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  <xs:element name="C000209628Member" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="ck0000826644_C000209628Member"/>  
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  <xs:element name="C000188882Member" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="ck0000826644_C000188882Member"/>  
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  <xs:element name="C000209634Member" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="ck0000826644_C000209634Member"/>  
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  <xs:element name="C000209632Member" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="ck0000826644_C000209632Member"/>  
  <xs:element name="C000209631Member" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="ck0000826644_C000209631Member"/>  
  <xs:element name="C000107688Member" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="ck0000826644_C000107688Member"/>  
  <xs:element name="C000107689Member" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="ck0000826644_C000107689Member"/>  
  <xs:element name="C000107690Member" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="ck0000826644_C000107690Member"/>  
  <xs:element name="C000107691Member" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="ck0000826644_C000107691Member"/>  
  <xs:element name="C000107692Member" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="ck0000826644_C000107692Member"/>  
  <xs:element name="C000120706Member" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="ck0000826644_C000120706Member"/>  
  <xs:element name="C000209558Member" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="ck0000826644_C000209558Member"/>  
  <xs:element name="C000209557Member" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="ck0000826644_C000209557Member"/>  
  <xs:element name="C000209556Member" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="ck0000826644_C000209556Member"/>  
  <xs:element name="C000209555Member" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="ck0000826644_C000209555Member"/>  
  <xs:element name="C000209554Member" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="ck0000826644_C000209554Member"/>  
  <xs:element name="C000209553Member" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="ck0000826644_C000209553Member"/>  
  <xs:element name="MarketRiskMember" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="ck0000826644_MarketRiskMember"/>  
  <xs:element name="HealthCareSectorRiskMember" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="ck0000826644_HealthCareSectorRiskMember"/>  
  <xs:element name="CorrelationRiskMember" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="ck0000826644_CorrelationRiskMember"/>  
  <xs:element name="SectorFocusRiskMember" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="ck0000826644_SectorFocusRiskMember"/>  
  <xs:element name="IssuerFocusRiskMember" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="ck0000826644_IssuerFocusRiskMember"/>  
  <xs:element name="InvestingInThePrivateFundRiskMember" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="ck0000826644_InvestingInThePrivateFundRiskMember"/>     
  <xs:element name="PreferredSecuritiesRiskMember" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="ck0000826644_PreferredSecuritiesRiskMember"/>   
  <xs:element name="ConvertibleSecuritiesRiskMember" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="ck0000826644_ConvertibleSecuritiesRiskMember"/>  
  <xs:element name="RightsAndWarrantsRiskMember" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="ck0000826644_RightsAndWarrantsRiskMember"/>    
  <xs:element name="DepositaryReceiptsRiskMember" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="ck0000826644_DepositaryReceiptsRiskMember"/> 
  <xs:element name="LimitedPartnerRiskMember" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="ck0000826644_LimitedPartnerRiskMember"/>   
  <xs:element name="EquitySecuritiesRiskMember" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="ck0000826644_EquitySecuritiesRiskMember"/>  
  <xs:element name="DerivativesRiskMember" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="ck0000826644_DerivativesRiskMember"/>  
  <xs:element name="WhenIssuedDelayedDeliveryAndForwardCommitmentRisksMember" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="ck0000826644_WhenIssuedDelayedDeliveryAndForwardCommitmentRisksMember"/>  
  <xs:element name="TBATransactionsRiskMember" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="ck0000826644_TBATransactionsRiskMember"/>     
  <xs:element name="DollarRollTransactionsRiskMember" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="ck0000826644_DollarRollTransactionsRiskMember"/>    
  <xs:element name="LiquidityRiskMember" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="ck0000826644_LiquidityRiskMember"/>   
  <xs:element name="GeneralPartnerRiskMember" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="ck0000826644_GeneralPartnerRiskMember"/>   
  <xs:element name="MLPTaxRiskMember" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="ck0000826644_MLPTaxRiskMember"/>  
  <xs:element name="IndexingRiskMember" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="ck0000826644_IndexingRiskMember"/> 
  <xs:element name="NonCorrelationRiskMember" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="ck0000826644_NonCorrelationRiskMember"/>   
  <xs:element name="SamplingRiskMember" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="ck0000826644_SamplingRiskMember"/> 
  <xs:element name="ActiveTradingRiskMember" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="ck0000826644_ActiveTradingRiskMember"/> 
  <xs:element name="InvestingInStocksRiskMember" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="ck0000826644_InvestingInStocksRiskMember"/>    
  <xs:element name="DebtSecuritiesRiskMember" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="ck0000826644_DebtSecuritiesRiskMember"/>   
  <xs:element name="UnratedSecuritiesRiskMember" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="ck0000826644_UnratedSecuritiesRiskMember"/>    
  <xs:element name="CommodityRiskMember" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="ck0000826644_CommodityRiskMember"/>   
  <xs:element name="CommoditiesTaxRiskMember" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="ck0000826644_CommoditiesTaxRiskMember"/>   
  <xs:element name="ChangingFixedIncomeMarketConditionsRiskMember" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="ck0000826644_ChangingFixedIncomeMarketConditionsRiskMember"/>     
  <xs:element name="HighYieldDebtSecuritiesJunkBondRiskMember" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="ck0000826644_HighYieldDebtSecuritiesJunkBondRiskMember"/>  
  <xs:element name="DefaultedSecuritiesRiskMember" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="ck0000826644_DefaultedSecuritiesRiskMember"/>   
  <xs:element name="CreditLinkedNotesRiskMember" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="ck0000826644_CreditLinkedNotesRiskMember"/>    
  <xs:element name="BankLoanRiskMember" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="ck0000826644_BankLoanRiskMember"/> 
  <xs:element name="DividendRiskMember" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="ck0000826644_DividendRiskMember"/> 
  <xs:element name="ESGConsiderationsRiskMember" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="ck0000826644_ESGConsiderationsRiskMember"/>    
  <xs:element name="NonDiversificationRiskMember" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="ck0000826644_NonDiversificationRiskMember"/> 
  <xs:element name="ForeignInvestmentRiskMember" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="ck0000826644_ForeignInvestmentRiskMember"/>    
  <xs:element name="EmergingMarketsInvestmentRiskMember" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="ck0000826644_EmergingMarketsInvestmentRiskMember"/>     
  <xs:element name="EuropeanInvestmentRiskMember" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="ck0000826644_EuropeanInvestmentRiskMember"/> 
  <xs:element name="GeographicFocusRiskMember" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="ck0000826644_GeographicFocusRiskMember"/>     
  <xs:element name="AsiaPacificRegionRiskexChinaMember" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="ck0000826644_AsiaPacificRegionRiskexChinaMember"/>   
  <xs:element name="AsiaPacificRegionRiskexJapanMember" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="ck0000826644_AsiaPacificRegionRiskexJapanMember"/>   
  <xs:element name="GrowthInvestingRiskMember" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="ck0000826644_GrowthInvestingRiskMember"/>     
  <xs:element name="ValueInvestingRiskMember" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="ck0000826644_ValueInvestingRiskMember"/>   
  <xs:element name="SmallAndMidCapitalizationCompaniesRiskMember" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="ck0000826644_SmallAndMidCapitalizationCompaniesRiskMember"/>   
  <xs:element name="InvestmentCompaniesRiskMember" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="ck0000826644_InvestmentCompaniesRiskMember"/>   
  <xs:element name="FinancialsSectorRiskMember" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="ck0000826644_FinancialsSectorRiskMember"/>  
  <xs:element name="ForeignGovernmentDebtRiskMember" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="ck0000826644_ForeignGovernmentDebtRiskMember"/>  
  <xs:element name="ForeignCurrencyTaxRiskMember" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="ck0000826644_ForeignCurrencyTaxRiskMember"/> 
  <xs:element name="AlternativeInvestmentStrategiesRiskMember" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="ck0000826644_AlternativeInvestmentStrategiesRiskMember"/>  
  <xs:element name="CommodityLinkedNotesRiskMember" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="ck0000826644_CommodityLinkedNotesRiskMember"/>     
  <xs:element name="ShortPositionRiskMember" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="ck0000826644_ShortPositionRiskMember"/> 
  <xs:element name="ExchangeTradedFundsRiskMember" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="ck0000826644_ExchangeTradedFundsRiskMember"/>   
  <xs:element name="AssetAllocationRiskMember" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="ck0000826644_AssetAllocationRiskMember"/>     
  <xs:element name="AffiliatedPortfolioRiskMember" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="ck0000826644_AffiliatedPortfolioRiskMember"/>   
  <xs:element name="ExchangeTradedNotesRiskMember" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="ck0000826644_ExchangeTradedNotesRiskMember"/>   
  <xs:element name="FactorBasedStrategyRiskMember" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="ck0000826644_FactorBasedStrategyRiskMember"/>   
  <xs:element name="QuantitativeModelsRiskMember" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="ck0000826644_QuantitativeModelsRiskMember"/> 
  <xs:element name="VolatilityRiskMember" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="ck0000826644_VolatilityRiskMember"/>     
  <xs:element name="Rule144ASecuritiesAndOtherExemptSecuritiesRiskMember" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="ck0000826644_Rule144ASecuritiesAndOtherExemptSecuritiesRiskMember"/>    
  <xs:element name="EquityLinkedNotesRiskMember" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="ck0000826644_EquityLinkedNotesRiskMember"/>    
  <xs:element name="EventLinkedSecuritiesRiskMember" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="ck0000826644_EventLinkedSecuritiesRiskMember"/>  
  <xs:element name="RestrictedSecuritiesRiskMember" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="ck0000826644_RestrictedSecuritiesRiskMember"/>     
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