@abc.abstractmethod<EOL><INDENT>def assign_objective_to_objective_bank(self, objective_id, objective_bank_id):<DEDENT>
pass<EOL>
Adds an existing ``Objective`` to an ``ObjectiveBank``.

        :param objective_id: the ``Id`` of the ``Objective``
        :type objective_id: ``osid.id.Id``
        :param objective_bank_id: the ``Id`` of the ``ObjectiveBank``
        :type objective_bank_id: ``osid.id.Id``
        :raise: ``AlreadyExists`` -- ``objective_id`` already mapped to ``objective_bank_id``
        :raise: ``NotFound`` -- ``objective_id`` or ``objective_bank_id`` not found
        :raise: ``NullArgument`` -- ``objective_id`` or ``objective_bank_id`` is ``null``
        :raise: ``OperationFailed`` -- unable to complete request
        :raise: ``PermissionDenied`` -- authorization failure

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