@utilities.arguments_not_none<EOL><INDENT>def get_activity_ids_by_objective_bank(self, objective_bank_id):<DEDENT>
<EOL>id_list = []<EOL>for activity in self.get_activities_by_objective_bank(objective_bank_id):<EOL><INDENT>id_list.append(activity.get_id())<EOL><DEDENT>return IdList(id_list)<EOL>
Gets the list of ``Activity``  ``Ids`` associated with an ``ObjectiveBank``.

        arg:    objective_bank_id (osid.id.Id): ``Id`` of the
                ``ObjectiveBank``
        return: (osid.id.IdList) - list of related activity ``Ids``
        raise:  NotFound - ``objective_bank_id`` is not found
        raise:  NullArgument - ``objective_bank_id`` is ``null``
        raise:  OperationFailed - unable to complete request
        raise:  PermissionDenied - authorization failure
        *compliance: mandatory -- This method must be implemented.*