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  <element id="son_AnticipatedUsagePercentageOfAluminumCoveredBySwapContractFirstSucceedingFiscalYear" name="AnticipatedUsagePercentageOfAluminumCoveredBySwapContractFirstSucceedingFiscalYear" nillable="true" type="num:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="son_CurrentPeriodOtherGrantsMember" name="CurrentPeriodOtherGrantsMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="son_CurrentPeriodGrantsMember" name="CurrentPeriodGrantsMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <element id="son_ProjectedDefinedBenefitPlanAmortizationOfGainsLosses" name="ProjectedDefinedBenefitPlanAmortizationOfGainsLosses" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="credit" />
  <element id="son_ProjectedDefinedBenefitPlanAmortizationOfPriorServiceCostCredit" name="ProjectedDefinedBenefitPlanAmortizationOfPriorServiceCostCredit" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="debit" />
  <element id="son_ProjectedDefinedBenefitPlanAmortizationOfTransitionObligationsAssets" name="ProjectedDefinedBenefitPlanAmortizationOfTransitionObligationsAssets" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="debit" />
</schema>