docs: def _to_dict(self):
          """Return a json dictionary representing this model."""
          _dict = {}
          if hasattr(self, 'document_id') and self.document_id is not None:
              _dict['document_id'] = self.document_id
          if hasattr(self,
                     'configuration_id') and self.configuration_id is not None:
              _dict['configuration_id'] = self.configuration_id
          if hasattr(self, 'status') and self.status is not None:
              _dict['status'] = self.status
          if hasattr(
                  self,
                  'status_description') and self.status_description is not None:
              _dict['status_description'] = self.status_description
          if hasattr(self, 'filename') and self.filename is not None:
              _dict['filename'] = self.filename
          if hasattr(self, 'file_type') and self.file_type is not None:
              _dict['file_type'] = self.file_type
          if hasattr(self, 'sha1') and self.sha1 is not None:
              _dict['sha1'] = self.sha1
          if hasattr(self, 'notices') and self.notices is not None:
              _dict['notices'] = [x._to_dict() for x in self.notices]
          return _dict