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