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  <xsd:element id="art_RevenuePerformanceObligationPaymentTerms" name="RevenuePerformanceObligationPaymentTerms" nillable="true" substitutionGroup="xbrli:item" type="xbrli:durationItemType" xbrli:periodType="duration" />
  <xsd:element id="art_RevenuePerformanceObligationSatisfiedoverTimeVariableConsiderationConstrainedPercentage" name="RevenuePerformanceObligationSatisfiedoverTimeVariableConsiderationConstrainedPercentage" nillable="true" substitutionGroup="xbrli:item" type="num:percentItemType" xbrli:periodType="instant" />
  <xsd:element id="art_RevenueRemainingPerformanceObligationPercentage" name="RevenueRemainingPerformanceObligationPercentage" nillable="true" substitutionGroup="xbrli:item" type="num:percentItemType" xbrli:periodType="instant" />
  <xsd:element id="art_SaleLeasebackTransactionNumberOfUnits" name="SaleLeasebackTransactionNumberOfUnits" nillable="true" substitutionGroup="xbrli:item" type="xbrli:integerItemType" xbrli:periodType="instant" />
  <xsd:element id="art_SaleLeasebackTransactionRepaymentFinancingActivities" name="SaleLeasebackTransactionRepaymentFinancingActivities" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="art_SegmentContributionAbstract" name="SegmentContributionAbstract" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="art_SeniorSecuredTermLoanAFacilityMember" name="SeniorSecuredTermLoanAFacilityMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="art_SeniorSecuredTermLoanBFacilityMember" name="SeniorSecuredTermLoanBFacilityMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="art_SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodGrantDateFairValue" name="SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodGrantDateFairValue" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="art_SharebasedCompensationArrangementbySharebasedPaymentAwardOptionsExercisableAbstract" name="SharebasedCompensationArrangementbySharebasedPaymentAwardOptionsExercisableAbstract" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="art_SharebasedCompensationAwardbySharebasedPaymentAwardOptionsAverageRemainingContractualTermAbstract" name="SharebasedCompensationAwardbySharebasedPaymentAwardOptionsAverageRemainingContractualTermAbstract" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element id="art_SharebasedCompensationExcludingPlanModifications" name="SharebasedCompensationExcludingPlanModifications" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element id="art_StockIssuedDuringPeriodSharesWarrantExercises" name="StockIssuedDuringPeriodSharesWarrantExercises" nillable="true" substitutionGroup="xbrli:item" type="xbrli:sharesItemType" xbrli:periodType="duration" />
  <xsd:element id="art_StockIssuedDuringPeriodValueWarrantExercises" name="StockIssuedDuringPeriodValueWarrantExercises" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element id="art_StockIssuedDuringPeriodandAdjustmentstoAdditionalPaidinCapitalSharebasedCompensation" name="StockIssuedDuringPeriodandAdjustmentstoAdditionalPaidinCapitalSharebasedCompensation" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="art_SuperannuationMember" name="SuperannuationMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="art_TheGoldmanSachsGroupInc.Member" name="TheGoldmanSachsGroupInc.Member" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="art_ThirdPartyManagedMember" name="ThirdPartyManagedMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="art_ThirdPartyManagedSegmentMember" name="ThirdPartyManagedSegmentMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="art_TimeBasedRestrictedStockUnitsMember" name="TimeBasedRestrictedStockUnitsMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="art_TransportationMember" name="TransportationMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="art_TransportationSegmentMember" name="TransportationSegmentMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="art_TwoThousandEighteenSeniorSecuredCreditFacilitiesMember" name="TwoThousandEighteenSeniorSecuredCreditFacilitiesMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="art_TwoThousandEighteenSeniorSecuredRevolvingCreditFacilityMember" name="TwoThousandEighteenSeniorSecuredRevolvingCreditFacilityMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="art_TwoThousandFifteenSeniorSecuredCreditFacilitiesMemberMember" name="TwoThousandFifteenSeniorSecuredCreditFacilitiesMemberMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="art_TwoThousandTenMortgageLoansComponentA1Member" name="TwoThousandTenMortgageLoansComponentA1Member" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="art_TwoThousandTenMortgageLoansComponentA2FLMember" name="TwoThousandTenMortgageLoansComponentA2FLMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="art_TwoThousandTenMortgageLoansComponentA2FXMember" name="TwoThousandTenMortgageLoansComponentA2FXMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="art_TwoThousandTenMortgageLoansComponentBMember" name="TwoThousandTenMortgageLoansComponentBMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="art_TwoThousandTenMortgageLoansComponentCMember" name="TwoThousandTenMortgageLoansComponentCMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="art_TwoThousandTenMortgageLoansComponentDMember" name="TwoThousandTenMortgageLoansComponentDMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="art_TwoThousandTenMortgageLoansMember" name="TwoThousandTenMortgageLoansMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="art_TwoThousandThirteenMortgageLoansMember" name="TwoThousandThirteenMortgageLoansMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="art_TwoThousandThirteenMortgageLoansMezzanineAMember" name="TwoThousandThirteenMortgageLoansMezzanineAMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="art_TwoThousandThirteenMortgageLoansMezzanineBMember" name="TwoThousandThirteenMortgageLoansMezzanineBMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="art_TwoThousandThirteenMortgageLoansSeniorNoteMember" name="TwoThousandThirteenMortgageLoansSeniorNoteMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="art_WarehouseClearfieldUTMember" name="WarehouseClearfieldUTMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="art_WarehouseClearfieldUTandMiddleboroMAMember" name="WarehouseClearfieldUTandMiddleboroMAMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="art_WarehouseRentAndStorageMember" name="WarehouseRentAndStorageMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="art_WarehouseSegmentMember" name="WarehouseSegmentMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="art_WarehouseServicesMember" name="WarehouseServicesMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="art_YFARTHoldingsL.P.Member" name="YFARTHoldingsL.P.Member" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
</xsd:schema>


