docs: def resolve_pid(fetched_pid):
      """Retrieve the real PID given a fetched PID.
  
      :param pid: fetched PID to resolve.
      """
      return PersistentIdentifier.get(
          pid_type=fetched_pid.pid_type,
          pid_value=fetched_pid.pid_value,
          pid_provider=fetched_pid.provider.pid_provider
      )