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  <xs:element name="AuthorizedParticipantConcentrationRiskMember" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="ck0001579881_AuthorizedParticipantConcentrationRiskMember"/>   
  <xs:element name="UnderlyingETPRiskMember" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="ck0001579881_UnderlyingETPRiskMember"/> 
  <xs:element name="CapChangeRiskMember" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="ck0001579881_CapChangeRiskMember"/>   
  <xs:element name="CapRiskMember" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="ck0001579881_CapRiskMember"/> 
  <xs:element name="CapitalProtectionRiskMember" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="ck0001579881_CapitalProtectionRiskMember"/>    
  <xs:element name="CappedUpsideRiskMember" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="ck0001579881_CappedUpsideRiskMember"/>    
  <xs:element name="CashHoldingsRiskMember" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="ck0001579881_CashHoldingsRiskMember"/>    
  <xs:element name="ConcentrationRiskMember" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="ck0001579881_ConcentrationRiskMember"/> 
  <xs:element name="ClearingMemberDefaultRiskMember" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="ck0001579881_ClearingMemberDefaultRiskMember"/>  
  <xs:element name="CorrelationRiskMember" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="ck0001579881_CorrelationRiskMember"/>  
  <xs:element name="CostsOfBuyingAndSellingFundSharesMember" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="ck0001579881_CostsOfBuyingAndSellingFundSharesMember"/>   
  <xs:element name="CounterpartyRiskMember" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="ck0001579881_CounterpartyRiskMember"/>    
  <xs:element name="DerivativesRiskMember" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="ck0001579881_DerivativesRiskMember"/>  
  <xs:element name="DigitalAssetsRiskMember" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="ck0001579881_DigitalAssetsRiskMember"/> 
  <xs:element name="RisksAssociatedWithTheIndexMember" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="ck0001579881_RisksAssociatedWithTheIndexMember"/> 
  <xs:element name="EquitySecuritiesRiskMember" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="ck0001579881_EquitySecuritiesRiskMember"/>  
  <xs:element name="FloorRiskMember" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="ck0001579881_FloorRiskMember"/>     
  <xs:element name="FLEXOptionsRiskMember" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="ck0001579881_FLEXOptionsRiskMember"/>  
  <xs:element name="BoxSpreadRiskMember" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="ck0001579881_BoxSpreadRiskMember"/>   
  <xs:element name="InvestmentInASubsidiaryMember" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="ck0001579881_InvestmentInASubsidiaryMember"/>   
  <xs:element name="InvestmentTimingRiskMember" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="ck0001579881_InvestmentTimingRiskMember"/>  
  <xs:element name="LiquidityRiskMember" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="ck0001579881_LiquidityRiskMember"/>   
  <xs:element name="LiquidityRiskFLEXOptionsMember" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="ck0001579881_LiquidityRiskFLEXOptionsMember"/>     
  <xs:element name="LiquidityRiskListedOptionsMember" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="ck0001579881_LiquidityRiskListedOptionsMember"/>    
  <xs:element name="LiquidityRiskOTCOptionsMember" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="ck0001579881_LiquidityRiskOTCOptionsMember"/>   
  <xs:element name="ManagementRiskMember" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="ck0001579881_ManagementRiskMember"/>     
  <xs:element name="MarketMakerRiskMember" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="ck0001579881_MarketMakerRiskMember"/>  
  <xs:element name="MarketRiskMember" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="ck0001579881_MarketRiskMember"/>  
  <xs:element name="NewFundRiskMember" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="ck0001579881_NewFundRiskMember"/>    
  <xs:element name="OptionsRiskMember" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="ck0001579881_OptionsRiskMember"/>    
  <xs:element name="OTCOptionsRiskMember" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="ck0001579881_OTCOptionsRiskMember"/>     
  <xs:element name="PositionLimitsRiskMember" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="ck0001579881_PositionLimitsRiskMember"/>   
  <xs:element name="PremiumDiscountRiskMember" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="ck0001579881_PremiumDiscountRiskMember"/>     
  <xs:element name="SecondaryMarketTradingRiskMember" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="ck0001579881_SecondaryMarketTradingRiskMember"/>    
  <xs:element name="SectorRiskMember" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="ck0001579881_SectorRiskMember"/>  
  <xs:element name="TaxRiskMember" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="ck0001579881_TaxRiskMember"/> 
  <xs:element name="TradingIssuesRiskMember" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="ck0001579881_TradingIssuesRiskMember"/> 
  <xs:element name="USGovernmentSecurityRiskMember" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="ck0001579881_USGovernmentSecurityRiskMember"/>     
  <xs:element name="USTreasuryRiskMember" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="ck0001579881_USTreasuryRiskMember"/>     
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  <xs:element name="ValuationRiskMember" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="ck0001579881_ValuationRiskMember"/>   
</xs:schema>
