docs: def _to_dict(self):
          """Return a json dictionary representing this model."""
          _dict = {}
          if hasattr(self, 'exclude_tags_completely'
                    ) and self.exclude_tags_completely is not None:
              _dict['exclude_tags_completely'] = self.exclude_tags_completely
          if hasattr(self, 'exclude_tags_keep_content'
                    ) and self.exclude_tags_keep_content is not None:
              _dict['exclude_tags_keep_content'] = self.exclude_tags_keep_content
          if hasattr(self, 'keep_content') and self.keep_content is not None:
              _dict['keep_content'] = self.keep_content._to_dict()
          if hasattr(self,
                     'exclude_content') and self.exclude_content is not None:
              _dict['exclude_content'] = self.exclude_content._to_dict()
          if hasattr(
                  self,
                  'keep_tag_attributes') and self.keep_tag_attributes is not None:
              _dict['keep_tag_attributes'] = self.keep_tag_attributes
          if hasattr(self, 'exclude_tag_attributes'
                    ) and self.exclude_tag_attributes is not None:
              _dict['exclude_tag_attributes'] = self.exclude_tag_attributes
          return _dict