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<!--Copyright 2026 Workiva-->
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  <xs:element id="ck0001540305_FixedIncomeSecuritiesRiskValuationRiskMember" abstract="true" name="FixedIncomeSecuritiesRiskValuationRiskMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
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  <xs:element id="ck0001540305_MortgageAndAssetBackedSecuritiesRiskMember" abstract="true" name="MortgageAndAssetBackedSecuritiesRiskMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
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</xs:schema>
