code: def _document_structure(self):
          
          logger.debug("Documenting dataset structure")
          key = self.get_structure_key()
          text = json.dumps(self._structure_parameters, indent=2, sort_keys=True)
          self.put_text(key, text)
  
          key = self.get_dtool_readme_key()
          self.put_text(key, self._dtool_readme_txt)
docs: Document the structure of the dataset.