@abc.abstractmethod<EOL><INDENT>def get_gradebook_columns_by_ids(self, gradebook_column_ids):<DEDENT>
return<EOL>
Gets a ``GradebookColumnList`` corresponding to the given ``IdList``.

        In plenary mode, the returned list contains all of the gradebook
        columns specified in the ``Id`` list, in the order of the list,
        including duplicates, or an error results if a ``Id`` in the
        supplied list is not found or inaccessible. Otherwise,
        inaccessible gradeboook columns may be omitted from the list.

        :param gradebook_column_ids: the list of ``Ids`` to retrieve
        :type gradebook_column_ids: ``osid.id.IdList``
        :return: the returned ``GradebookColumn`` list
        :rtype: ``osid.grading.GradebookColumnList``
        :raise: ``NotFound`` -- an ``Id was`` not found
        :raise: ``NullArgument`` -- ``grade_book_column_ids`` is ``null``
        :raise: ``OperationFailed`` -- unable to complete request
        :raise: ``PermissionDenied`` -- authorization failure

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