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  <xs:element id="sond_StockIssuedDuringPeriodSharesConversionOfWarrants" abstract="false" name="StockIssuedDuringPeriodSharesConversionOfWarrants" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:sharesItemType"/>
  <xs:element id="sond_StockIssuedDuringPeriodSharesConversionOfNotes" abstract="false" name="StockIssuedDuringPeriodSharesConversionOfNotes" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:sharesItemType"/>
  <xs:element id="sond_StockIssuedDuringPeriodValueConversionOfNotes" abstract="false" name="StockIssuedDuringPeriodValueConversionOfNotes" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="sond_StockIssuedDuringPeriodSharesConversionOfPreferredStock" abstract="false" name="StockIssuedDuringPeriodSharesConversionOfPreferredStock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:sharesItemType"/>
  <xs:element id="sond_StockIssuedDuringPeriodValueConversionOfPreferredStock" abstract="false" name="StockIssuedDuringPeriodValueConversionOfPreferredStock" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="sond_StockIssuedDuringPeriodSharesExchangeOfSeriesAAStockToCommonStock" abstract="false" name="StockIssuedDuringPeriodSharesExchangeOfSeriesAAStockToCommonStock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:sharesItemType"/>
  <xs:element id="sond_StockIssuedDuringPeriodSharesConversionOfCommonStockReverseRecapitalization" abstract="false" name="StockIssuedDuringPeriodSharesConversionOfCommonStockReverseRecapitalization" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:sharesItemType"/>
  <xs:element id="sond_StockIssuedDuringPeriodValueConversionOfCommonStockReverseRecapitalization" abstract="false" name="StockIssuedDuringPeriodValueConversionOfCommonStockReverseRecapitalization" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="sond_StockIssuedDuringPeriodValueSPACWarrantsReverseRecapitalization" abstract="false" name="StockIssuedDuringPeriodValueSPACWarrantsReverseRecapitalization" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="sond_StockIssuedDuringPeriodValueEarnoutLiability" abstract="false" name="StockIssuedDuringPeriodValueEarnoutLiability" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="sond_StockIssuedDuringPeriodSharesConversionOfExchangeableStock" abstract="false" name="StockIssuedDuringPeriodSharesConversionOfExchangeableStock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:sharesItemType"/>
  <xs:element id="sond_StockIssuedDuringPeriodValueConversionOfExchangeableStock" abstract="false" name="StockIssuedDuringPeriodValueConversionOfExchangeableStock" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="sond_CapitalizationOfInterestOnLongTermDebt" abstract="false" name="CapitalizationOfInterestOnLongTermDebt" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="sond_DebtGainLossOnShareSettleRedemptionFeatureAndConversionOfDebt" abstract="false" name="DebtGainLossOnShareSettleRedemptionFeatureAndConversionOfDebt" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="sond_ProceedsFromExerciseOfStockOptionsAndCommonStockWarrants" abstract="false" name="ProceedsFromExerciseOfStockOptionsAndCommonStockWarrants" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="sond_SupplementalBalanceSheetInformationAbstract" abstract="true" name="SupplementalBalanceSheetInformationAbstract" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="sond_CreditRiskPolicyTextBlock" abstract="false" name="CreditRiskPolicyTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:textBlockItemType"/>
  <xs:element id="sond_OperatingCostsAndExpensesPolicyTextBlock" abstract="false" name="OperatingCostsAndExpensesPolicyTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:textBlockItemType"/>
  <xs:element id="sond_GeneralAndAdministrativeExpensePolicyTextBlock" abstract="false" name="GeneralAndAdministrativeExpensePolicyTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:textBlockItemType"/>
  <xs:element id="sond_SellingAndMarketingExpensePolicyTextBlock" abstract="false" name="SellingAndMarketingExpensePolicyTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:textBlockItemType"/>
  <xs:element id="sond_RestructuringChargesPolicyTextBlock" abstract="false" name="RestructuringChargesPolicyTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:textBlockItemType"/>
  <xs:element id="sond_ScheduleOfExchangeableSharesTableTextBlock" abstract="false" name="ScheduleOfExchangeableSharesTableTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:textBlockItemType"/>
  <xs:element id="sond_ScheduleOfCommonStockReservedForFutureIssuanceTableTextBlock" abstract="false" name="ScheduleOfCommonStockReservedForFutureIssuanceTableTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:textBlockItemType"/>
  <xs:element id="sond_ScheduleOfReverseCapitalizationTableTextBlock" abstract="false" name="ScheduleOfReverseCapitalizationTableTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:textBlockItemType"/>
  <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_SeriesAConvertiblePreferredStockMember" abstract="true" name="SeriesAConvertiblePreferredStockMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="sond_PrivatePlacementWarrantMember" abstract="true" name="PrivatePlacementWarrantMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="sond_PrivatePlacementTrancheTwoMember" abstract="true" name="PrivatePlacementTrancheTwoMember" 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_DelayedDrawNotesMember" abstract="true" name="DelayedDrawNotesMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="sond_NumberOfVariableInterestEntities" abstract="false" name="NumberOfVariableInterestEntities" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:integerItemType"/>
  <xs:element id="sond_DebtInstrumentCovenantNotInCompliance" abstract="false" name="DebtInstrumentCovenantNotInCompliance" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:integerItemType"/>
  <xs:element id="sond_DebtDefaultCurePeriod" abstract="false" name="DebtDefaultCurePeriod" nillable="true" xbrli:periodType="duration" 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:element id="sond_PostCombinationExchangeableSharesMember" abstract="true" name="PostCombinationExchangeableSharesMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="sond_NoncashOrPartNoncashAcquisitionConversionOfWarrantsAmount" abstract="false" name="NoncashOrPartNoncashAcquisitionConversionOfWarrantsAmount" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="sond_ConversionOfStockWarrantsAmountConverted" abstract="false" name="ConversionOfStockWarrantsAmountConverted" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="sond_NoncashOrPartNoncashAcquisitionDerivativeLiabilitiesAssumed" abstract="false" name="NoncashOrPartNoncashAcquisitionDerivativeLiabilitiesAssumed" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="sond_RecognitionOfSPACWarrantsReverseRecapitalization" abstract="false" name="RecognitionOfSPACWarrantsReverseRecapitalization" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="sond_NoncashOrPartCashTransactionIssuanceOfDelayedDrawWarrants" abstract="false" name="NoncashOrPartCashTransactionIssuanceOfDelayedDrawWarrants" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="sond_SPACWarrantsMember" abstract="true" name="SPACWarrantsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="sond_OtherAmericasMember" abstract="true" name="OtherAmericasMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="sond_EuropeAndMiddleEastMember" abstract="true" name="EuropeAndMiddleEastMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="sond_OtherEuropeAndMiddleEastMember" abstract="true" name="OtherEuropeAndMiddleEastMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="sond_FirstOnlineTravelAgencyMember" abstract="true" name="FirstOnlineTravelAgencyMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="sond_SecondOnlineTravelAgencyMember" abstract="true" name="SecondOnlineTravelAgencyMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="sond_ThirdOnlineTravelAgencyMember" abstract="true" name="ThirdOnlineTravelAgencyMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="sond_FourthOnlineTravelAgencyMember" abstract="true" name="FourthOnlineTravelAgencyMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="sond_CurrentAssetsOther" abstract="false" name="CurrentAssetsOther" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="sond_NonCurrentAssetsOther" abstract="false" name="NonCurrentAssetsOther" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="sond_AccruedDirectCostsCurrent" abstract="false" name="AccruedDirectCostsCurrent" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="sond_DeferredFurnitureFixturesAndEquipmentAllowancesCurrent" abstract="false" name="DeferredFurnitureFixturesAndEquipmentAllowancesCurrent" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="sond_PublicWarrantMember" abstract="true" name="PublicWarrantMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="sond_GoresMetropoulosSponsorIILLCMember" abstract="true" name="GoresMetropoulosSponsorIILLCMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="sond_RecapitalizationEarnOutSharesMember" abstract="true" name="RecapitalizationEarnOutSharesMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="sond_ReverseRecapitalizationContingentConsiderationEquityShares" abstract="false" name="ReverseRecapitalizationContingentConsiderationEquityShares" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:sharesItemType"/>
  <xs:element id="sond_WarrantsIssuedDuringPeriodValueWarrants" abstract="false" name="WarrantsIssuedDuringPeriodValueWarrants" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="sond_WarrantLiability" abstract="false" name="WarrantLiability" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="sond_ShareSettledRedemptionFeatureUponConversionMember" abstract="true" name="ShareSettledRedemptionFeatureUponConversionMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="sond_EarnoutLiabilityMember" abstract="true" name="EarnoutLiabilityMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="sond_PreferredStockWarrantsMember" abstract="true" name="PreferredStockWarrantsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="sond_OfficeEquipmentAndOtherMember" abstract="true" name="OfficeEquipmentAndOtherMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <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_ConvertiblePromissoryNoteMember" abstract="true" name="ConvertiblePromissoryNoteMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="sond_A2018LoanAndSecurityAgreementMember" abstract="true" name="A2018LoanAndSecurityAgreementMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="sond_A2022LoanAndSecurityAgreementMember" abstract="true" name="A2022LoanAndSecurityAgreementMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="sond_A2020CreditFacilityMember" abstract="true" name="A2020CreditFacilityMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="sond_A2020QubecCreditFacilityMember" abstract="true" name="A2020QubecCreditFacilityMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="sond_ConditionalRefundFinancialContributionFacilityMember" abstract="true" name="ConditionalRefundFinancialContributionFacilityMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="sond_SecuredOvernightFinancingRateSOFRMember" abstract="true" name="SecuredOvernightFinancingRateSOFRMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="sond_MasterEquipmentFinancingAgreementEFAMember" abstract="true" name="MasterEquipmentFinancingAgreementEFAMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="sond_ShareSettledRedemptionFeatureMember" abstract="true" name="ShareSettledRedemptionFeatureMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="sond_DebtInstrumentPaymentInKindInterestTerm" abstract="false" name="DebtInstrumentPaymentInKindInterestTerm" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:durationItemType"/>
  <xs:element id="sond_DebtInstrumentNumberOfQuarterlyPayments" abstract="false" name="DebtInstrumentNumberOfQuarterlyPayments" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:integerItemType"/>
  <xs:element id="sond_DebtConversionPrincipalAmountWriteOff" abstract="false" name="DebtConversionPrincipalAmountWriteOff" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="sond_WriteOffOfDebtDiscounts" abstract="false" name="WriteOffOfDebtDiscounts" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="sond_WriteOffOfAccruedInterestExpense" abstract="false" name="WriteOffOfAccruedInterestExpense" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <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_LesseeOperatingLeaseLeaseNotYetCommencedFutureLeasePayments" abstract="false" name="LesseeOperatingLeaseLeaseNotYetCommencedFutureLeasePayments" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="sond_LesseeOperatingLeaseLeaseNotYetCommencedTerm" abstract="false" name="LesseeOperatingLeaseLeaseNotYetCommencedTerm" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:durationItemType"/>
  <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_FormerSeriesCAndDPreferredStockWarrantsMember" abstract="true" name="FormerSeriesCAndDPreferredStockWarrantsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types: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_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_DelayedDrawNoteWarrantLiabilityMember" abstract="true" name="DelayedDrawNoteWarrantLiabilityMember" 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_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedTotalGrantDateFairValue" abstract="false" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedTotalGrantDateFairValue" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <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_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_DeferredTaxAssetsFixedAndIntangibleAssets" abstract="false" name="DeferredTaxAssetsFixedAndIntangibleAssets" 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_LegacySonderMember" abstract="true" name="LegacySonderMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="sond_SpecialVotingSeriesAACommonStockMember" abstract="true" name="SpecialVotingSeriesAACommonStockMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="sond_LegacySonderCommonStockholdersMember" abstract="true" name="LegacySonderCommonStockholdersMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="sond_LegacySonderSpecialVotingCommonStockholdersMember" abstract="true" name="LegacySonderSpecialVotingCommonStockholdersMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="sond_LegacySonderStockOptionHoldersMember" abstract="true" name="LegacySonderStockOptionHoldersMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="sond_NewPIPEInvestmentHoldersMember" abstract="true" name="NewPIPEInvestmentHoldersMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="sond_StockConvertedReverseRecapitalization" abstract="false" name="StockConvertedReverseRecapitalization" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:sharesItemType"/>
  <xs:element id="sond_ProceedsFromIssuanceOfPrivatePlacementNet" abstract="false" name="ProceedsFromIssuanceOfPrivatePlacementNet" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="sond_CashAcquiredThroughReverseRecapitalization" abstract="false" name="CashAcquiredThroughReverseRecapitalization" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="sond_PaymentsOfReverseRecapitalizationTransactionCosts" abstract="false" name="PaymentsOfReverseRecapitalizationTransactionCosts" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="sond_ProceedsFromReverseRecapitalizationTransactionNet" abstract="false" name="ProceedsFromReverseRecapitalizationTransactionNet" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="sond_ReverseRecapitalizationNet" abstract="false" name="ReverseRecapitalizationNet" nillable="true" xbrli:periodType="duration" 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_FrontlineEmployeesMember" abstract="true" name="FrontlineEmployeesMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1: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_CashFlowPositivePlanMember" abstract="true" name="CashFlowPositivePlanMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types: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_DebtInstrumentAdditionalCommitment" abstract="false" name="DebtInstrumentAdditionalCommitment" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="sond_LitigationSettlementPaymentTranchesAxis" abstract="true" name="LitigationSettlementPaymentTranchesAxis" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrldt:dimensionItem" type="xbrli:stringItemType"/>
  <xs:element id="sond_LitigationSettlementPaymentTranchesDomain" abstract="true" name="LitigationSettlementPaymentTranchesDomain" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="sond_LitigationSettlementPaymentTrancheOneMember" abstract="true" name="LitigationSettlementPaymentTrancheOneMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="sond_LitigationSettlementPaymentTrancheTwoMember" abstract="true" name="LitigationSettlementPaymentTrancheTwoMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="sond_LitigationSettlementPaymentTrancheThreeMember" abstract="true" name="LitigationSettlementPaymentTrancheThreeMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="sond_LitigationSettlementNumberOfPaymentTranches" abstract="false" name="LitigationSettlementNumberOfPaymentTranches" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:integerItemType"/>
  <xs:element id="sond_LicenseAgreementTerm" abstract="false" name="LicenseAgreementTerm" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:durationItemType"/>
  <xs:element id="sond_LicenseAgreementNumberOfExtensions" abstract="false" name="LicenseAgreementNumberOfExtensions" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:integerItemType"/>
  <xs:element id="sond_LicenseAgreementRenewalTerm" abstract="false" name="LicenseAgreementRenewalTerm" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:durationItemType"/>
  <xs:element id="sond_LicenseAgreementNumberOfTranches" abstract="false" name="LicenseAgreementNumberOfTranches" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:integerItemType"/>
  <xs:element id="sond_LicenseAgreementNonCompetePeriod" abstract="false" name="LicenseAgreementNonCompetePeriod" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:durationItemType"/>
  <xs:element id="sond_LicenseAgreementTerminationPeriod" abstract="false" name="LicenseAgreementTerminationPeriod" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:durationItemType"/>
  <xs:element id="sond_LicenseAgreementTerminationOwnershipChangePercentage" abstract="false" name="LicenseAgreementTerminationOwnershipChangePercentage" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <xs:element id="sond_LicenseAgreementTerminationPropertyOwnershipChangePercentage" abstract="false" name="LicenseAgreementTerminationPropertyOwnershipChangePercentage" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <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_SaleOfStockFutureEquityOfferingRightToPurchasePercentage" abstract="false" name="SaleOfStockFutureEquityOfferingRightToPurchasePercentage" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <xs:element id="sond_SaleOfStockFutureEquityOfferingRightToPurchasePeriod" abstract="false" name="SaleOfStockFutureEquityOfferingRightToPurchasePeriod" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:durationItemType"/>
  <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_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_PreferredStockChangeInTermsApprovalPercentage" abstract="false" name="PreferredStockChangeInTermsApprovalPercentage" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <xs:element id="sond_DebtIssuanceCostsNoncashAmortization" abstract="false" name="DebtIssuanceCostsNoncashAmortization" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="sond_PurchaseOfPropertyAndEquipment" abstract="false" name="PurchaseOfPropertyAndEquipment" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
</xs:schema>
