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  <xs:element id="kltr_A2020PlanMember" abstract="true" name="A2020PlanMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="kltr_CostsToFulfillContractMember" abstract="true" name="CostsToFulfillContractMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="kltr_AmortizationPeriodOfIntangibleAssetsTableTextBlock" abstract="false" name="AmortizationPeriodOfIntangibleAssetsTableTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:textBlockItemType"/>
  <xs:element id="kltr_RecentAccountingGuidanceNotYetAdoptedPolicyTextBlock" abstract="false" name="RecentAccountingGuidanceNotYetAdoptedPolicyTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:textBlockItemType"/>
  <xs:element id="kltr_LeaseIncentiveRecognizedAsLeaseholdImprovements" abstract="false" name="LeaseIncentiveRecognizedAsLeaseholdImprovements" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="kltr_EstimatedUsefulLivesOfPropertyPlantAndEquipmentTableTextBlock" abstract="false" name="EstimatedUsefulLivesOfPropertyPlantAndEquipmentTableTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:textBlockItemType"/>
  <xs:element id="kltr_BeneficiaryEnterpriseMember" abstract="true" name="BeneficiaryEnterpriseMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="kltr_NonCashInterestExpenses" abstract="false" name="NonCashInterestExpenses" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="kltr_ScheduleOfPrepaidExpensesAndOtherCurrentAssetsTableTextBlock" abstract="false" name="ScheduleOfPrepaidExpensesAndOtherCurrentAssetsTableTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:textBlockItemType"/>
  <xs:element id="kltr_DeferredTaxAssetsTaxDeferredExpenseOperatingLeaseRightOfUseAssets" abstract="false" name="DeferredTaxAssetsTaxDeferredExpenseOperatingLeaseRightOfUseAssets" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="kltr_SubscriptionMember" abstract="true" name="SubscriptionMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="kltr_TemporaryEquityStockIssuedDuringPeriodSharesNewIssues" abstract="false" name="TemporaryEquityStockIssuedDuringPeriodSharesNewIssues" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:sharesItemType"/>
  <xs:element id="kltr_AvailableForSaleMaturesWithinOneYearGrossUnrealizedLosses" abstract="false" name="AvailableForSaleMaturesWithinOneYearGrossUnrealizedLosses" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="kltr_DeferredTaxAssetsTaxDeferredExpenseOperatingLeaseLiabilities" abstract="false" name="DeferredTaxAssetsTaxDeferredExpenseOperatingLeaseLiabilities" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <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_FinancialIncomeAbstract" abstract="true" name="FinancialIncomeAbstract" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="kltr_TermLoanFacilityMember" abstract="true" name="TermLoanFacilityMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="kltr_CreditAdjustmentSpreadMember" abstract="true" name="CreditAdjustmentSpreadMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="kltr_EnterpriseDomain" abstract="true" name="EnterpriseDomain" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="kltr_OtherCountriesMember" abstract="true" name="OtherCountriesMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="kltr_ProfessionalServicesMember" abstract="true" name="ProfessionalServicesMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="kltr_StatedPercentageTypeAxis" abstract="true" name="StatedPercentageTypeAxis" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrldt:dimensionItem" type="xbrli:stringItemType"/>
  <xs:element id="kltr_LoanForgiveness" abstract="false" name="LoanForgiveness" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="kltr_AuditorInformationAbstract" abstract="true" name="AuditorInformationAbstract" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="kltr_StockIssuedDuringPeriodValueConversionOfWarrantsToCommonStock" abstract="false" name="StockIssuedDuringPeriodValueConversionOfWarrantsToCommonStock" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="kltr_InstallmentPaymentDateDomain" abstract="true" name="InstallmentPaymentDateDomain" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="kltr_ScheduleOfSharesOfCommonStockReservedForFutureIssuanceTableTextBlock" abstract="false" name="ScheduleOfSharesOfCommonStockReservedForFutureIssuanceTableTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:textBlockItemType"/>
  <xs:element id="kltr_FinancialExpensesAbstract" abstract="true" name="FinancialExpensesAbstract" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="kltr_SupplementaryCashFlowInformationRelatedToOperatingLeasesTableTextBlock" abstract="false" name="SupplementaryCashFlowInformationRelatedToOperatingLeasesTableTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:textBlockItemType"/>
  <xs:element id="kltr_EnterpriseEducationAndTechnologyMember" abstract="true" name="EnterpriseEducationAndTechnologyMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="kltr_AdditionsToDeferredContractAcquisitionCostsDuringPeriod" abstract="false" name="AdditionsToDeferredContractAcquisitionCostsDuringPeriod" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
</xs:schema>
