code: def CreateDataTypeMap(self, definition_name):
      
      data_type_definition = self._definitions_registry.GetDefinitionByName(
          definition_name)
      if not data_type_definition:
        return None
  
      return DataTypeMapFactory.CreateDataTypeMapByType(data_type_definition)
docs: Creates a specific data type map by name.
  
      Args:
        definition_name (str): name of the data type definition.
  
      Returns:
        DataTypeMap: data type map or None if the date type definition
            is not available.