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  <xs:element id="oust_StockIssuedDuringPeriodValueReverseRecapitalization" abstract="false" name="StockIssuedDuringPeriodValueReverseRecapitalization" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="oust_DebtInstrumentCollateralAmountPercentOfSecuritiesInForeignSubsidiaries" abstract="false" name="DebtInstrumentCollateralAmountPercentOfSecuritiesInForeignSubsidiaries" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <xs:element id="oust_PublicWarrantsMember" abstract="true" name="PublicWarrantsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="oust_BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuableAdjustment" abstract="false" name="BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuableAdjustment" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="oust_ClassOfWarrantOrRightValueOfSecuritiesCalledByWarrantsOrRightsPercentageOfOutstandingLoan" abstract="false" name="ClassOfWarrantOrRightValueOfSecuritiesCalledByWarrantsOrRightsPercentageOfOutstandingLoan" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:pureItemType"/>
  <xs:element id="oust_WarrantsAcquiredInMerger" abstract="false" name="WarrantsAcquiredInMerger" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="oust_SaleOfStockAuthorizedAmount" abstract="false" name="SaleOfStockAuthorizedAmount" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="oust_DebtInstrumentPrepaymentScenarioAxis" abstract="true" name="DebtInstrumentPrepaymentScenarioAxis" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrldt:dimensionItem" type="xbrli:stringItemType"/>
  <xs:element id="oust_HerculesLoanAndSecurityAgreementMember" abstract="true" name="HerculesLoanAndSecurityAgreementMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="oust_DebtInstrumentEndOfTermCharge" abstract="false" name="DebtInstrumentEndOfTermCharge" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="oust_UninvoicedReceiptsOtherCurrentLiabilities" abstract="false" name="UninvoicedReceiptsOtherCurrentLiabilities" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="oust_StockCancelledDuringPeriodSharesAcquisitions" abstract="false" name="StockCancelledDuringPeriodSharesAcquisitions" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:sharesItemType"/>
  <xs:element id="oust_OtherVendorsMember" abstract="true" name="OtherVendorsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="oust_SaleOfWarrantPricePerShare" abstract="false" name="SaleOfWarrantPricePerShare" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="dtr-types:perShareItemType"/>
  <xs:element id="oust_ReverseRecapitalizationOfferingCost" abstract="false" name="ReverseRecapitalizationOfferingCost" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="oust_TemporaryEquityTextBlock" abstract="false" name="TemporaryEquityTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:textBlockItemType"/>
  <xs:element id="oust_DenominatorAbstract" abstract="true" name="DenominatorAbstract" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="oust_ApplicableInterestRateAtTheTimeOfDefaultMember" abstract="true" name="ApplicableInterestRateAtTheTimeOfDefaultMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="oust_CommonStockAndTemporaryEquityParOrStatedValuePerShare" abstract="false" name="CommonStockAndTemporaryEquityParOrStatedValuePerShare" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="dtr-types:perShareItemType"/>
  <xs:element id="oust_TermLoanMember" abstract="true" name="TermLoanMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="oust_ConversionOfCanceledCLAUnitsToOusterCommonStockMember" abstract="true" name="ConversionOfCanceledCLAUnitsToOusterCommonStockMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="oust_ProceedsFromIssuanceOfCommonStockNetOfIssuanceCosts" abstract="false" name="ProceedsFromIssuanceOfCommonStockNetOfIssuanceCosts" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="oust_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsUnvestedEarlyExercisedCommonStockOptionsMember" abstract="true" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsUnvestedEarlyExercisedCommonStockOptionsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="oust_WeightedAverageRemainingContractualTermAbstract" abstract="true" name="WeightedAverageRemainingContractualTermAbstract" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="oust_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentAssets" abstract="false" name="BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentAssets" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="oust_RedeemableConvertiblePreferredStockWarrantLiabilityMember" abstract="true" name="RedeemableConvertiblePreferredStockWarrantLiabilityMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="oust_DebtInstrumentCovenantTermUnrestrictedCashBalanceRequired" abstract="false" name="DebtInstrumentCovenantTermUnrestrictedCashBalanceRequired" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="oust_TemporaryEquityConversionOfTemporaryEquityToCommonStockShares" abstract="false" name="TemporaryEquityConversionOfTemporaryEquityToCommonStockShares" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:sharesItemType"/>
  <xs:element id="oust_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsCancellationsInPeriodWeightedAverageExercisePrice" abstract="false" name="ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsCancellationsInPeriodWeightedAverageExercisePrice" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:perShareItemType"/>
  <xs:element id="oust_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsUnvestedExercisesInPeriod" abstract="false" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsUnvestedExercisesInPeriod" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:sharesItemType"/>
  <xs:element id="oust_RedeemableConvertiblePreferredStockWarrantsMember" abstract="true" name="RedeemableConvertiblePreferredStockWarrantsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="oust_DebtInstrumentPrepaymentMadeAfter24MonthsFollowingTheClosingDateMember" abstract="true" name="DebtInstrumentPrepaymentMadeAfter24MonthsFollowingTheClosingDateMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="oust_ScheduleOfReverseRecapitalizationLineItems" abstract="true" name="ScheduleOfReverseRecapitalizationLineItems" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="oust_ColonnadeAcquisitionCorpMember" abstract="true" name="ColonnadeAcquisitionCorpMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="oust_SaleOfStockIssuanceCost" abstract="false" name="SaleOfStockIssuanceCost" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="oust_SeriesBPreferredStockConvertedToCommonStockMember" abstract="true" name="SeriesBPreferredStockConvertedToCommonStockMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="oust_ExercisePriceRangeFourMember" abstract="true" name="ExercisePriceRangeFourMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="oust_CustomerBMember" abstract="true" name="CustomerBMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="oust_DebtInstrumentPrepaymentScenarioDomain" abstract="true" name="DebtInstrumentPrepaymentScenarioDomain" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="oust_AggregateIntrinsicValueRollForward" abstract="true" name="AggregateIntrinsicValueRollForward" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="oust_ExercisePriceRangeFiveMember" abstract="true" name="ExercisePriceRangeFiveMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="oust_TemporaryEquityStockIssuedDuringPeriodSharesNewIssues" abstract="false" name="TemporaryEquityStockIssuedDuringPeriodSharesNewIssues" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:sharesItemType"/>
  <xs:element id="oust_BusinessCombinationConsiderationTransferredReplacementEquityAwardsVested" abstract="false" name="BusinessCombinationConsiderationTransferredReplacementEquityAwardsVested" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="oust_ShareBasedPaymentArrangementNumberOfEquityIncentivePlans" abstract="false" name="ShareBasedPaymentArrangementNumberOfEquityIncentivePlans" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:integerItemType"/>
  <xs:element id="oust_AccruedAndOtherLiabilitiesCurrent" abstract="false" name="AccruedAndOtherLiabilitiesCurrent" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="oust_PaymentsForCashFacilityAndLegalFees" abstract="false" name="PaymentsForCashFacilityAndLegalFees" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="oust_StockCancelledDuringPeriodValueAcquisitions" abstract="false" name="StockCancelledDuringPeriodValueAcquisitions" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="oust_ExercisePriceRangeTwoMember" abstract="true" name="ExercisePriceRangeTwoMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="oust_UnitConversionRatio" abstract="false" name="UnitConversionRatio" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:pureItemType"/>
  <xs:element id="oust_SensePhotonicsIncMember" abstract="true" name="SensePhotonicsIncMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="oust_IssuanceOfRedeemableConvertiblePreferredStockUponExerciseOfWarrants" abstract="false" name="IssuanceOfRedeemableConvertiblePreferredStockUponExerciseOfWarrants" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="oust_SupplierAMember" abstract="true" name="SupplierAMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="oust_TemporaryEquityConversionOfTemporaryEquityToCommonStockValue" abstract="false" name="TemporaryEquityConversionOfTemporaryEquityToCommonStockValue" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="oust_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndEarlyExercisedOptionsSubjectToNonrecourseNotesMember" abstract="true" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndEarlyExercisedOptionsSubjectToNonrecourseNotesMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="oust_GrossProceedsFromReverseRecapitalizationTransaction" abstract="false" name="GrossProceedsFromReverseRecapitalizationTransaction" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="oust_ConversionOfClassACommonStockToCommonStockMember" abstract="true" name="ConversionOfClassACommonStockToCommonStockMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="oust_ClassOfWarrantOrRightExercisableThresholdCommonStockPrice" abstract="false" name="ClassOfWarrantOrRightExercisableThresholdCommonStockPrice" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="dtr-types:perShareItemType"/>
  <xs:element id="oust_SaleOfStockRemainingAuthorizedAmount" abstract="false" name="SaleOfStockRemainingAuthorizedAmount" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
</xs:schema>
