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  <xs:element id="art_SegmentContribution" abstract="false" name="SegmentContribution" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="art_OPUnitsMember" abstract="true" name="OPUnitsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="art_WarehouseRentAndStorageMember" abstract="true" name="WarehouseRentAndStorageMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="art_WarehouseServicesMember" abstract="true" name="WarehouseServicesMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="art_TransportationMember" abstract="true" name="TransportationMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="art_RevenuePerformanceObligationSatisfiedOverTimeVariableConsiderationConstrainedPercentage" abstract="false" name="RevenuePerformanceObligationSatisfiedOverTimeVariableConsiderationConstrainedPercentage" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <xs:element id="art_RevenuePerformanceObligationPaymentTerms" abstract="false" name="RevenuePerformanceObligationPaymentTerms" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:durationItemType"/>
  <xs:element id="art_RevenueRemainingPerformanceObligationSatisfactionPeriod" abstract="false" name="RevenueRemainingPerformanceObligationSatisfactionPeriod" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:durationItemType"/>
</xs:schema>
