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  <xs:element name="C000042379Member" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="ck0001380175_C000042379Member"/>  
  <xs:element name="C000042380Member" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="ck0001380175_C000042380Member"/>  
  <xs:element name="C000077951Member" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="ck0001380175_C000077951Member"/>  
  <xs:element name="C000135734Member" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="ck0001380175_C000135734Member"/>  
  <xs:element name="C000135735Member" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="ck0001380175_C000135735Member"/>  
  <xs:element name="C000135736Member" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="ck0001380175_C000135736Member"/>  
  <xs:element name="C000148403Member" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="ck0001380175_C000148403Member"/>  
  <xs:element name="C000164839Member" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="ck0001380175_C000164839Member"/>  
  <xs:element name="C000179956Member" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="ck0001380175_C000179956Member"/>  
  <xs:element name="C000189459Member" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="ck0001380175_C000189459Member"/>  
  <xs:element name="C000042375Member" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="ck0001380175_C000042375Member"/>  
</xs:schema>
