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  <xs:element id="pmec_CostOfRevenueNetOfGovernmentSubsidies" name="CostOfRevenueNetOfGovernmentSubsidies" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit" />
  <xs:element id="pmec_IncomeTaxesDetailsTable" name="IncomeTaxesDetailsTable" type="xbrli:stringItemType" substitutionGroup="xbrldt:hypercubeItem" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xs:element id="pmec_RoboticMember" name="RoboticMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xs:element id="pmec_FacilitiesServicesMember" name="FacilitiesServicesMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xs:element id="pmec_EmployeeOfSubsidiariesMember" name="EmployeeOfSubsidiariesMember" type="dtr:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xs:element id="pmec_DerecognitionOfSubsidiary" name="DerecognitionOfSubsidiary" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit" />
  <xs:element id="pmec_DeferredTaxLiabilitiesBasisDifferencesOfCustomerRelationshipsFromAcquisitions" name="DeferredTaxLiabilitiesBasisDifferencesOfCustomerRelationshipsFromAcquisitions" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="credit" />
  <xs:element id="pmec_InterestAccruedForConvertibleBonds" name="InterestAccruedForConvertibleBonds" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit" />
  <xs:element id="pmec_OtherOperatingIncomeExpensesNet" name="OtherOperatingIncomeExpensesNet" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="credit" />
  <xs:element id="pmec_IncreaseDecreaseinGovernmentSubsidiesReceivables" name="IncreaseDecreaseinGovernmentSubsidiesReceivables" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit" />
  <xs:element id="pmec_CPNMember" name="CPNMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xs:element id="pmec_LeaseLiabilitiesCurrent" name="LeaseLiabilitiesCurrent" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="credit" />
  <xs:element id="pmec_LeaseLiabilitiesNonCurrent" name="LeaseLiabilitiesNonCurrent" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="credit" />
  <xs:element id="pmec_RecognitionOfRightOfUseAssetsAndLiabilities" name="RecognitionOfRightOfUseAssetsAndLiabilities" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="credit" />
</xs:schema>
