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  <xs:element id="kltr_AdjustmentsToAdditionalPaidInCapitalSettlementOfEquityClassifiedShareBasedPaymentAwards" abstract="false" name="AdjustmentsToAdditionalPaidInCapitalSettlementOfEquityClassifiedShareBasedPaymentAwards" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="kltr_NonCashInterestExpenseIncome" abstract="false" name="NonCashInterestExpenseIncome" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="kltr_IncreaseInDeferredContractAcquisitionAndFulfillmentCosts" abstract="false" name="IncreaseInDeferredContractAcquisitionAndFulfillmentCosts" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="kltr_OperatingLeaseRightOfUseAssetsAndLeaseLiabilitiesNet" abstract="false" name="OperatingLeaseRightOfUseAssetsAndLeaseLiabilitiesNet" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="kltr_PaymentsForCashSettlementOfEquityClassifiedShareBasedPaymentAwards" abstract="false" name="PaymentsForCashSettlementOfEquityClassifiedShareBasedPaymentAwards" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="kltr_PaymentsOfStockIssuanceCostsNet" abstract="false" name="PaymentsOfStockIssuanceCostsNet" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="kltr_PendingProceedsFromOptionExercises" abstract="false" name="PendingProceedsFromOptionExercises" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="kltr_CashSettlementOfEquityClassifiedShareBasedPaymentAwardsUnpaid" abstract="false" name="CashSettlementOfEquityClassifiedShareBasedPaymentAwardsUnpaid" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="kltr_SelectedStatementOfOperationsDataAbstract" abstract="true" name="SelectedStatementOfOperationsDataAbstract" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="kltr_ScheduleOfSharesOfCommonStockReservedForFutureIssuanceTableTextBlock" abstract="false" name="ScheduleOfSharesOfCommonStockReservedForFutureIssuanceTableTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:textBlockItemType"/>
  <xs:element id="kltr_CustomerAMember" abstract="true" name="CustomerAMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="kltr_ESelf.AILtd.Member" abstract="true" name="ESelf.AILtd.Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="kltr_BusinessCombinationEquityConsiderationPlacedInEscrowReleasePeriod" abstract="false" name="BusinessCombinationEquityConsiderationPlacedInEscrowReleasePeriod" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:durationItemType"/>
  <xs:element id="kltr_BusinessCombinationEquityConsiderationPlacedInEscrowReleasePeriodFollowingAcquisition" abstract="false" name="BusinessCombinationEquityConsiderationPlacedInEscrowReleasePeriodFollowingAcquisition" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:durationItemType"/>
  <xs:element id="kltr_BusinessCombinationContingentConsiderationMaximumTargetAchievablePercent" abstract="false" name="BusinessCombinationContingentConsiderationMaximumTargetAchievablePercent" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <xs:element id="kltr_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssetsAcquiredIncludingGoodwill" abstract="false" name="BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssetsAcquiredIncludingGoodwill" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="kltr_BusinessCombinationRecognizedLiabilityAssumedAccruedExpensesAndOtherCurrentLiabilities" abstract="false" name="BusinessCombinationRecognizedLiabilityAssumedAccruedExpensesAndOtherCurrentLiabilities" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="kltr_EnterpriseEducationAndTechnologySegmentMember" abstract="true" name="EnterpriseEducationAndTechnologySegmentMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="kltr_MediaAndTelecomSegmentMember" abstract="true" name="MediaAndTelecomSegmentMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="kltr_RevenueFromContractWithCustomerExcludingAssessedTaxPercent" abstract="false" name="RevenueFromContractWithCustomerExcludingAssessedTaxPercent" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <xs:element id="kltr_OtherCountriesMember" abstract="true" name="OtherCountriesMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="kltr_CostsToObtainContractMember" abstract="true" name="CostsToObtainContractMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="kltr_CostsToFulfillContractMember" abstract="true" name="CostsToFulfillContractMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="kltr_CapitalizedContractCostRollForward" abstract="true" name="CapitalizedContractCostRollForward" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="kltr_AdditionsToDeferredContractCostsDuringPeriod" abstract="false" name="AdditionsToDeferredContractCostsDuringPeriod" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="kltr_AvailableForSaleMaturitiesWithinOneYearGrossUnrealizedGains" abstract="false" name="AvailableForSaleMaturitiesWithinOneYearGrossUnrealizedGains" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="kltr_AvailableForSaleMaturesWithinOneYearGrossUnrealizedLosses" abstract="false" name="AvailableForSaleMaturesWithinOneYearGrossUnrealizedLosses" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="kltr_AvailableForSaleMaturesAfterOneYearGrossUnrealizedGains" abstract="false" name="AvailableForSaleMaturesAfterOneYearGrossUnrealizedGains" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="kltr_AvailableForSaleMaturesAfterOneYearGrossUnrealizedLosses" abstract="false" name="AvailableForSaleMaturesAfterOneYearGrossUnrealizedLosses" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="kltr_RestrictedBankDepositCurrentFairValueDisclosure" abstract="false" name="RestrictedBankDepositCurrentFairValueDisclosure" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="kltr_RestrictedBankDepositNoncurrentFairValueDisclosure" abstract="false" name="RestrictedBankDepositNoncurrentFairValueDisclosure" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="kltr_EarnOutConsiderationMember" abstract="true" name="EarnOutConsiderationMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="kltr_LesseeOperatingLeaseLiabilityToBePaidAfterYearFour" abstract="false" name="LesseeOperatingLeaseLiabilityToBePaidAfterYearFour" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="kltr_SeverancePayFund" abstract="false" name="SeverancePayFund" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="kltr_StockOptionsRSUsMember" abstract="true" name="StockOptionsRSUsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="kltr_EnterpriseEducationAndTechnologyMember" abstract="true" name="EnterpriseEducationAndTechnologyMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="kltr_MediaAndTelecomMember" abstract="true" name="MediaAndTelecomMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="kltr_TermLoanFacilityMember" abstract="true" name="TermLoanFacilityMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="kltr_TheRevolvingCreditFacilityMember" abstract="true" name="TheRevolvingCreditFacilityMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="kltr_CreditAgreementMember" abstract="true" name="CreditAgreementMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="kltr_AlternateBaseRateMember" abstract="true" name="AlternateBaseRateMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="kltr_AdjustedTermSecuredOvernightFinancingRateMember" abstract="true" name="AdjustedTermSecuredOvernightFinancingRateMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="kltr_AlternateBaseRateFederalFundsEffectiveRateMember" abstract="true" name="AlternateBaseRateFederalFundsEffectiveRateMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="kltr_InstallmentPaymentDateAxis" abstract="true" name="InstallmentPaymentDateAxis" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrldt:dimensionItem" type="xbrli:stringItemType"/>
  <xs:element id="kltr_InstallmentPaymentDateDomain" abstract="true" name="InstallmentPaymentDateDomain" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="kltr_PeriodPaymentPeriod1Member" abstract="true" name="PeriodPaymentPeriod1Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="kltr_PeriodPaymentPeriod2Member" abstract="true" name="PeriodPaymentPeriod2Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="kltr_PeriodPaymentPeriod3Member" abstract="true" name="PeriodPaymentPeriod3Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="kltr_PeriodPaymentPeriod4Member" abstract="true" name="PeriodPaymentPeriod4Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="kltr_DebtInstrumentPermittedRestrictedPaymentsAggregateAmount" abstract="false" name="DebtInstrumentPermittedRestrictedPaymentsAggregateAmount" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="kltr_DebtInstrumentBasisSpreadOnVariableRateFloor" abstract="false" name="DebtInstrumentBasisSpreadOnVariableRateFloor" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <xs:element id="kltr_A2021PlanMember" abstract="true" name="A2021PlanMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="kltr_A2025ShareRepurchaseProgramMember" abstract="true" name="A2025ShareRepurchaseProgramMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="kltr_SpecialSituationsInvestingGroupIILLCMember" abstract="true" name="SpecialSituationsInvestingGroupIILLCMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="kltr_CommonStockCapitalSharesReservedForFutureIssuanceIncreaseDecrease" abstract="false" name="CommonStockCapitalSharesReservedForFutureIssuanceIncreaseDecrease" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:sharesItemType"/>
  <xs:element id="kltr_TreasuryStockDiscount" abstract="false" name="TreasuryStockDiscount" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <xs:element id="kltr_FinancialIncomeAbstract" abstract="true" name="FinancialIncomeAbstract" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="kltr_FinancialIncome" abstract="false" name="FinancialIncome" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="kltr_FinancialExpensesAbstract" abstract="true" name="FinancialExpensesAbstract" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="kltr_BankFees" abstract="false" name="BankFees" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="kltr_FinancialExpenses" abstract="false" name="FinancialExpenses" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="kltr_PathFactoryHoldingsULCMember" abstract="true" name="PathFactoryHoldingsULCMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
</xs:schema>
