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  <xsd:element name="AcquisitionRelatedCostsAndFairValueAdjustmentsToInitialPurchasePriceAllocation" id="mg_AcquisitionRelatedCostsAndFairValueAdjustmentsToInitialPurchasePriceAllocation" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element name="LegalReserve" id="mg_LegalReserve" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element name="InterestExpenseAndAmortizationOfDeferredCharges" id="mg_InterestExpenseAndAmortizationOfDeferredCharges" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element name="IncreaseDecreaseInOtherAccruedLiabilitiesAndDeferredLiabilities" id="mg_IncreaseDecreaseInOtherAccruedLiabilitiesAndDeferredLiabilities" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element name="PaymentsToAcquireIntangibleAssetsAndSoftware" id="mg_PaymentsToAcquireIntangibleAssetsAndSoftware" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element name="SignificantAccountingPoliciesAndRecentAccountingPronouncementsTextBlock" id="mg_SignificantAccountingPoliciesAndRecentAccountingPronouncementsTextBlock" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ScheduleOfAccruedLiabilitiesDeferredRevenueAndContingentConsiderationLiabilitiesCurrentTableTextBlock" id="mg_ScheduleOfAccruedLiabilitiesDeferredRevenueAndContingentConsiderationLiabilitiesCurrentTableTextBlock" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="BPPlcMember" id="mg_BPPlcMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ConcentrationRiskNumberOfCustomers" id="mg_ConcentrationRiskNumberOfCustomers" type="xbrli:integerItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="StockIssuedDuringPeriodSharesNewIssuesExcludingSharesIssuedBySellingStockholder" id="mg_StockIssuedDuringPeriodSharesNewIssuesExcludingSharesIssuedBySellingStockholder" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="StockIssuedDuringPeriodSharesNewIssuesSharesIssuedBySellingStockholder" id="mg_StockIssuedDuringPeriodSharesNewIssuesSharesIssuedBySellingStockholder" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="CommonStockNumberOfVotesPerShare" id="mg_CommonStockNumberOfVotesPerShare" type="xbrli:integerItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="LongTermIncentivePlan2009Member" id="mg_LongTermIncentivePlan2009Member" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="IncentiveStockOptionsMember" id="mg_IncentiveStockOptionsMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="NonqualifiedStockOptionsMember" id="mg_NonqualifiedStockOptionsMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExpirationTerm" id="mg_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExpirationTerm" type="xbrli:durationItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfPlansPriorToIPO" id="mg_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfPlansPriorToIPO" type="xbrli:integerItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="IncrementalCommonSharesAttributableToStockOptionsOutstanding" id="mg_IncrementalCommonSharesAttributableToStockOptionsOutstanding" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="IncrementalCommonSharesAttributableToRestrictedStockUnitsOutstanding" id="mg_IncrementalCommonSharesAttributableToRestrictedStockUnitsOutstanding" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="OfficeFurnitureAndEquipmentMember" id="mg_OfficeFurnitureAndEquipmentMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="AccruedSalariesWagesAndEmployeeRelatedBenefitsCurrent" id="mg_AccruedSalariesWagesAndEmployeeRelatedBenefitsCurrent" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element name="AccruedWorkersCompensationAndHealthBenefitsCurrent" id="mg_AccruedWorkersCompensationAndHealthBenefitsCurrent" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element name="LawsuitsForAllegedViolationOfCaliforniaLaborAndEmploymentLawMember" id="mg_LawsuitsForAllegedViolationOfCaliforniaLaborAndEmploymentLawMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="AcquisitionRelatedContingenciesMember" id="mg_AcquisitionRelatedContingenciesMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="BusinessAcquisitionContingentConsiderationPaymentPeriod" id="mg_BusinessAcquisitionContingentConsiderationPaymentPeriod" type="xbrli:durationItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ServicesMember" id="mg_ServicesMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ProductsAndSystemsMember" id="mg_ProductsAndSystemsMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="InternationalMember" id="mg_InternationalMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="OtherAmericasMember" id="mg_OtherAmericasMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="EuropeMember" id="mg_EuropeMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="AsiaPacificMember" id="mg_AsiaPacificMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="BusinessAcquisitionBusinessAcquisitionCostOfAcquiredEntityDebtAndOtherLiabilitiesAssumed" id="mg_BusinessAcquisitionBusinessAcquisitionCostOfAcquiredEntityDebtAndOtherLiabilitiesAssumed" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element name="BusinessAcquisitionContingentConsiderationLiabilitiesFairValue" id="mg_BusinessAcquisitionContingentConsiderationLiabilitiesFairValue" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element name="BusinessCombinationContingentConsiderationArrangementsChangeInAmountOfOperatingIncomeLoss" id="mg_BusinessCombinationContingentConsiderationArrangementsChangeInAmountOfOperatingIncomeLoss" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element name="OtherLongTermDebtMember" id="mg_OtherLongTermDebtMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="DebtInstrumentVariableRateBaseAxis" id="mg_DebtInstrumentVariableRateBaseAxis" type="xbrli:stringItemType" substitutionGroup="xbrldt:dimensionItem" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="DebtInstrumentVariableRateBaseDomain" id="mg_DebtInstrumentVariableRateBaseDomain" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="DebtInstrumentVariableRateBaseLIBORMember" id="mg_DebtInstrumentVariableRateBaseLIBORMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="DebtInstrumentVariableRateBaseBaseRateMember" id="mg_DebtInstrumentVariableRateBaseBaseRateMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="LineOfCreditFacilityMaximumBorrowingCapacityInNonUSCurrencies" id="mg_LineOfCreditFacilityMaximumBorrowingCapacityInNonUSCurrencies" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element name="LineOfCreditFacilityMaximumBorrowingCapacityAvailableForIssuanceOfLettersOfCredit" id="mg_LineOfCreditFacilityMaximumBorrowingCapacityAvailableForIssuanceOfLettersOfCredit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element name="DebtInstrumentAdditionalInterestRateDueToFundedDebtLeverageRatioExceedingSpecifiedThreshold" id="mg_DebtInstrumentAdditionalInterestRateDueToFundedDebtLeverageRatioExceedingSpecifiedThreshold" type="num:percentItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="DebtInstrumentImputedInterestRate" id="mg_DebtInstrumentImputedInterestRate" type="num:percentItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="DebtInstrumentNumberOfFiscalQuartersUsedForCalculationOfFundedDebtLeverageRatio" id="mg_DebtInstrumentNumberOfFiscalQuartersUsedForCalculationOfFundedDebtLeverageRatio" type="xbrli:integerItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="DebtInstrumentPrecedingPeriodUsedForCalculationOfInterestCoverageRatio" id="mg_DebtInstrumentPrecedingPeriodUsedForCalculationOfInterestCoverageRatio" type="xbrli:durationItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="DebtInstrumentCovenantFundedLeverageRatioConsideredForLowerInterestRateMargin" id="mg_DebtInstrumentCovenantFundedLeverageRatioConsideredForLowerInterestRateMargin" type="xbrli:pureItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="DebtInstrumentCovenantFundedLeverageRatioConsideredForMaximumInterestRateMargin" id="mg_DebtInstrumentCovenantFundedLeverageRatioConsideredForMaximumInterestRateMargin" type="xbrli:pureItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="DebtInstrumentCovenantInterestCoverageRatio" id="mg_DebtInstrumentCovenantInterestCoverageRatio" type="xbrli:pureItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="DebtInstrumentMaturityTerm" id="mg_DebtInstrumentMaturityTerm" type="xbrli:durationItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="PeriodForPaymentUnderNoncompeteAgreements" id="mg_PeriodForPaymentUnderNoncompeteAgreements" type="xbrli:durationItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="DebtInstrumentCovenantFundedDebtLeverageRatioForAdditionalInterestPayment" id="mg_DebtInstrumentCovenantFundedDebtLeverageRatioForAdditionalInterestPayment" type="xbrli:pureItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="DebtInstrumentCovenantFundedDebtLeverageRatio" id="mg_DebtInstrumentCovenantFundedDebtLeverageRatio" type="xbrli:pureItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="NoncontrollingInterestMaximumOwnershipPercentage" id="mg_NoncontrollingInterestMaximumOwnershipPercentage" type="num:percentItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" />
  <xsd:element name="NumberOfBusinessesAcquiredAsAssetPurchases" id="mg_NumberOfBusinessesAcquiredAsAssetPurchases" type="xbrli:integerItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="AccruedLiabilitiesDeferredRevenuesAndContingentConsiderationLiabilitiesCurrent" id="mg_AccruedLiabilitiesDeferredRevenuesAndContingentConsiderationLiabilitiesCurrent" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element name="AccruedLiabilitiesDeferredRevenuesAndContingentConsiderationLiabilitiesCurrentDisclosureTextBlock" id="mg_AccruedLiabilitiesDeferredRevenuesAndContingentConsiderationLiabilitiesCurrentDisclosureTextBlock" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="BusinessAcquisitionPurchasePriceAllocationCurrentAssetsAndCurrentLiabilitiesNet" id="mg_BusinessAcquisitionPurchasePriceAllocationCurrentAssetsAndCurrentLiabilitiesNet" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element name="ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfNonEmployeeDirectorsToWhomAwardIsGranted" id="mg_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfNonEmployeeDirectorsToWhomAwardIsGranted" type="xbrli:integerItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="PaymentsOfContingentConsiderationForBusinessAcquisitions" id="mg_PaymentsOfContingentConsiderationForBusinessAcquisitions" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element name="BusinessAcquisitionCostOfAcquiredEntityDebtRepaymentTerm" id="mg_BusinessAcquisitionCostOfAcquiredEntityDebtRepaymentTerm" type="xbrli:durationItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ContingentConsiderationFairValueDisclosure" id="mg_ContingentConsiderationFairValueDisclosure" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element name="ProceedsFromRepaymentsOfFormerLinesOfCredit" id="mg_ProceedsFromRepaymentsOfFormerLinesOfCredit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element name="BusinessAcquisitionCostOfAcquiredEntityDebtAndOtherLongTermLiabilitiesAssumed" id="mg_BusinessAcquisitionCostOfAcquiredEntityDebtAndOtherLongTermLiabilitiesAssumed" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element name="BusinessAcquisitionPurchasePriceAllocationDeferredTaxAssetsLiabilities" id="mg_BusinessAcquisitionPurchasePriceAllocationDeferredTaxAssetsLiabilities" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element name="BusinessAcquisitionOtherInformationAbstract" id="mg_BusinessAcquisitionOtherInformationAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="NumberOfBusinessesAcquiredAsAssetPurchasesInFrance" id="mg_NumberOfBusinessesAcquiredAsAssetPurchasesInFrance" type="xbrli:integerItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="NumberOfBusinessesAcquiredAsAssetPurchasesInCanada" id="mg_NumberOfBusinessesAcquiredAsAssetPurchasesInCanada" type="xbrli:integerItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" />
</xsd:schema>
