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  <xs:element id="ofs_InvestmentConcentrationRiskMember" abstract="true" name="InvestmentConcentrationRiskMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="ofs_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersIntoLevel3Net" abstract="false" name="FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersIntoLevel3Net" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="ofs_StructuredFinanceNotesSubordinatedNotesMember" abstract="true" name="StructuredFinanceNotesSubordinatedNotesMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="ofs_StructuredFinanceNotesMezzanineDebtMember" abstract="true" name="StructuredFinanceNotesMezzanineDebtMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="ofs_StructuredFinanceSecuritiesSubordinatedNotesMember" abstract="true" name="StructuredFinanceSecuritiesSubordinatedNotesMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="ofs_StructuredFinanceSecuritiesMezzanineDebtMember" abstract="true" name="StructuredFinanceSecuritiesMezzanineDebtMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="ofs_MeasurementInputRecoveryRateMember" abstract="true" name="MeasurementInputRecoveryRateMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="ofs_MeasurementInputDiscountMarginMember" abstract="true" name="MeasurementInputDiscountMarginMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="ofs_DebtAndEquitySecuritiesRealizedGainLossMember" abstract="true" name="DebtAndEquitySecuritiesRealizedGainLossMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="ofs_DebtAndEquitySecuritiesUnrealizedGainLossMember" abstract="true" name="DebtAndEquitySecuritiesUnrealizedGainLossMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="ofs_InterestIncomeOperatingAmortizationOfNetLoanFeesMember" abstract="true" name="InterestIncomeOperatingAmortizationOfNetLoanFeesMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="ofs_InterestIncomeOperatingAccretionOfInterestIncomeMember" abstract="true" name="InterestIncomeOperatingAccretionOfInterestIncomeMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="ofs_InterestIncomeOperatingCapitalizedPaidInKindInterestAndDividendsMember" abstract="true" name="InterestIncomeOperatingCapitalizedPaidInKindInterestAndDividendsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="ofs_FeeIncomeMember" abstract="true" name="FeeIncomeMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="ofs_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfers" abstract="false" name="FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfers" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="ofs_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetDistributions" abstract="false" name="FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetDistributions" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="ofs_FairValueRecurringBasisUnobservableInputReconciliationAssetGainLossStatementOfIncomeExtensibleListNotDisclosedFlag" abstract="false" name="FairValueRecurringBasisUnobservableInputReconciliationAssetGainLossStatementOfIncomeExtensibleListNotDisclosedFlag" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="ofs_FairValueAssetRecurringBasisStillHeldUnrealizedGainLossStatementOfIncomeExtensibleListNotDisclosedFlag" abstract="false" name="FairValueAssetRecurringBasisStillHeldUnrealizedGainLossStatementOfIncomeExtensibleListNotDisclosedFlag" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="ofs_BancOfCaliforniaCreditFacilityMember" abstract="true" name="BancOfCaliforniaCreditFacilityMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="ofs_UnsecuredNotesDueFebruary2026Member" abstract="true" name="UnsecuredNotesDueFebruary2026Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="ofs_UnsecuredNotesDueJuly2028Member" abstract="true" name="UnsecuredNotesDueJuly2028Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="ofs_UnsecuredNotesDueOctober2028Member" abstract="true" name="UnsecuredNotesDueOctober2028Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="ofs_UnsecuredNotesDueAugust2029Member" abstract="true" name="UnsecuredNotesDueAugust2029Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="ofs_SBADebenturesMember" abstract="true" name="SBADebenturesMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="ofs_OFSCCFSLLCMember" abstract="true" name="OFSCCFSLLCMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="ofs_DebtInstrumentFloorInterestRate" abstract="false" name="DebtInstrumentFloorInterestRate" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <xs:element id="ofs_LineOfCreditFacilityMaximumBorrowingAvailabilityLimit" abstract="false" name="LineOfCreditFacilityMaximumBorrowingAvailabilityLimit" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <xs:element id="ofs_UnsecuredNotesDueJuly2028OverallotmentsMember" abstract="true" name="UnsecuredNotesDueJuly2028OverallotmentsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="ofs_DebtIssuanceCostsUnderwritingFeesGross" abstract="false" name="DebtIssuanceCostsUnderwritingFeesGross" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="ofs_DebtIssuanceCostsOfferingExpensesGross" abstract="false" name="DebtIssuanceCostsOfferingExpensesGross" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="ofs_DebtInstrumentCovenantAssetCoveragePercentage" abstract="false" name="DebtInstrumentCovenantAssetCoveragePercentage" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <xs:element id="ofs_LongTermDebtMaturityYearsOneToYearThree" abstract="false" name="LongTermDebtMaturityYearsOneToYearThree" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="ofs_InvestmentCompanyPerShareOperatingPerformanceRollForward" abstract="true" name="InvestmentCompanyPerShareOperatingPerformanceRollForward" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="ofs_InvestmentCompanyGainLossOnExtinguishmentOfDebtPerShare" abstract="false" name="InvestmentCompanyGainLossOnExtinguishmentOfDebtPerShare" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:perShareItemType"/>
  <xs:element id="ofs_InvestmentCompanyRatioAndSupplementalDataAbstract" abstract="true" name="InvestmentCompanyRatioAndSupplementalDataAbstract" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="ofs_InvestmentCompanyExpenseAndGainLossOnExtinguishmentOfDebtRatio" abstract="false" name="InvestmentCompanyExpenseAndGainLossOnExtinguishmentOfDebtRatio" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <xs:element id="ofs_InvestmentCompanyGainLossOnExtinguishmentOfDebtRatio" abstract="false" name="InvestmentCompanyGainLossOnExtinguishmentOfDebtRatio" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <xs:element id="ofs_O2025Q1AggregateDividendsMember" abstract="true" name="O2025Q1AggregateDividendsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="ofs_O2025Q2AggregateDividendsMember" abstract="true" name="O2025Q2AggregateDividendsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="ofs_O2025Q3AggregateDividendsMember" abstract="true" name="O2025Q3AggregateDividendsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="ofs_O2024Q1AggregateDividendsMember" abstract="true" name="O2024Q1AggregateDividendsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="ofs_O2024Q2AggregateDividendsMember" abstract="true" name="O2024Q2AggregateDividendsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="ofs_O2024Q3AggregateDividendsMember" abstract="true" name="O2024Q3AggregateDividendsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="ofs_StockRepurchasedDuringPeriodSharesDividendReinvestmentPlan" abstract="false" name="StockRepurchasedDuringPeriodSharesDividendReinvestmentPlan" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:sharesItemType"/>
  <xs:element id="ofs_StockRepurchasedDuringPeriodAveragePriceDividendReinvestmentPlan" abstract="false" name="StockRepurchasedDuringPeriodAveragePriceDividendReinvestmentPlan" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:perShareItemType"/>
  <xs:element id="ofs_StockRepurchasedDuringPeriodValueDividendReinvestmentPlan" abstract="false" name="StockRepurchasedDuringPeriodValueDividendReinvestmentPlan" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="ofs_UnsecuredNotesMember" abstract="true" name="UnsecuredNotesMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="ofs_Security1CommonMember" abstract="true" name="Security1CommonMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
</xs:schema>
