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  <xs:element id="sond_DebtInstrumentNumberOfQuarterlyPayments" abstract="false" name="DebtInstrumentNumberOfQuarterlyPayments" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:integerItemType"/>
  <xs:element id="sond_LineOfCreditFacilityFrontingFeePercentage" abstract="false" name="LineOfCreditFacilityFrontingFeePercentage" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <xs:element id="sond_NPAWaiverObligationMember" abstract="true" name="NPAWaiverObligationMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="sond_DelayedDrawWarrantsMember" abstract="true" name="DelayedDrawWarrantsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="sond_PrivatePlacementTrancheOneMember" abstract="true" name="PrivatePlacementTrancheOneMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="sond_PreferredStockCumulativeDividendPeriodsAxis" abstract="true" name="PreferredStockCumulativeDividendPeriodsAxis" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrldt:dimensionItem" type="xbrli:stringItemType"/>
  <xs:element id="sond_PreferredStockCumulativeDividendPeriodsDomain" abstract="true" name="PreferredStockCumulativeDividendPeriodsDomain" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="sond_CumulativeDividendPeriodOneMember" abstract="true" name="CumulativeDividendPeriodOneMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="sond_CumulativeDividendPeriodTwoMember" abstract="true" name="CumulativeDividendPeriodTwoMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="sond_CumulativeDividendPeriodThreeMember" abstract="true" name="CumulativeDividendPeriodThreeMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="sond_SaleOfStockNumberOfTranches" abstract="false" name="SaleOfStockNumberOfTranches" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:integerItemType"/>
  <xs:element id="sond_ShareholderSpecialMeetingPeriodMaximum" abstract="false" name="ShareholderSpecialMeetingPeriodMaximum" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:durationItemType"/>
  <xs:element id="sond_NumberOfFreestandingFinancialInstruments" abstract="false" name="NumberOfFreestandingFinancialInstruments" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:integerItemType"/>
  <xs:element id="sond_SaleOfStockFutureEquityOfferingRightToPurchasePercentage" abstract="false" name="SaleOfStockFutureEquityOfferingRightToPurchasePercentage" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <xs:element id="sond_SaleOfStockFutureEquityOfferingRightToPurchasePurchasePricePercentage" abstract="false" name="SaleOfStockFutureEquityOfferingRightToPurchasePurchasePricePercentage" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <xs:element id="sond_PreferredStockDividendApprovalPercentage" abstract="false" name="PreferredStockDividendApprovalPercentage" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <xs:element id="sond_PreferredStockDividendRestrictionsCashFlow" abstract="false" name="PreferredStockDividendRestrictionsCashFlow" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="sond_PreferredStockConvertibleUndiscountedConversionPrice" abstract="false" name="PreferredStockConvertibleUndiscountedConversionPrice" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="dtr-types:perShareItemType"/>
  <xs:element id="sond_PreferredStockConvertibleConversionPriceDiscountPercent" abstract="false" name="PreferredStockConvertibleConversionPriceDiscountPercent" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <xs:element id="sond_PreferredStockConvertibleThresholdTradingDays" abstract="false" name="PreferredStockConvertibleThresholdTradingDays" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:integerItemType"/>
  <xs:element id="sond_PreferredStockNumberOfVotesPerShare" abstract="false" name="PreferredStockNumberOfVotesPerShare" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:decimalItemType"/>
  <xs:element id="sond_GeneralCommonStockMember" abstract="true" name="GeneralCommonStockMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="sond_SpecialVotingStockMember" abstract="true" name="SpecialVotingStockMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="sond_FormerSeriesCAndDPreferredStockWarrantsMember" abstract="true" name="FormerSeriesCAndDPreferredStockWarrantsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="sond_SonderLegacyWarrantsMember" abstract="true" name="SonderLegacyWarrantsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="sond_RecapitalizationExchangeRatio" abstract="false" name="RecapitalizationExchangeRatio" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:pureItemType"/>
  <xs:element id="sond_AdjustmentsToAdditionalPaidInCapitalLiabilityComponentReclassifiedToEquity" abstract="false" name="AdjustmentsToAdditionalPaidInCapitalLiabilityComponentReclassifiedToEquity" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="sond_SharesAuthorized" abstract="false" name="SharesAuthorized" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:sharesItemType"/>
  <xs:element id="sond_CommonStockIssuancePrice" abstract="false" name="CommonStockIssuancePrice" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="dtr-types1:perShareItemType"/>
  <xs:element id="sond_CommonStockLiquidationPreferenceValue" abstract="false" name="CommonStockLiquidationPreferenceValue" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="sond_ExchangeableCommonStockMember" abstract="true" name="ExchangeableCommonStockMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="sond_SeiesCAndDPreferredStockMember" abstract="true" name="SeiesCAndDPreferredStockMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="sond_MarketStockUnitsMember" abstract="true" name="MarketStockUnitsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="sond_DelayedDrawNoteWarrantLiabilityMember" abstract="true" name="DelayedDrawNoteWarrantLiabilityMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="sond_SonderHoldingsInc2021EquityIncentivePlanMember" abstract="true" name="SonderHoldingsInc2021EquityIncentivePlanMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="sond_SonderHoldingsInc2023InducementEquityIncentivePlanMember" abstract="true" name="SonderHoldingsInc2023InducementEquityIncentivePlanMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="sond_ServiceBasedAwardsMember" abstract="true" name="ServiceBasedAwardsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="sond_MarketCapitalizationUnitsMember" abstract="true" name="MarketCapitalizationUnitsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="sond_A2021CEOOptionAwardMember" abstract="true" name="A2021CEOOptionAwardMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="sond_A2013StockOptionAndGrantPlanMember" abstract="true" name="A2013StockOptionAndGrantPlanMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="sond_SonderHoldingsInc2021ManagementEquityIncentivePlanMember" abstract="true" name="SonderHoldingsInc2021ManagementEquityIncentivePlanMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="sond_SonderHoldingsInc2021EmployeeStockPurchasePlanMember" abstract="true" name="SonderHoldingsInc2021EmployeeStockPurchasePlanMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="sond_PromissoryNoteMember" abstract="true" name="PromissoryNoteMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="sond_ShareBasedPaymentArrangementTrancheFourMember" abstract="true" name="ShareBasedPaymentArrangementTrancheFourMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="sond_ShareBasedPaymentArrangementTrancheFiveMember" abstract="true" name="ShareBasedPaymentArrangementTrancheFiveMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="sond_ShareBasedPaymentArrangementTrancheSixMember" abstract="true" name="ShareBasedPaymentArrangementTrancheSixMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="sond_ThePromissoryNoteMember" abstract="true" name="ThePromissoryNoteMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="sond_ShareBasedCompensationArrangementByShareBasedPaymentAwardPercentageOfOutstandingStockFromPrecedingCalendarYearMaximum" abstract="false" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardPercentageOfOutstandingStockFromPrecedingCalendarYearMaximum" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:percentItemType"/>
  <xs:element id="sond_ShareBasedCompensationArrangementByShareBasedPaymentAwardConsecutiveOfferingPeriod" abstract="false" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardConsecutiveOfferingPeriod" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:durationItemType"/>
  <xs:element id="sond_EmployeeStockPurchasePlanSharesAuthorizedForIssuance" abstract="false" name="EmployeeStockPurchasePlanSharesAuthorizedForIssuance" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:sharesItemType"/>
  <xs:element id="sond_ShareBasedCompensationArrangementByShareBasedPaymentAwardPlanModificationOptionsNumber" abstract="false" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardPlanModificationOptionsNumber" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:sharesItemType"/>
  <xs:element id="sond_ShareBasedCompensationArrangementByShareBasedPaymentAwardPlanModificationOptionsReducedExercisePrice" abstract="false" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardPlanModificationOptionsReducedExercisePrice" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="dtr-types1:perShareItemType"/>
  <xs:element id="sond_ShareBasedPaymentArrangementExpenseTotalIncrementalExpenseToBeRecognizedOverTheRemainingRequisiteServicePeriod" abstract="false" name="ShareBasedPaymentArrangementExpenseTotalIncrementalExpenseToBeRecognizedOverTheRemainingRequisiteServicePeriod" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="sond_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingRightsMonthlyInstallments" abstract="false" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingRightsMonthlyInstallments" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:integerItemType"/>
  <xs:element id="sond_TreasuryStockSharesAcquiredInSettlementOfDebt" abstract="false" name="TreasuryStockSharesAcquiredInSettlementOfDebt" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:sharesItemType"/>
  <xs:element id="sond_TreasuryStockValueAcquiredInSettlementOfDebt" abstract="false" name="TreasuryStockValueAcquiredInSettlementOfDebt" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="sond_CommonStockCapitalSharesMarketCapitalizationEstimatedPrice" abstract="false" name="CommonStockCapitalSharesMarketCapitalizationEstimatedPrice" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="sond_CommonStockCapitalSharesMarketCapitalisationEstimatedPerShare" abstract="false" name="CommonStockCapitalSharesMarketCapitalisationEstimatedPerShare" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="dtr-types1:perShareItemType"/>
  <xs:element id="sond_CommonStockCapitalSharesMarketCapitalizationAdjustmentsPerShare" abstract="false" name="CommonStockCapitalSharesMarketCapitalizationAdjustmentsPerShare" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="dtr-types1:perShareItemType"/>
  <xs:element id="sond_CommonStockCapitalSharesMarketCapitalisationOptionAwardMarketPricePerShareYearOne" abstract="false" name="CommonStockCapitalSharesMarketCapitalisationOptionAwardMarketPricePerShareYearOne" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:perShareItemType"/>
  <xs:element id="sond_CommonStockCapitalSharesMarketCapitalisationOptionAwardMarketPricePerShareYearTwo" abstract="false" name="CommonStockCapitalSharesMarketCapitalisationOptionAwardMarketPricePerShareYearTwo" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:perShareItemType"/>
  <xs:element id="sond_CommonStockCapitalSharesMarketCapitalisationOptionAwardMarketPricePerShareYearThree" abstract="false" name="CommonStockCapitalSharesMarketCapitalisationOptionAwardMarketPricePerShareYearThree" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:perShareItemType"/>
  <xs:element id="sond_CommonStockCapitalSharesMarketCapitalisationOptionAwardAdjustedMarketPricePerShareYearThree" abstract="false" name="CommonStockCapitalSharesMarketCapitalisationOptionAwardAdjustedMarketPricePerShareYearThree" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:perShareItemType"/>
  <xs:element id="sond_CommonStockCapitalSharesMarketCapitalisationOptionAwardAdjustedMarketPricePerShareYearFour" abstract="false" name="CommonStockCapitalSharesMarketCapitalisationOptionAwardAdjustedMarketPricePerShareYearFour" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:perShareItemType"/>
  <xs:element id="sond_CommonStockCapitalSharesMarketCapitalisationOptionAwardAdjustedMarketPricePerShareYearFive" abstract="false" name="CommonStockCapitalSharesMarketCapitalisationOptionAwardAdjustedMarketPricePerShareYearFive" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:perShareItemType"/>
  <xs:element id="sond_ShareBasedCompensationArrangementByShareBasedPaymentAwardTriggeringEvents" abstract="false" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardTriggeringEvents" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:integerItemType"/>
  <xs:element id="sond_OperatingCostsAndExpensesMember" abstract="true" name="OperatingCostsAndExpensesMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="sond_ExchangeablePreferredAndCommonStockMember" abstract="true" name="ExchangeablePreferredAndCommonStockMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="sond_BroadStreetInvestigationMember" abstract="true" name="BroadStreetInvestigationMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="sond_NumberOfSuretyProviders" abstract="false" name="NumberOfSuretyProviders" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:integerItemType"/>
  <xs:element id="sond_LitigationSettlementNumberOfPaymentTranches" abstract="false" name="LitigationSettlementNumberOfPaymentTranches" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:integerItemType"/>
  <xs:element id="sond_LossContingencyEstimatedAccrualLiabilityRelatedToTaxMatters" abstract="false" name="LossContingencyEstimatedAccrualLiabilityRelatedToTaxMatters" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="sond_EffectiveIncomeTaxRateReconciliationConvertibleDebtInstruments" abstract="false" name="EffectiveIncomeTaxRateReconciliationConvertibleDebtInstruments" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="sond_EffectiveIncomeTaxRateReconciliationCapitalLoss" abstract="false" name="EffectiveIncomeTaxRateReconciliationCapitalLoss" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="sond_EffectiveIncomeTaxRateReconciliationLeaseAdjustmentsAmount" abstract="false" name="EffectiveIncomeTaxRateReconciliationLeaseAdjustmentsAmount" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="sond_DeferredTaxAssetsFixedAndIntangibleAssets" abstract="false" name="DeferredTaxAssetsFixedAndIntangibleAssets" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="sond_DeferredTaxAssetsOtherAssets" abstract="false" name="DeferredTaxAssetsOtherAssets" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="sond_DeferredTaxAssetsCapitalizedResearchAndDevelopment" abstract="false" name="DeferredTaxAssetsCapitalizedResearchAndDevelopment" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="sond_DeferredTaxAssetsLeasingArrangements" abstract="false" name="DeferredTaxAssetsLeasingArrangements" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="sond_IncomeTaxExpenseBenefitTable" abstract="true" name="IncomeTaxExpenseBenefitTable" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrldt:hypercubeItem" type="xbrli:stringItemType"/>
  <xs:element id="sond_IncomeTaxExpenseBenefitLineItems" abstract="true" name="IncomeTaxExpenseBenefitLineItems" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="sond_OperatingLossCarryforwardsSubjectToExpiration" abstract="false" name="OperatingLossCarryforwardsSubjectToExpiration" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="sond_OperatingLossCarryforwardsNotSubjectToExpiration" abstract="false" name="OperatingLossCarryforwardsNotSubjectToExpiration" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="sond_CorporateEmployeesMember" abstract="true" name="CorporateEmployeesMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="sond_ReductionInForceMember" abstract="true" name="ReductionInForceMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="sond_March2023RestructuringMember" abstract="true" name="March2023RestructuringMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="sond_April2025SecuritiesPurchaseAgreementsMember" abstract="true" name="April2025SecuritiesPurchaseAgreementsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="sond_VotingSupportAgreementMember" abstract="true" name="VotingSupportAgreementMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="sond_LicenseAgreementMarriottInternationalInc.AndGlobalHospitalityLicensingS.AR.LMember" abstract="true" name="LicenseAgreementMarriottInternationalInc.AndGlobalHospitalityLicensingS.AR.LMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="sond_NPAWarrantsMember" abstract="true" name="NPAWarrantsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="sond_ConvertiblePreferredStockSharesIssuedUponConversionLimitPercent" abstract="false" name="ConvertiblePreferredStockSharesIssuedUponConversionLimitPercent" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <xs:element id="sond_CommonStockProposedSharesAuthorized" abstract="false" name="CommonStockProposedSharesAuthorized" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:sharesItemType"/>
  <xs:element id="sond_SaleOfStockSubsequentPurchaseLimitPercent" abstract="false" name="SaleOfStockSubsequentPurchaseLimitPercent" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <xs:element id="sond_SaleOfStockPurchaseMarketPricePercent" abstract="false" name="SaleOfStockPurchaseMarketPricePercent" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <xs:element id="sond_VotingPercentageOfStockholders" abstract="false" name="VotingPercentageOfStockholders" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <xs:element id="sond_DebtInstrumentDebtCancellationPercent" abstract="false" name="DebtInstrumentDebtCancellationPercent" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <xs:element id="sond_ClassOfWarrantOrRightBeneficialConversionLimitPercent" abstract="false" name="ClassOfWarrantOrRightBeneficialConversionLimitPercent" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <xs:element id="sond_ClassOfWarrantOrRightBeneficialConversionChangeLimitPercent" abstract="false" name="ClassOfWarrantOrRightBeneficialConversionChangeLimitPercent" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <xs:element id="sond_ClassOfWarrantOrRightBeneficialConversionNoticeRequired" abstract="false" name="ClassOfWarrantOrRightBeneficialConversionNoticeRequired" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:durationItemType"/>
  <xs:element id="sond_LicenseAgreementAmount" abstract="false" name="LicenseAgreementAmount" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
</xs:schema>
