Description: 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.