This object is the name of the first ATM address filter set or ATM
address filter expression used in the logical expression. The
value of this object can only be either an already existing
atmAddressFilterSetName whose row is already active in the
ciscoAtmAddressFilterSetTable or an atmAddressFilterExpressionName
whose row is already active in the ciscoAtmAddressFilterExpressionTable.
When the reference that this object is pointing to gets deleted out from
under it, this object may have a value that does not exist in both
ciscoAtmAddressFilterSetTable and ciscoAtmAddressFilterExpressionTable
and the expression will be evaluated as if the deleted filter resulted
in a match with a permission of 'permit'. The value of this object can
be modified for an existing row only after placing that row notInService
by setting the corresponding atmAddressFilterExpressionRowStatus object
to notInService.