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  <element id="son_AnticipatedUsagePercentageOfAluminumCoveredBySwapContractYearOne" name="AnticipatedUsagePercentageOfAluminumCoveredBySwapContractYearOne" type="us-types:percentItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" />
  <element id="son_AnnualSalesOfBusinessSold" name="AnnualSalesOfBusinessSold" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" />
</schema>