/python/fate/components/core/essential/_role.py
imports: from typing import Any, Dict, Union
  import pydantic
label_desc: Use image node_id 4 for calling the Role obj's underlying member method code with example usage: obj.validate(cls, value) and returns: value