@utilities.arguments_not_none<EOL><INDENT>def get_activity_ids_by_objective_banks(self, objective_bank_ids):<DEDENT>
<EOL>id_list = []<EOL>for activity in self.get_activities_by_objective_banks(objective_bank_ids):<EOL><INDENT>id_list.append(activity.get_id())<EOL><DEDENT>return IdList(id_list)<EOL>
Gets the list of ``Activity Ids`` corresponding to a list of ``ObjectiveBanks``.

        arg:    objective_bank_ids (osid.id.IdList): list of objective
                bank ``Ids``
        return: (osid.id.IdList) - list of activity ``Ids``
        raise:  NullArgument - ``objective_bank_ids`` is ``null``
        raise:  OperationFailed - unable to complete request
        raise:  PermissionDenied - authorization failure
        *compliance: mandatory -- This method must be implemented.*