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  <xs:element id="oha_ValuationTechniquePrecedentTransactionMember" abstract="true" name="ValuationTechniquePrecedentTransactionMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="oha_MeasurementInputComparativeYieldsMember" abstract="true" name="MeasurementInputComparativeYieldsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="oha_JPMCreditFacilityMember" abstract="true" name="JPMCreditFacilityMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="oha_BNPCreditFacilityMember" abstract="true" name="BNPCreditFacilityMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="oha_A2024ASeniorNotesMember" abstract="true" name="A2024ASeniorNotesMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="oha_CIBCCreditFacilityMember" abstract="true" name="CIBCCreditFacilityMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="oha_CommitmentFeeAxis" abstract="true" name="CommitmentFeeAxis" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrldt:dimensionItem" type="xbrli:stringItemType"/>
  <xs:element id="oha_CommitmentFeeDomain" abstract="true" name="CommitmentFeeDomain" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="oha_CommitmentFeeThreshold1Member" abstract="true" name="CommitmentFeeThreshold1Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="oha_CommitmentFeeThreshold2Member" abstract="true" name="CommitmentFeeThreshold2Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="oha_CommitmentFeeThreshold3Member" abstract="true" name="CommitmentFeeThreshold3Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="oha_CommitmentFeeThreshold4Member" abstract="true" name="CommitmentFeeThreshold4Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="oha_CommitmentFeeThreshold5Member" abstract="true" name="CommitmentFeeThreshold5Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="oha_CommitmentFeeThreshold6Member" abstract="true" name="CommitmentFeeThreshold6Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="oha_CommitmentFeeThreshold7Member" abstract="true" name="CommitmentFeeThreshold7Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="oha_CommitmentFeeThreshold8Member" abstract="true" name="CommitmentFeeThreshold8Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="oha_SterlingOvernightIndexAverageRateSONIAMember" abstract="true" name="SterlingOvernightIndexAverageRateSONIAMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="oha_CanadianOvernightRepoRateAverageCORRAMember" abstract="true" name="CanadianOvernightRepoRateAverageCORRAMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="oha_EuroInterbankOfferedRateEURIBORMember" abstract="true" name="EuroInterbankOfferedRateEURIBORMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="oha_LineOfCreditFacilityMaximumBorrowingCapacityIncludingAccordionFeatureIncreaseLimit" abstract="false" name="LineOfCreditFacilityMaximumBorrowingCapacityIncludingAccordionFeatureIncreaseLimit" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="oha_DebtInstrumentTermOutPeriod" abstract="false" name="DebtInstrumentTermOutPeriod" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:durationItemType"/>
  <xs:element id="oha_DebtInstrumentMaturityNoticePeriod" abstract="false" name="DebtInstrumentMaturityNoticePeriod" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:durationItemType"/>
  <xs:element id="oha_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentageOfFaceAmount" abstract="false" name="LineOfCreditFacilityUnusedCapacityCommitmentFeePercentageOfFaceAmount" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:pureItemType"/>
  <xs:element id="oha_DebtInstrumentCovenantNetWorthAmountMinimum" abstract="false" name="DebtInstrumentCovenantNetWorthAmountMinimum" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="oha_DebtInstrumentCovenantAssetCoverageRatioMinimum" abstract="false" name="DebtInstrumentCovenantAssetCoverageRatioMinimum" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:pureItemType"/>
  <xs:element id="oha_LineOfCreditFacilityUnusedCapacityCommitmentFeeUtilizationRate" abstract="false" name="LineOfCreditFacilityUnusedCapacityCommitmentFeeUtilizationRate" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:pureItemType"/>
  <xs:element id="oha_DebtInstrumentFairValueHedgeCumulativeIncreaseDecrease" abstract="false" name="DebtInstrumentFairValueHedgeCumulativeIncreaseDecrease" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="oha_DerivativeAverageNotionalAmount" abstract="false" name="DerivativeAverageNotionalAmount" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="oha_DebtInstrumentFairValueHedgeIncreaseDecreaseDuringPeriod" abstract="false" name="DebtInstrumentFairValueHedgeIncreaseDecreaseDuringPeriod" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="oha_O2026M1AggregateDividendsMember" abstract="true" name="O2026M1AggregateDividendsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="oha_O2026M2AggregateDividendsMember" abstract="true" name="O2026M2AggregateDividendsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="oha_O2026M3AggregateDividendsMember" abstract="true" name="O2026M3AggregateDividendsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="oha_InvestmentCompanyExpenseOffsetArrangementRepaymentPeriod" abstract="false" name="InvestmentCompanyExpenseOffsetArrangementRepaymentPeriod" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:durationItemType"/>
  <xs:element id="oha_ShareRepurchaseProgramAuthorizedQuarterlyPercentageOfSharesOutstanding" abstract="false" name="ShareRepurchaseProgramAuthorizedQuarterlyPercentageOfSharesOutstanding" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <xs:element id="oha_ShareRepurchaseProgramThresholdPeriodForSharesOutstandingToBePricedAtNetAssetValue" abstract="false" name="ShareRepurchaseProgramThresholdPeriodForSharesOutstandingToBePricedAtNetAssetValue" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:durationItemType"/>
  <xs:element id="oha_ShareRepurchaseProgramPercentageOfNetAssetValueRepresentingPricePerShareOfSharesOutstandingLessThanOneYear" abstract="false" name="ShareRepurchaseProgramPercentageOfNetAssetValueRepresentingPricePerShareOfSharesOutstandingLessThanOneYear" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <xs:element id="oha_CommonStockDividendsPerShareDeclaredOrdinary" abstract="false" name="CommonStockDividendsPerShareDeclaredOrdinary" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:perShareItemType"/>
  <xs:element id="oha_CommonStockDividendsPerShareDeclaredSupplemental" abstract="false" name="CommonStockDividendsPerShareDeclaredSupplemental" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:perShareItemType"/>
  <xs:element id="oha_InvestmentCompanyDistributableEarningsAccumulatedNetInvestmentIncomeLossMember" abstract="true" name="InvestmentCompanyDistributableEarningsAccumulatedNetInvestmentIncomeLossMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="oha_InvestmentCompanyDistributableEarningsAccumulatedNetRealizedGainLossMember" abstract="true" name="InvestmentCompanyDistributableEarningsAccumulatedNetRealizedGainLossMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="oha_InvestmentCompanyDistributableEarningsNetUnrealizedAppreciationDepreciationMember" abstract="true" name="InvestmentCompanyDistributableEarningsNetUnrealizedAppreciationDepreciationMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="oha_UnrealizedGainLossOnDebtAndEquitySecuritiesAfterTax" abstract="false" name="UnrealizedGainLossOnDebtAndEquitySecuritiesAfterTax" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="oha_UnrealizedGainLossOnDerivativesAndForeignCurrencyTransactionAfterTax" abstract="false" name="UnrealizedGainLossOnDerivativesAndForeignCurrencyTransactionAfterTax" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="oha_O2025M1AggregateDividendsMember" abstract="true" name="O2025M1AggregateDividendsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="oha_O2025M2AggregateDividendsMember" abstract="true" name="O2025M2AggregateDividendsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="oha_O2025M3AggregateDividendsMember" abstract="true" name="O2025M3AggregateDividendsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="oha_CommonStockDividendsPerShareDeclaredSpecial" abstract="false" name="CommonStockDividendsPerShareDeclaredSpecial" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:perShareItemType"/>
  <xs:element id="oha_InvestmentCompanyCapitalGainDistributionsPerShare" abstract="false" name="InvestmentCompanyCapitalGainDistributionsPerShare" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:perShareItemType"/>
  <xs:element id="oha_InvestmentCompanyDistributionToShareholdersOrdinaryIncomePerShare" abstract="false" name="InvestmentCompanyDistributionToShareholdersOrdinaryIncomePerShare" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:perShareItemType"/>
  <xs:element id="oha_InvestmentCompanyDistributionToShareholdersCapitalGainNetPerShare" abstract="false" name="InvestmentCompanyDistributionToShareholdersCapitalGainNetPerShare" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:perShareItemType"/>
  <xs:element id="oha_InvestmentCompanyDistributionCapitalGainNet" abstract="false" name="InvestmentCompanyDistributionCapitalGainNet" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="oha_ShareRepurchaseProgramPercentageOfOutstandingSharesRepurchased" abstract="false" name="ShareRepurchaseProgramPercentageOfOutstandingSharesRepurchased" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <xs:element id="oha_InvestmentCompanyNetAssetValuePerSharePeriodIncreaseDecreaseIncludingAdjustments" abstract="false" name="InvestmentCompanyNetAssetValuePerSharePeriodIncreaseDecreaseIncludingAdjustments" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:perShareItemType"/>
  <xs:element id="oha_CommonClassIClassSAndClassDStockIssuanceMember" abstract="true" name="CommonClassIClassSAndClassDStockIssuanceMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="oha_PercentageOfCommonStockOutstandingPurchaseOffering" abstract="false" name="PercentageOfCommonStockOutstandingPurchaseOffering" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
</xs:schema>
