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  <element name="TransactionFeesAndExpenses" id="ck0000790528_TransactionFeesAndExpenses" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="TwentySeventeenAndTwentyEighteenNotesMember" id="ck0000790528_TwentySeventeenAndTwentyEighteenNotesMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="TwoThousandAndSeventeenSeniorNotesMember" id="ck0000790528_TwoThousandAndSeventeenSeniorNotesMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="TwoThousandEighteenSeniorNotesMember" id="ck0000790528_TwoThousandEighteenSeniorNotesMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="UsSubsidiariesMember" id="ck0000790528_UsSubsidiariesMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
</schema>


