code: def _make_sure_table_exists(self, name_seq):
          
          t = self
          for key in name_seq[:-1]:
              t = t[key]
          name = name_seq[-1]
          if name not in t:
              self.append_elements([element_factory.create_table_header_element(name_seq),
                                    element_factory.create_table({})])
docs: Makes sure the table with the full name comprising of name_seq exists.