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        <link:definition>080300 - Disclosure - INVENTORIES (Tables)</link:definition>
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        <link:definition>080500 - Disclosure - PDMCX JOINT VENTURE (Tables)</link:definition>
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        <link:definition>080700 - Disclosure - REVENUE (Tables)</link:definition>
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        <link:definition>080800 - Disclosure - LEASES (Tables)</link:definition>
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        <link:definition>080900 - Disclosure - SHARE-BASED COMPENSATION (Tables)</link:definition>
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        <link:definition>081100 - Disclosure - EARNINGS PER SHARE (Tables)</link:definition>
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        <link:definition>081400 - Disclosure - SHARE REPURCHASE PROGRAMS (Tables)</link:definition>
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        <link:usedOn>link:calculationLink</link:usedOn>
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        <link:definition>090100 - Disclosure - BASIS OF FINANCIAL STATEMENT PRESENTATION (Details)</link:definition>
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        <link:definition>090200 - Disclosure - CASH, CASH EQUIVALENTS AND RESTRICTED CASH (Details)</link:definition>
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        <link:usedOn>link:calculationLink</link:usedOn>
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        <link:definition>090300 - Disclosure - INVENTORIES (Details)</link:definition>
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        <link:definition>090400 - Disclosure - PROPERTY, PLANT AND EQUIPMENT, NET (Details)</link:definition>
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        <link:definition>090500 - Disclosure - PDMCX JOINT VENTURE, VIE (Details)</link:definition>
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        <link:definition>090502 - Disclosure - PDMCX JOINT VENTURE, Carrying Amounts of Assets and Liabilities (Details)</link:definition>
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        <link:definition>090600 - Disclosure - DEBT (Details)</link:definition>
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        <link:definition>090806 - Disclosure - LEASES, Future Lease Payments Under Noncancelable Operating and Finance Leases (Details)1</link:definition>
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  <xs:element name="SupplementalInformationRelatedToOperatingAndFinanceLeasesTableTextBlock" id="plab_SupplementalInformationRelatedToOperatingAndFinanceLeasesTableTextBlock" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:periodType="duration" />
  <xs:element name="LesseeOperatingAndFinanceLeaseWeightedAverageRemainingLeaseTermDiscountRateTableTextBlock" id="plab_LesseeOperatingAndFinanceLeaseWeightedAverageRemainingLeaseTermDiscountRateTableTextBlock" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:periodType="duration" />
  <xs:element name="InformationOnOperatingAndFinanceLeasesIncludedInConsolidatedBalanceSheetsTableTextBlock" id="plab_InformationOnOperatingAndFinanceLeasesIncludedInConsolidatedBalanceSheetsTableTextBlock" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:periodType="duration" />
  <xs:element name="FutureLeasePaymentsUnderNoncancelableOperatingAndFinanceLeasesTableTextBlock" id="plab_FutureLeasePaymentsUnderNoncancelableOperatingAndFinanceLeasesTableTextBlock" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:periodType="duration" />
  <xs:element name="AverageLeaseTermsDiscountRatesAndLeasesNotYetCommencedAbstract" id="plab_AverageLeaseTermsDiscountRatesAndLeasesNotYetCommencedAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" nillable="true" abstract="true" xbrli:periodType="duration" />
  <xs:element name="SupplementalCashFlowInformationRelatedToLeasesAbstract" id="plab_SupplementalCashFlowInformationRelatedToLeasesAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" nillable="true" abstract="true" xbrli:periodType="duration" />
  <xs:element name="LesseeOperatingLeaseLiabilityToBePaidAfterYearFour" id="plab_LesseeOperatingLeaseLiabilityToBePaidAfterYearFour" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:periodType="instant" xbrli:balance="credit" />
  <xs:element name="FinanceLeaseLiabilityPaymentsDueAfterYearFour" id="plab_FinanceLeaseLiabilityPaymentsDueAfterYearFour" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:periodType="instant" xbrli:balance="credit" />
</xs:schema>
