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  <element name="RiskOfLeveragedLoanMarketPriceDeclineMember" id="ck0001678124_RiskOfLeveragedLoanMarketPriceDeclineMember" type="dtr-types:domainItemType" abstract="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" nillable="true"/>
  <element name="RisksAssociatedWithCommodityFuturesTradingCommissionRegulationMember" id="ck0001678124_RisksAssociatedWithCommodityFuturesTradingCommissionRegulationMember" type="dtr-types:domainItemType" abstract="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" nillable="true"/>
  <element name="RisksAssociatedWithFundDistributionPolicyMember" id="ck0001678124_RisksAssociatedWithFundDistributionPolicyMember" type="dtr-types:domainItemType" abstract="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" nillable="true"/>
  <element name="RisksAssociatedWithInvestmentsInEquitySecuritiesIncidentalToInvestmentsInSyndicatedLoansMember" id="ck0001678124_RisksAssociatedWithInvestmentsInEquitySecuritiesIncidentalToInvestmentsInSyndicatedLoansMember" type="dtr-types:domainItemType" abstract="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" nillable="true"/>
  <element name="RisksRelatingToFundsRegulatedInvestmentCompanyStatusMember" id="ck0001678124_RisksRelatingToFundsRegulatedInvestmentCompanyStatusMember" type="dtr-types:domainItemType" abstract="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" nillable="true"/>
  <element name="SecuredBorrowingsMember" id="ck0001678124_SecuredBorrowingsMember" type="dtr-types:domainItemType" abstract="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" nillable="true"/>
  <element name="SeniorManagementPersonnelOfAdvisorsMember" id="ck0001678124_SeniorManagementPersonnelOfAdvisorsMember" type="dtr-types:domainItemType" abstract="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" nillable="true"/>
  <element name="SeriesAMandatoryRedeemablePreferredSharesMember" id="ck0001678124_SeriesAMandatoryRedeemablePreferredSharesMember" type="dtr-types:domainItemType" abstract="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" nillable="true"/>
  <element name="SeriesBMandatoryRedeemablePreferredSharesMember" id="ck0001678124_SeriesBMandatoryRedeemablePreferredSharesMember" type="dtr-types:domainItemType" abstract="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" nillable="true"/>
  <element name="SeriesCMandatoryRedeemablePreferredSharesMember" id="ck0001678124_SeriesCMandatoryRedeemablePreferredSharesMember" type="dtr-types:domainItemType" abstract="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" nillable="true"/>
  <element name="SeriesDMandatoryRedeemablePreferredSharesMember" id="ck0001678124_SeriesDMandatoryRedeemablePreferredSharesMember" type="dtr-types:domainItemType" abstract="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" nillable="true"/>
  <element name="SeriesEMandatoryRedeemablePreferredSharesMember" id="ck0001678124_SeriesEMandatoryRedeemablePreferredSharesMember" type="dtr-types:domainItemType" abstract="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" nillable="true"/>
  <element name="SeriesFMandatoryRedeemablePreferredSharesMember" id="ck0001678124_SeriesFMandatoryRedeemablePreferredSharesMember" type="dtr-types:domainItemType" abstract="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" nillable="true"/>
  <element name="SeriesGMandatoryRedeemablePreferredSharesMember" id="ck0001678124_SeriesGMandatoryRedeemablePreferredSharesMember" type="dtr-types:domainItemType" abstract="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" nillable="true"/>
  <element name="SeriesHMandatoryRedeemablePreferredSharesMember" id="ck0001678124_SeriesHMandatoryRedeemablePreferredSharesMember" type="dtr-types:domainItemType" abstract="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" nillable="true"/>
  <element name="SeriesIMandatoryRedeemablePreferredSharesMember" id="ck0001678124_SeriesIMandatoryRedeemablePreferredSharesMember" type="dtr-types:domainItemType" abstract="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" nillable="true"/>
  <element name="SeriesJMandatoryRedeemablePreferredSharesMember" id="ck0001678124_SeriesJMandatoryRedeemablePreferredSharesMember" type="dtr-types:domainItemType" abstract="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" nillable="true"/>
  <element name="SeriesKMandatoryRedeemablePreferredSharesMember" id="ck0001678124_SeriesKMandatoryRedeemablePreferredSharesMember" type="dtr-types:domainItemType" abstract="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" nillable="true"/>
  <element name="SeriesLMandatoryRedeemablePreferredSharesMember" id="ck0001678124_SeriesLMandatoryRedeemablePreferredSharesMember" type="dtr-types:domainItemType" abstract="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" nillable="true"/>
  <element name="SharesNotListedNoMarketForSharesMember" id="ck0001678124_SharesNotListedNoMarketForSharesMember" type="dtr-types:domainItemType" abstract="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" nillable="true"/>
  <element name="ShortSalesRiskMember" id="ck0001678124_ShortSalesRiskMember" type="dtr-types:domainItemType" abstract="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" nillable="true"/>
  <element name="SmallCapAndMidCapRiskMember" id="ck0001678124_SmallCapAndMidCapRiskMember" type="dtr-types:domainItemType" abstract="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" nillable="true"/>
  <element name="SourcingOfSuitableAssetsRiskMember" id="ck0001678124_SourcingOfSuitableAssetsRiskMember" type="dtr-types:domainItemType" abstract="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" nillable="true"/>
  <element name="StateStreetCreditFacilityMember" id="ck0001678124_StateStreetCreditFacilityMember" type="dtr-types:domainItemType" abstract="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" nillable="true"/>
  <element name="StateStreetCreditFacilityRiskMember" id="ck0001678124_StateStreetCreditFacilityRiskMember" type="dtr-types:domainItemType" abstract="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" nillable="true"/>
  <element name="SubordinatedLoansRiskMember" id="ck0001678124_SubordinatedLoansRiskMember" type="dtr-types:domainItemType" abstract="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" nillable="true"/>
  <element name="SwapAgreementsRiskMember" id="ck0001678124_SwapAgreementsRiskMember" type="dtr-types:domainItemType" abstract="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" nillable="true"/>
  <element name="SwaptionsRiskMember" id="ck0001678124_SwaptionsRiskMember" type="dtr-types:domainItemType" abstract="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" nillable="true"/>
  <element name="SyndicatedLoansRiskMember" id="ck0001678124_SyndicatedLoansRiskMember" type="dtr-types:domainItemType" abstract="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" nillable="true"/>
  <element name="TariffRiskMember" id="ck0001678124_TariffRiskMember" type="dtr-types:domainItemType" abstract="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" nillable="true"/>
  <element name="TechnologyAndArtificialIntelligenceRiskMember" id="ck0001678124_TechnologyAndArtificialIntelligenceRiskMember" type="dtr-types:domainItemType" abstract="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" nillable="true"/>
  <element name="UncertainExitStrategiesMember" id="ck0001678124_UncertainExitStrategiesMember" type="dtr-types:domainItemType" abstract="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" nillable="true"/>
  <element name="UncertainTaxTreatmentMember" id="ck0001678124_UncertainTaxTreatmentMember" type="dtr-types:domainItemType" abstract="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" nillable="true"/>
  <element name="UnitedStatesCreditRatingAndEuropeanEconomicCrisisRiskMember" id="ck0001678124_UnitedStatesCreditRatingAndEuropeanEconomicCrisisRiskMember" type="dtr-types:domainItemType" abstract="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" nillable="true"/>
  <element name="UnitedStatesCreditRatingRiskMember" id="ck0001678124_UnitedStatesCreditRatingRiskMember" type="dtr-types:domainItemType" abstract="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" nillable="true"/>
  <element name="UnitedStatesGovernmentDebtSecuritiesRiskMember" id="ck0001678124_UnitedStatesGovernmentDebtSecuritiesRiskMember" type="dtr-types:domainItemType" abstract="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" nillable="true"/>
  <element name="ValuationRiskMember" id="ck0001678124_ValuationRiskMember" type="dtr-types:domainItemType" abstract="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" nillable="true"/>
  <element name="WarrantsRiskMember" id="ck0001678124_WarrantsRiskMember" type="dtr-types:domainItemType" abstract="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" nillable="true"/>
  <element name="WellsCreditFacilityMember" id="ck0001678124_WellsCreditFacilityMember" type="dtr-types:domainItemType" abstract="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" nillable="true"/>
  <element name="WellsCreditFacilityRiskMember" id="ck0001678124_WellsCreditFacilityRiskMember" type="dtr-types:domainItemType" abstract="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" nillable="true"/>
  <element name="WhenIssuedSecuritiesAndForwardCommitmentsMember" id="ck0001678124_WhenIssuedSecuritiesAndForwardCommitmentsMember" type="dtr-types:domainItemType" abstract="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" nillable="true"/>
</schema>
