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  <import namespace="http://fasb.org/us-gaap/2013-01-31" schemaLocation="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd"/>
  <import namespace="http://xbrl.sec.gov/country/2013-01-31" schemaLocation="http://xbrl.sec.gov/country/2013/country-2013-01-31.xsd"/>
  <import namespace="http://xbrl.sec.gov/currency/2012-01-31" schemaLocation="http://xbrl.sec.gov/currency/2012/currency-2012-01-31.xsd"/>
  <import namespace="http://xbrl.sec.gov/dei/2013-01-31" schemaLocation="http://xbrl.sec.gov/dei/2013/dei-2013-01-31.xsd"/>
  <import namespace="http://xbrl.sec.gov/exch/2013-01-31" schemaLocation="http://xbrl.sec.gov/exch/2013/exch-2013-01-31.xsd"/>
  <import namespace="http://xbrl.sec.gov/invest/2013-01-31" schemaLocation="http://xbrl.sec.gov/invest/2013/invest-2013-01-31.xsd"/>
  <import namespace="http://xbrl.sec.gov/stpr/2011-01-31" schemaLocation="http://xbrl.sec.gov/stpr/2011/stpr-2011-01-31.xsd"/>
  <element name="AggregatePurchaseOfEachFund" id="ck0001415311_AggregatePurchaseOfEachFund" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="AgreementsTextBlock" id="ck0001415311_AgreementsTextBlock" type="nonnum:textBlockItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="AustralianDollarFxCurrencyFuturesCmeExpiresJuneTwoThousandAndFourteenMember" id="ck0001415311_AustralianDollarFxCurrencyFuturesCmeExpiresJuneTwoThousandAndFourteenMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="BrokerageCommissionExpense" id="ck0001415311_BrokerageCommissionExpense" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="CalculationOfFundsFinalNetAssetValueForCreationAndRedemptionOfFundSharesTextBlock" id="ck0001415311_CalculationOfFundsFinalNetAssetValueForCreationAndRedemptionOfFundSharesTextBlock" type="nonnum:textBlockItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="CashCollateralPledgedToCoverMarginRequirements" id="ck0001415311_CashCollateralPledgedToCoverMarginRequirements" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="CeilingForFeePaidToAdministrativeAndLegalFacilitators" id="ck0001415311_CeilingForFeePaidToAdministrativeAndLegalFacilitators" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="CeilingForPreparationAndMailingFee" id="ck0001415311_CeilingForPreparationAndMailingFee" type="num:percentItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="ChangeInNetAssetValueFromOperationsPerShare" id="ck0001415311_ChangeInNetAssetValueFromOperationsPerShare" type="num:perShareItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="ChangeInNetUnrealizedAppreciationDepreciation" id="ck0001415311_ChangeInNetUnrealizedAppreciationDepreciation" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="ChangeInUnrealizedAppreciationDepreciationOnDerivativesRecognizedInIncome" id="ck0001415311_ChangeInUnrealizedAppreciationDepreciationOnDerivativesRecognizedInIncome" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="CommitmentToDeliverReceive" id="ck0001415311_CommitmentToDeliverReceive" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="ContractsToPurchaseMember" id="ck0001415311_ContractsToPurchaseMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="ContractsToSellMember" id="ck0001415311_ContractsToSellMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="CreationAndRedemptionOfCreationUnitsLineItems" id="ck0001415311_CreationAndRedemptionOfCreationUnitsLineItems" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="CreationAndRedemptionOfCreationUnitsTable" id="ck0001415311_CreationAndRedemptionOfCreationUnitsTable" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrldt:hypercubeItem"/>
  <element name="CreationAndRedemptionOfCreationUnitsTextBlock" id="ck0001415311_CreationAndRedemptionOfCreationUnitsTextBlock" type="nonnum:textBlockItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="CreationUnitBlockSharesOfFund" id="ck0001415311_CreationUnitBlockSharesOfFund" type="xbrli:sharesItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="CrudeOilNymexExpiresMayTwoThousandAndFourteenMember" id="ck0001415311_CrudeOilNymexExpiresMayTwoThousandAndFourteenMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="DecreaseIncreaseInLimitationBySponsor" id="ck0001415311_DecreaseIncreaseInLimitationBySponsor" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="DecreaseIncreaseInOfferingCosts" id="ck0001415311_DecreaseIncreaseInOfferingCosts" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="DecreaseIncreaseInReceivableOnOpenFuturesContracts" id="ck0001415311_DecreaseIncreaseInReceivableOnOpenFuturesContracts" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="DecreaseIncreaseInSegregatedCashBalancesWithBrokersForFuturesContracts" id="ck0001415311_DecreaseIncreaseInSegregatedCashBalancesWithBrokersForFuturesContracts" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="DerivativeAssetNotDesignatedAsHedgingInstrumentUnrealizedAppreciation" id="ck0001415311_DerivativeAssetNotDesignatedAsHedgingInstrumentUnrealizedAppreciation" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="DerivativeLiabilityNotDesignatedAsHedgingInstrumentUnrealizedDepreciation" id="ck0001415311_DerivativeLiabilityNotDesignatedAsHedgingInstrumentUnrealizedDepreciation" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="DerivativeRateReceivedPaidPercent" id="ck0001415311_DerivativeRateReceivedPaidPercent" type="num:percentItemType" abstract="false" xbrli:periodType="instant" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="DeutscheBankAgMember" id="ck0001415311_DeutscheBankAgMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="DisclosureCreationAndRedemptionOfCreationUnitsAdditionalInformationAbstract" id="ck0001415311_DisclosureCreationAndRedemptionOfCreationUnitsAdditionalInformationAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="DocumentAndEntityInformationAbstract" id="ck0001415311_DocumentAndEntityInformationAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="EuroFxCurrencyFuturesCmeExpiresJuneTwoThousandAndFourteenMember" id="ck0001415311_EuroFxCurrencyFuturesCmeExpiresJuneTwoThousandAndFourteenMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="EuroWithGoldmanSachsInternationalMember" id="ck0001415311_EuroWithGoldmanSachsInternationalMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="EuroWithUbsAgMember" id="ck0001415311_EuroWithUbsAgMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="ExecutionDatePriorToOpeningOfTrading" id="ck0001415311_ExecutionDatePriorToOpeningOfTrading" type="xbrli:stringItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="ExpenseRatioToAverageNetAssets" id="ck0001415311_ExpenseRatioToAverageNetAssets" type="num:percentItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="ExpenseRatioToAverageNetAssetsExcludingBrokerageCommissions" id="ck0001415311_ExpenseRatioToAverageNetAssetsExcludingBrokerageCommissions" type="num:percentItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="FinalNetAssetValueForFiscalPeriodPolicyTextBlock" id="ck0001415311_FinalNetAssetValueForFiscalPeriodPolicyTextBlock" type="nonnum:textBlockItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="FinancialHighlightsLineItems" id="ck0001415311_FinancialHighlightsLineItems" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="FinancialHighlightsTable" id="ck0001415311_FinancialHighlightsTable" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrldt:hypercubeItem"/>
  <element name="FixedTransactionFeePerCreationUnit" id="ck0001415311_FixedTransactionFeePerCreationUnit" type="us-types:perUnitItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="ForwardAgreementsNetUnrealizedGain" id="ck0001415311_ForwardAgreementsNetUnrealizedGain" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="ForwardAgreementsWithDeutscheBankAgBasedOnZeroPointNineNineFiveFineTroyOunceGoldMember" id="ck0001415311_ForwardAgreementsWithDeutscheBankAgBasedOnZeroPointNineNineFiveFineTroyOunceGoldMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="ForwardAgreementsWithDeutscheBankAgBasedOnZeroPointNineNineNineFineTroyOunceSilverMember" id="ck0001415311_ForwardAgreementsWithDeutscheBankAgBasedOnZeroPointNineNineNineFineTroyOunceSilverMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="ForwardAgreementsWithGoldmanSachsInternationalBasedOnZeroPointNineNineFiveFineTroyOunceGoldMember" id="ck0001415311_ForwardAgreementsWithGoldmanSachsInternationalBasedOnZeroPointNineNineFiveFineTroyOunceGoldMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="ForwardAgreementsWithGoldmanSachsInternationalBasedOnZeroPointNineNineNineFineTroyOunceSilverMember" id="ck0001415311_ForwardAgreementsWithGoldmanSachsInternationalBasedOnZeroPointNineNineNineFineTroyOunceSilverMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="ForwardAgreementsWithSocieteGeneraleSaBasedOnZeroPointNineNineFiveFineTroyOunceGoldMember" id="ck0001415311_ForwardAgreementsWithSocieteGeneraleSaBasedOnZeroPointNineNineFiveFineTroyOunceGoldMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="ForwardAgreementsWithSocieteGeneraleSaBasedOnZeroPointNineNineNineFineTroyOunceSilverMember" id="ck0001415311_ForwardAgreementsWithSocieteGeneraleSaBasedOnZeroPointNineNineNineFineTroyOunceSilverMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="ForwardAgreementsWithUbsAgBasedOnZeroPointNineNineFiveFineTroyOunceGoldMember" id="ck0001415311_ForwardAgreementsWithUbsAgBasedOnZeroPointNineNineFiveFineTroyOunceGoldMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="ForwardAgreementsWithUbsAgBasedOnZeroPointNineNineNineFineTroyOunceSilverMember" id="ck0001415311_ForwardAgreementsWithUbsAgBasedOnZeroPointNineNineNineFineTroyOunceSilverMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="ForwardContractsNetRealizedGain" id="ck0001415311_ForwardContractsNetRealizedGain" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="FutureContractsNetRealizedGain" id="ck0001415311_FutureContractsNetRealizedGain" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="FutureContractsNetUnrealizedGains" id="ck0001415311_FutureContractsNetUnrealizedGains" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="GearedVixFundMember" id="ck0001415311_GearedVixFundMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="GoldFuturesComexExpiresJuneTwoThousandAndFourteenMember" id="ck0001415311_GoldFuturesComexExpiresJuneTwoThousandAndFourteenMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="GoldmanSachsCoMember" id="ck0001415311_GoldmanSachsCoMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="GoldmanSachsMember" id="ck0001415311_GoldmanSachsMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="IncreaseDecreaseInManagementFeePayable" id="ck0001415311_IncreaseDecreaseInManagementFeePayable" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="IncreaseDecreaseInPayableForOfferingCosts" id="ck0001415311_IncreaseDecreaseInPayableForOfferingCosts" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="IncreaseDecreaseInPayableOnFuturesContracts" id="ck0001415311_IncreaseDecreaseInPayableOnFuturesContracts" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="InvestmentHoldingsAbstract" id="ck0001415311_InvestmentHoldingsAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="InvestmentTransactionsAndRelatedIncomePolicyTextBlock" id="ck0001415311_InvestmentTransactionsAndRelatedIncomePolicyTextBlock" type="nonnum:textBlockItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="LevelThreePortfolioInvestmentsForSignificantUnobservableInputsFairValue" id="ck0001415311_LevelThreePortfolioInvestmentsForSignificantUnobservableInputsFairValue" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="LeverageFundMember" id="ck0001415311_LeverageFundMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="LocalCurrency" id="ck0001415311_LocalCurrency" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="MarketValuePerShare" id="ck0001415311_MarketValuePerShare" type="num:perShareItemType" abstract="false" xbrli:periodType="instant" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="NaturalGasNymexExpiresMayTwoThousandAndFourteenMember" id="ck0001415311_NaturalGasNymexExpiresMayTwoThousandAndFourteenMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="NetAdditionRedemptionOfShares" id="ck0001415311_NetAdditionRedemptionOfShares" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="NetAdditionRedemptionOfSharesShares" id="ck0001415311_NetAdditionRedemptionOfSharesShares" type="xbrli:sharesItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="NetAssetValueCalculationDate" id="ck0001415311_NetAssetValueCalculationDate" type="xbrli:stringItemType" abstract="false" xbrli:periodType="instant" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="NetAssetValueCalculationTime" id="ck0001415311_NetAssetValueCalculationTime" type="xbrli:stringItemType" abstract="false" xbrli:periodType="instant" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="NetAssetValuePerShare" id="ck0001415311_NetAssetValuePerShare" type="num:perShareItemType" abstract="false" xbrli:periodType="instant" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="NetIncomeLossPerWeightedAverageShare" id="ck0001415311_NetIncomeLossPerWeightedAverageShare" type="num:perShareItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="NetInvestmentIncomeLossPerShare" id="ck0001415311_NetInvestmentIncomeLossPerShare" type="num:perShareItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="NetInvestmentIncomeLossRatioToAverageNetAssets" id="ck0001415311_NetInvestmentIncomeLossRatioToAverageNetAssets" type="num:percentItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="NetRealizedAndUnrealizedGainLossPerShare" id="ck0001415311_NetRealizedAndUnrealizedGainLossPerShare" type="num:perShareItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="NetRealizedGainLossOnForeignCurrencyForwardContractsChangesInUnrealizedAppreciationDepreciationOnForeignCurrencyForwardContractsMember" id="ck0001415311_NetRealizedGainLossOnForeignCurrencyForwardContractsChangesInUnrealizedAppreciationDepreciationOnForeignCurrencyForwardContractsMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="NetRealizedGainLossOnFuturesContractsChangesInUnrealizedAppreciationDepreciationOnFuturesContractsMember" id="ck0001415311_NetRealizedGainLossOnFuturesContractsChangesInUnrealizedAppreciationDepreciationOnFuturesContractsMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="NetRealizedGainLossOnFuturesContractsSwapAndOrForwardAgreementsChangesInUnrealizedAppreciationDepreciationOnFuturesContractsSwapAndOrForwardAgreementsMember" id="ck0001415311_NetRealizedGainLossOnFuturesContractsSwapAndOrForwardAgreementsChangesInUnrealizedAppreciationDepreciationOnFuturesContractsSwapAndOrForwardAgreementsMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="NetRealizedGainLossShortTermUsGovernmentAndAgencyObligations" id="ck0001415311_NetRealizedGainLossShortTermUsGovernmentAndAgencyObligations" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="NetSalePurchaseOfShortTermUSGovernmentAndAgencyObligations" id="ck0001415311_NetSalePurchaseOfShortTermUSGovernmentAndAgencyObligations" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="NewFundMember" id="ck0001415311_NewFundMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="NumberOfContracts" id="ck0001415311_NumberOfContracts" type="xbrli:integerItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="NumberOfDaysForExpectedMultipleReturns" id="ck0001415311_NumberOfDaysForExpectedMultipleReturns" type="xbrli:durationItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="NumberOfSeries" id="ck0001415311_NumberOfSeries" type="xbrli:positiveIntegerItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="NumberOfSharesOfEachFund" id="ck0001415311_NumberOfSharesOfEachFund" type="xbrli:sharesItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="OfferingCostsAmortizationPeriodMonths" id="ck0001415311_OfferingCostsAmortizationPeriodMonths" type="xbrli:durationItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="OfferingCostsTextBlock" id="ck0001415311_OfferingCostsTextBlock" type="nonnum:textBlockItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="OrganizationAndOfferingCostsLineItems" id="ck0001415311_OrganizationAndOfferingCostsLineItems" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="OrganizationAndOfferingCostsTable" id="ck0001415311_OrganizationAndOfferingCostsTable" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrldt:hypercubeItem"/>
  <element name="OrganizationLineItems" id="ck0001415311_OrganizationLineItems" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="OrganizationTable" id="ck0001415311_OrganizationTable" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrldt:hypercubeItem"/>
  <element name="PayableForCapitalSharesRedeemed" id="ck0001415311_PayableForCapitalSharesRedeemed" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="PayableOnOpenFuturesContractsAndUnrealizedDepreciationOnSwapAgreementsMember" id="ck0001415311_PayableOnOpenFuturesContractsAndUnrealizedDepreciationOnSwapAgreementsMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="PayableOnOpenFuturesContractsUnrealizedDepreciationOnSwapAndOrForwardAgreementsMember" id="ck0001415311_PayableOnOpenFuturesContractsUnrealizedDepreciationOnSwapAndOrForwardAgreementsMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
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</schema>