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<!-- Generated by DFIN XBRL Schema Document - http://www.dfinsolutions.com/ - on 02-06-2026 09:50:13 PM -->
<!-- Copyright(c) 2026 Donnelley Financial Solutions, Inc. All Rights Reserved. -->
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	<import namespace="http://xbrl.sec.gov/oef-sr/2025" schemaLocation="https://xbrl.sec.gov/oef/2025/oef-sr-2025.xsd"/>
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					<link:loc xlink:type="locator" xlink:href="#at_RIEFStrategicPartnersFundLLCSeriesSBMember" xlink:label="RIEFStrategicPartnersFundLLCSeriesSBMember"/>
					<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="LargestHoldingsDomain" xlink:to="RIEFStrategicPartnersFundLLCSeriesSBMember" order="7.0"/>
					<link:loc xlink:type="locator" xlink:href="#at_SchwabFundamentalEmergingMarketsEquityETFMember" xlink:label="SchwabFundamentalEmergingMarketsEquityETFMember"/>
					<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="LargestHoldingsDomain" xlink:to="SchwabFundamentalEmergingMarketsEquityETFMember" order="8.0"/>
					<link:loc xlink:type="locator" xlink:href="#at_GMOQualityFundClassVIMember" xlink:label="GMOQualityFundClassVIMember"/>
					<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="LargestHoldingsDomain" xlink:to="GMOQualityFundClassVIMember" order="9.0"/>
					<link:loc xlink:type="locator" xlink:href="#at_MacKayMunicipalOpportunitiesFundLPClassAMember" xlink:label="MacKayMunicipalOpportunitiesFundLPClassAMember"/>
					<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="LargestHoldingsDomain" xlink:to="MacKayMunicipalOpportunitiesFundLPClassAMember" order="10.0"/>
					<link:loc xlink:type="locator" xlink:href="#at_ISharesNationalMuniBondETFMember" xlink:label="ISharesNationalMuniBondETFMember"/>
					<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="LargestHoldingsDomain" xlink:to="ISharesNationalMuniBondETFMember" order="11.0"/>
					<link:loc xlink:type="locator" xlink:href="#at_MacKayMunicipalCreditOpportunitiesFundLPClassAMember" xlink:label="MacKayMunicipalCreditOpportunitiesFundLPClassAMember"/>
					<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="LargestHoldingsDomain" xlink:to="MacKayMunicipalCreditOpportunitiesFundLPClassAMember" order="12.0"/>
					<link:loc xlink:type="locator" xlink:href="#at_CityOfNewYork5250312053Call0312034Member" xlink:label="CityOfNewYork5250312053Call0312034Member"/>
					<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="LargestHoldingsDomain" xlink:to="CityOfNewYork5250312053Call0312034Member" order="13.0"/>
					<link:loc xlink:type="locator" xlink:href="#at_IllinoisFinanceAuthority52505152048Call05152033Member" xlink:label="IllinoisFinanceAuthority52505152048Call05152033Member"/>
					<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="LargestHoldingsDomain" xlink:to="IllinoisFinanceAuthority52505152048Call05152033Member" order="14.0"/>
					<link:loc xlink:type="locator" xlink:href="#at_NewJerseyTransportationTrustFundAuthority50006152048Call12152032Member" xlink:label="NewJerseyTransportationTrustFundAuthority50006152048Call12152032Member"/>
					<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="LargestHoldingsDomain" xlink:to="NewJerseyTransportationTrustFundAuthority50006152048Call12152032Member" order="15.0"/>
					<link:loc xlink:type="locator" xlink:href="#at_PuertoRicoSalesTaxFinancingCorpSalesTaxRevenue5000712058Call0712028Member" xlink:label="PuertoRicoSalesTaxFinancingCorpSalesTaxRevenue5000712058Call0712028Member"/>
					<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="LargestHoldingsDomain" xlink:to="PuertoRicoSalesTaxFinancingCorpSalesTaxRevenue5000712058Call0712028Member" order="16.0"/>
					<link:loc xlink:type="locator" xlink:href="#at_CountyOfMiamiDade5000712038Call0712026Member" xlink:label="CountyOfMiamiDade5000712038Call0712026Member"/>
					<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="LargestHoldingsDomain" xlink:to="CountyOfMiamiDade5000712038Call0712026Member" order="17.0"/>
					<link:loc xlink:type="locator" xlink:href="#at_RegionalTransportationDistrict5001112041Call1112026Member" xlink:label="RegionalTransportationDistrict5001112041Call1112026Member"/>
					<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="LargestHoldingsDomain" xlink:to="RegionalTransportationDistrict5001112041Call1112026Member" order="18.0"/>
					<link:loc xlink:type="locator" xlink:href="#at_MetropolitanAtlantaRapidTransitAuthority4000712035Call0712027Member" xlink:label="MetropolitanAtlantaRapidTransitAuthority4000712035Call0712027Member"/>
					<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="LargestHoldingsDomain" xlink:to="MetropolitanAtlantaRapidTransitAuthority4000712035Call0712027Member" order="19.0"/>
					<link:loc xlink:type="locator" xlink:href="#at_VictoryPioneerMultiAssetIncomeFundClassR6Member" xlink:label="VictoryPioneerMultiAssetIncomeFundClassR6Member"/>
					<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="LargestHoldingsDomain" xlink:to="VictoryPioneerMultiAssetIncomeFundClassR6Member" order="20.0"/>
					<link:loc xlink:type="locator" xlink:href="#at_ElliottAssociatesLPClassCSharesMember" xlink:label="ElliottAssociatesLPClassCSharesMember"/>
					<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="LargestHoldingsDomain" xlink:to="ElliottAssociatesLPClassCSharesMember" order="21.0"/>
					<link:loc xlink:type="locator" xlink:href="#at_GMOEquityDislocationInvestmentFundClassAMember" xlink:label="GMOEquityDislocationInvestmentFundClassAMember"/>
					<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="LargestHoldingsDomain" xlink:to="GMOEquityDislocationInvestmentFundClassAMember" order="22.0"/>
					<link:loc xlink:type="locator" xlink:href="#at_MillenniumInternationalLtdClassGGMember" xlink:label="MillenniumInternationalLtdClassGGMember"/>
					<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="LargestHoldingsDomain" xlink:to="MillenniumInternationalLtdClassGGMember" order="23.0"/>
					<link:loc xlink:type="locator" xlink:href="#at_EatonVanceGlobalMacroAbsoluteReturnAdvantageFundClassR6Member" xlink:label="EatonVanceGlobalMacroAbsoluteReturnAdvantageFundClassR6Member"/>
					<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="LargestHoldingsDomain" xlink:to="EatonVanceGlobalMacroAbsoluteReturnAdvantageFundClassR6Member" order="24.0"/>
					<link:loc xlink:type="locator" xlink:href="#at_JPMorganGlobalAllocationFundClassR6Member" xlink:label="JPMorganGlobalAllocationFundClassR6Member"/>
					<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="LargestHoldingsDomain" xlink:to="JPMorganGlobalAllocationFundClassR6Member" order="25.0"/>
					<link:loc xlink:type="locator" xlink:href="#at_LazardRathmoreAlternativeFundClassEMember" xlink:label="LazardRathmoreAlternativeFundClassEMember"/>
					<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="LargestHoldingsDomain" xlink:to="LazardRathmoreAlternativeFundClassEMember" order="26.0"/>
					<link:loc xlink:type="locator" xlink:href="#at_ISharesGoldTrustMember" xlink:label="ISharesGoldTrustMember"/>
					<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="LargestHoldingsDomain" xlink:to="ISharesGoldTrustMember" order="27.0"/>
					<link:loc xlink:type="locator" xlink:href="#at_WilshireBridgewaterManagedAlphaIrelandFundD3SharesMember" xlink:label="WilshireBridgewaterManagedAlphaIrelandFundD3SharesMember"/>
					<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="LargestHoldingsDomain" xlink:to="WilshireBridgewaterManagedAlphaIrelandFundD3SharesMember" order="28.0"/>
					<link:loc xlink:type="locator" xlink:href="#at_GMOBenchmarkFreeAllocationFundClassIVMember" xlink:label="GMOBenchmarkFreeAllocationFundClassIVMember"/>
					<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="LargestHoldingsDomain" xlink:to="GMOBenchmarkFreeAllocationFundClassIVMember" order="29.0"/>
					<link:loc xlink:type="locator" xlink:href="#at_VanguardTotalBondMarketIndexFundInstitutionalClassMember" xlink:label="VanguardTotalBondMarketIndexFundInstitutionalClassMember"/>
					<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="LargestHoldingsDomain" xlink:to="VanguardTotalBondMarketIndexFundInstitutionalClassMember" order="30.0"/>
					<link:loc xlink:type="locator" xlink:href="#at_PIMCOIncomeFundInstitutionalClassMember" xlink:label="PIMCOIncomeFundInstitutionalClassMember"/>
					<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="LargestHoldingsDomain" xlink:to="PIMCOIncomeFundInstitutionalClassMember" order="31.0"/>
					<link:loc xlink:type="locator" xlink:href="#at_DoubleLineTotalReturnBondFundIClassMember" xlink:label="DoubleLineTotalReturnBondFundIClassMember"/>
					<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="LargestHoldingsDomain" xlink:to="DoubleLineTotalReturnBondFundIClassMember" order="32.0"/>
					<link:loc xlink:type="locator" xlink:href="#at_TCWMetWestTotalReturnBondFundPlanClassMember" xlink:label="TCWMetWestTotalReturnBondFundPlanClassMember"/>
					<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="LargestHoldingsDomain" xlink:to="TCWMetWestTotalReturnBondFundPlanClassMember" order="33.0"/>
					<link:loc xlink:type="locator" xlink:href="#at_RiverCanyonTotalReturnBondFundInstitutionalClassMember" xlink:label="RiverCanyonTotalReturnBondFundInstitutionalClassMember"/>
					<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="LargestHoldingsDomain" xlink:to="RiverCanyonTotalReturnBondFundInstitutionalClassMember" order="34.0"/>
					<link:loc xlink:type="locator" xlink:href="#at_VanguardLongTermTreasuryETFMember" xlink:label="VanguardLongTermTreasuryETFMember"/>
					<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="LargestHoldingsDomain" xlink:to="VanguardLongTermTreasuryETFMember" order="35.0"/>
					<link:loc xlink:type="locator" xlink:href="#at_GMOEmergingCountryDebtFundClassVIMember" xlink:label="GMOEmergingCountryDebtFundClassVIMember"/>
					<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="LargestHoldingsDomain" xlink:to="GMOEmergingCountryDebtFundClassVIMember" order="36.0"/>
					<link:loc xlink:type="locator" xlink:href="#at_TPGTwinBrookCapitalIncomeFundIClassMember" xlink:label="TPGTwinBrookCapitalIncomeFundIClassMember"/>
					<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="LargestHoldingsDomain" xlink:to="TPGTwinBrookCapitalIncomeFundIClassMember" order="37.0"/>
					<link:loc xlink:type="locator" xlink:href="#at_AGDirectLendingFundIVAnnexLPMember" xlink:label="AGDirectLendingFundIVAnnexLPMember"/>
					<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="LargestHoldingsDomain" xlink:to="AGDirectLendingFundIVAnnexLPMember" order="38.0"/>
					<link:loc xlink:type="locator" xlink:href="#at_VanguardHighYieldCorporateFundAdmiralSharesMember" xlink:label="VanguardHighYieldCorporateFundAdmiralSharesMember"/>
					<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="LargestHoldingsDomain" xlink:to="VanguardHighYieldCorporateFundAdmiralSharesMember" order="39.0"/>
				</link:definitionLink>
				<link:definitionLink xlink:type="extended" xlink:role="http://xbrl.sec.gov/oef/role/SalesLoadOnly">
					<link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/oef/2025/oef-2025.xsd#oef_WithSalesLoadMember" xlink:label="WithSalesLoadMember"/>
				</link:definitionLink>
				<link:definitionLink xlink:type="extended" xlink:role="http://fasb.org/us-gaap/role/eedm/ExtensibleEnumerationLists">               
					<link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InvestmentTypeCategorizationMember" xlink:label="InvestmentTypeCategorizationMember"/>
					<link:loc xlink:type="locator" xlink:href="#at_OpenEndMutualFundsMember" xlink:label="OpenEndMutualFundsMember"/>
					<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="InvestmentTypeCategorizationMember" xlink:to="OpenEndMutualFundsMember" order="1.0"/>
					<link:loc xlink:type="locator" xlink:href="#at_LiabilitiesInExcessOfOtherAssetsMember" xlink:label="LiabilitiesInExcessOfOtherAssetsMember"/>
					<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="InvestmentTypeCategorizationMember" xlink:to="LiabilitiesInExcessOfOtherAssetsMember" order="2.0"/>
					<link:loc xlink:type="locator" xlink:href="#at_PrivateFundsMember" xlink:label="PrivateFundsMember"/>
					<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="InvestmentTypeCategorizationMember" xlink:to="PrivateFundsMember" order="3.0"/>
					<link:loc xlink:type="locator" xlink:href="#at_ForeignCollectiveInvestmentFundMember" xlink:label="ForeignCollectiveInvestmentFundMember"/>
					<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="InvestmentTypeCategorizationMember" xlink:to="ForeignCollectiveInvestmentFundMember" order="4.0"/>
					<link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShortTermInvestmentsMember" xlink:label="ShortTermInvestmentsMember"/>
					<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="InvestmentTypeCategorizationMember" xlink:to="ShortTermInvestmentsMember" order="5.0"/>
					<link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ExchangeTradedFundsMember" xlink:label="ExchangeTradedFundsMember"/>
					<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="InvestmentTypeCategorizationMember" xlink:to="ExchangeTradedFundsMember" order="6.0"/>
					<link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_MunicipalBondsMember" xlink:label="MunicipalBondsMember"/>
					<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="InvestmentTypeCategorizationMember" xlink:to="MunicipalBondsMember" order="7.0"/>
					<link:loc xlink:type="locator" xlink:href="#at_ClosedEndMutualFundsMember" xlink:label="ClosedEndMutualFundsMember"/>
					<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="InvestmentTypeCategorizationMember" xlink:to="ClosedEndMutualFundsMember" order="8.0"/>
					<link:loc xlink:type="locator" xlink:href="#at_OtherAssetsInExcessOfLiabilitiesMember" xlink:label="OtherAssetsInExcessOfLiabilitiesMember"/>
					<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="InvestmentTypeCategorizationMember" xlink:to="OtherAssetsInExcessOfLiabilitiesMember" order="9.0"/>
					<link:loc xlink:type="locator" xlink:href="#at_ForeignCollectiveInvestmentFundsMember" xlink:label="ForeignCollectiveInvestmentFundsMember"/>
					<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="InvestmentTypeCategorizationMember" xlink:to="ForeignCollectiveInvestmentFundsMember" order="10.0"/>
					<link:loc xlink:type="locator" xlink:href="#at_NonTradedBusinessDevelopmentCompanyMember" xlink:label="NonTradedBusinessDevelopmentCompanyMember"/>
					<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="InvestmentTypeCategorizationMember" xlink:to="NonTradedBusinessDevelopmentCompanyMember" order="11.0"/>
					<link:loc xlink:type="locator" xlink:href="#at_PrivateFundMember" xlink:label="PrivateFundMember"/>
					<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="InvestmentTypeCategorizationMember" xlink:to="PrivateFundMember" order="12.0"/>
				</link:definitionLink>
				<link:definitionLink xlink:type="extended" xlink:role="http://xbrl.sec.gov/oef/role/BroadBasedIndexOnly">               
					<link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/oef/2025/oef-2025.xsd#oef_BroadBasedIndexDomain" xlink:label="BroadBasedIndexDomain"/>
					<link:loc xlink:type="locator" xlink:href="#at_MSCIACWINetMember" xlink:label="MSCIACWINetMember"/>
					<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="BroadBasedIndexDomain" xlink:to="MSCIACWINetMember" order="1.0"/>
					<link:loc xlink:type="locator" xlink:href="#at_BloombergMunicipalBondIndexMember" xlink:label="BloombergMunicipalBondIndexMember"/>
					<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="BroadBasedIndexDomain" xlink:to="BloombergMunicipalBondIndexMember" order="2.0"/>
					<link:loc xlink:type="locator" xlink:href="#at_BloombergUSAggregateBondIndexMember" xlink:label="BloombergUSAggregateBondIndexMember"/>
					<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="BroadBasedIndexDomain" xlink:to="BloombergUSAggregateBondIndexMember" order="3.0"/>
				</link:definitionLink>
				<link:definitionLink xlink:type="extended" xlink:role="http://xbrl.sec.gov/oef/role/AdditionalIndexOnly">              
					<link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/oef/2025/oef-2025.xsd#oef_AdditionalIndexDomain" xlink:label="AdditionalIndexDomain"/>
					<link:loc xlink:type="locator" xlink:href="#at_HFRIFundOfFundsCompositeIndexMember" xlink:label="HFRIFundOfFundsCompositeIndexMember"/>
					<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="AdditionalIndexDomain" xlink:to="HFRIFundOfFundsCompositeIndexMember" order="1.0"/>
				</link:definitionLink>
				<link:definitionLink xlink:type="extended" xlink:role="http://xbrl.sec.gov/oef/role/MaturityOnly">
					<link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/oef/2025/oef-2025.xsd#oef_MaturityDomain" xlink:label="MaturityDomain"/>
				</link:definitionLink>
				<link:definitionLink xlink:type="extended" xlink:role="http://xbrl.sec.gov/oef/role/IndustrySectorOnly">
					<link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/oef/2025/oef-2025.xsd#oef_IndustrySectorDomain" xlink:label="IndustrySectorDomain"/>
				</link:definitionLink>
				<link:definitionLink xlink:type="extended" xlink:role="http://xbrl.sec.gov/oef/role/CreditQualityOnly">
					<link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/oef/2025/oef-2025.xsd#oef_CreditQualityDomain" xlink:label="CreditQualityDomain"/>
				</link:definitionLink>
				<!--GeographicRegionOnly use only for STPR-->
				<link:definitionLink xlink:type="extended" xlink:role="http://xbrl.sec.gov/oef/role/GeographicRegionOnly">
					<link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/oef/2025/oef-2025.xsd#oef_GeographicRegionDomain" xlink:label="GeographicRegionDomain"/>
				</link:definitionLink>
				<link:labelLink xlink:type="extended" xlink:role="http://www.xbrl.org/2003/role/link">               
					<link:loc xlink:type="locator" xlink:href="#at_OpenEndMutualFundsMember" xlink:label="OpenEndMutualFundsMember"/>
					<link:label xlink:type="resource" xlink:label="label_OpenEndMutualFundsMember" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">Open End Mutual Funds [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OpenEndMutualFundsMember" xlink:to="label_OpenEndMutualFundsMember"/>
					<link:loc xlink:type="locator" xlink:href="#at_LiabilitiesInExcessOfOtherAssetsMember" xlink:label="LiabilitiesInExcessOfOtherAssetsMember"/>
					<link:label xlink:type="resource" xlink:label="label_LiabilitiesInExcessOfOtherAssetsMember" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">Liabilities in Excess of Other Assets [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="LiabilitiesInExcessOfOtherAssetsMember" xlink:to="label_LiabilitiesInExcessOfOtherAssetsMember"/>
					<link:loc xlink:type="locator" xlink:href="#at_PrivateFundsMember" xlink:label="PrivateFundsMember"/>
					<link:label xlink:type="resource" xlink:label="label_PrivateFundsMember" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">Private Funds [Member]</link:label>
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					<link:loc xlink:type="locator" xlink:href="#at_ForeignCollectiveInvestmentFundMember" xlink:label="ForeignCollectiveInvestmentFundMember"/>
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					<link:label xlink:type="resource" xlink:label="label_LazardRathmoreAlternativeFundClassEMember" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">Lazard Rathmore Alternative Fund Class E [Member]</link:label>
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					<link:label xlink:type="resource" xlink:label="label_ISharesGoldTrustMember" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">iShares Gold Trust [Member]</link:label>
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					<link:label xlink:type="resource" xlink:label="label_HFRIFundOfFundsCompositeIndexMember" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">HFRI Fund of Funds Composite Index [Member]</link:label>
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	<element name="ISharesGoldTrustMember" id="at_ISharesGoldTrustMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration"/>
	<element name="WilshireBridgewaterManagedAlphaIrelandFundD3SharesMember" id="at_WilshireBridgewaterManagedAlphaIrelandFundD3SharesMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration"/>
	<element name="GMOBenchmarkFreeAllocationFundClassIVMember" id="at_GMOBenchmarkFreeAllocationFundClassIVMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration"/>
	<element name="HFRIFundOfFundsCompositeIndexMember" id="at_HFRIFundOfFundsCompositeIndexMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration"/>
	<element name="C000162347Member" id="at_C000162347Member" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration"/>
	<element name="C000194824Member" id="at_C000194824Member" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration"/>
	<element name="VanguardTotalBondMarketIndexFundInstitutionalClassMember" id="at_VanguardTotalBondMarketIndexFundInstitutionalClassMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration"/>
	<element name="PIMCOIncomeFundInstitutionalClassMember" id="at_PIMCOIncomeFundInstitutionalClassMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration"/>
	<element name="DoubleLineTotalReturnBondFundIClassMember" id="at_DoubleLineTotalReturnBondFundIClassMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration"/>
	<element name="TCWMetWestTotalReturnBondFundPlanClassMember" id="at_TCWMetWestTotalReturnBondFundPlanClassMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration"/>
	<element name="RiverCanyonTotalReturnBondFundInstitutionalClassMember" id="at_RiverCanyonTotalReturnBondFundInstitutionalClassMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration"/>
	<element name="VanguardLongTermTreasuryETFMember" id="at_VanguardLongTermTreasuryETFMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration"/>
	<element name="GMOEmergingCountryDebtFundClassVIMember" id="at_GMOEmergingCountryDebtFundClassVIMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration"/>
	<element name="TPGTwinBrookCapitalIncomeFundIClassMember" id="at_TPGTwinBrookCapitalIncomeFundIClassMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration"/>
	<element name="AGDirectLendingFundIVAnnexLPMember" id="at_AGDirectLendingFundIVAnnexLPMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration"/>
	<element name="VanguardHighYieldCorporateFundAdmiralSharesMember" id="at_VanguardHighYieldCorporateFundAdmiralSharesMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration"/>
	<element name="NonTradedBusinessDevelopmentCompanyMember" id="at_NonTradedBusinessDevelopmentCompanyMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration"/>
	<element name="PrivateFundMember" id="at_PrivateFundMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration"/>
	<element name="BloombergUSAggregateBondIndexMember" id="at_BloombergUSAggregateBondIndexMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration"/>
</schema>
