@abc.abstractmethod<EOL><INDENT>def chaneged_gradebook_columns(self, gradebook_column_ids):<DEDENT>
pass<EOL>
The callback for notifications of new gradebook columns.

        :param gradebook_column_ids: the ``Ids`` of the new ``GradebookColumns``
        :type gradebook_column_ids: ``osid.id.IdList``


        *compliance: mandatory -- This method must be implemented.*