code: def Validate(self):
      
      self.pathspec.Validate()
  
      if (self.HasField("start_time") and self.HasField("end_time") and
          self.start_time > self.end_time):
        raise ValueError("Start time must be before end time.")
  
      if not self.path_regex and not self.data_regex and not self.path_glob:
        raise ValueError("A Find specification can not contain both an empty "
                         "path regex and an empty data regex")
docs: Ensure the pathspec is valid.