docs: def _to_dict(self):
          """Return a json dictionary representing this model."""
          _dict = {}
          if hasattr(self, 'notice_id') and self.notice_id is not None:
              _dict['notice_id'] = self.notice_id
          if hasattr(self, 'created') and self.created is not None:
              _dict['created'] = datetime_to_string(self.created)
          if hasattr(self, 'document_id') and self.document_id is not None:
              _dict['document_id'] = self.document_id
          if hasattr(self, 'query_id') and self.query_id is not None:
              _dict['query_id'] = self.query_id
          if hasattr(self, 'severity') and self.severity is not None:
              _dict['severity'] = self.severity
          if hasattr(self, 'step') and self.step is not None:
              _dict['step'] = self.step
          if hasattr(self, 'description') and self.description is not None:
              _dict['description'] = self.description
          return _dict