code: def is_expired(
      artifact: types.Artifact, now: Optional[datetime.datetime] = None
  ) -> bool:
      """Checks whether the artifact is expired regarding governance properties."""
      del artifact, now
      return False
  
imports: import datetime
  from typing import Optional
  from tfx import types
label_desc: Use image node_id 1 for calling a global function with example usage: is_expired(artifact, now) and returns: False