code: def _get_extension_loader_mapping(self):
          
  
          loader_table = self._get_common_loader_mapping()
          loader_table.update(
              {
                  "asp": HtmlTableTextLoader,
                  "aspx": HtmlTableTextLoader,
                  "htm": HtmlTableTextLoader,
                  "md": MarkdownTableTextLoader,
                  "sqlite3": SqliteFileLoader,
                  "xls": ExcelTableFileLoader,
                  "xlsx": ExcelTableFileLoader,
              }
          )
  
          return loader_table
docs: :return: Mappings of format-extension and loader class.
          :rtype: dict