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  <xsd:element name="DeferredIncomeTaxNoncashExpenseBenefit" id="mg_DeferredIncomeTaxNoncashExpenseBenefit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element name="DeferredTaxAssetsCapitalLeaseObligation" id="mg_DeferredTaxAssetsCapitalLeaseObligation" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element name="DefinedContributionPlanContinuousServicePeriodAfterWhichEmployeesBecomeEligibleToParticipateUnderPlan" id="mg_DefinedContributionPlanContinuousServicePeriodAfterWhichEmployeesBecomeEligibleToParticipateUnderPlan" type="xbrli:durationItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="DefinedContributionPlanEmployersMatchingContributionAnnualVestingPeriod" id="mg_DefinedContributionPlanEmployersMatchingContributionAnnualVestingPeriod" type="xbrli:durationItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="DefinedContributionPlanLineItems" id="mg_DefinedContributionPlanLineItems" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="DefinedContributionPlanMinimumAgeForEmployeesToContributeCatchUpContributionsUnderIRSLimits" id="mg_DefinedContributionPlanMinimumAgeForEmployeesToContributeCatchUpContributionsUnderIRSLimits" type="xbrli:durationItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="DefinedContributionPlanTable" id="mg_DefinedContributionPlanTable" type="xbrli:stringItemType" substitutionGroup="xbrldt:hypercubeItem" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="DocumentAndEntityInformationAbstract" id="mg_DocumentAndEntityInformationAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="EmployeeStockOwnershipPlanNumberOfPlans" id="mg_EmployeeStockOwnershipPlanNumberOfPlans" type="xbrli:integerItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="FiniteLivedIntangibleAssetsFutureAmortizationExpenseTotal" id="mg_FiniteLivedIntangibleAssetsFutureAmortizationExpenseTotal" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element name="GoodwillDisclosureAbstract" id="mg_GoodwillDisclosureAbstract" type="xbrli:stringItemType" 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="IncreaseDecreaseInOtherAccruedLiabilitiesAndDeferredLiabilities" id="mg_IncreaseDecreaseInOtherAccruedLiabilitiesAndDeferredLiabilities" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element name="IncrementalCommonSharesAttributableToRestrictedStockUnitsOutstanding" id="mg_IncrementalCommonSharesAttributableToRestrictedStockUnitsOutstanding" type="xbrli:sharesItemType" 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="IntangibleAssetsDisclosureAbstract" id="mg_IntangibleAssetsDisclosureAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" 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="InterestRateDerivativesOutstandingAmount" id="mg_InterestRateDerivativesOutstandingAmount" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element name="InternationalMember" id="mg_InternationalMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="LawsuitForDamagesResultingFromAllegedQualityDefectsMember" id="mg_LawsuitForDamagesResultingFromAllegedQualityDefectsMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" 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="LineOfCreditFacilityMaximumBorrowingCapacityAvailableForIssuanceOfLettersOfCredit" id="mg_LineOfCreditFacilityMaximumBorrowingCapacityAvailableForIssuanceOfLettersOfCredit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element name="LineOfCreditFacilityMaximumBorrowingCapacityInNonUSCurrencies" id="mg_LineOfCreditFacilityMaximumBorrowingCapacityInNonUSCurrencies" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element name="LongTermIncentivePlan2009Member" id="mg_LongTermIncentivePlan2009Member" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="LossContingencyNumberOfLawsuitsYetToBeFiled" id="mg_LossContingencyNumberOfLawsuitsYetToBeFiled" type="xbrli:integerItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="MinimumAmountOfWorkersCompensationAndHealthBenefitClaimsForWhichThirdPartyExcessInsuranceCoverageMaintained" id="mg_MinimumAmountOfWorkersCompensationAndHealthBenefitClaimsForWhichThirdPartyExcessInsuranceCoverageMaintained" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="debit" 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="NumberOfMonthsLessThanActualPeriodFromAcquisitionForWhichResultsOfInternationalSegmentSubsidiariesAreIncludedInConsolidation" id="mg_NumberOfMonthsLessThanActualPeriodFromAcquisitionForWhichResultsOfInternationalSegmentSubsidiariesAreIncludedInConsolidation" type="xbrli:integerItemType" 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="OtherAmericasMember" id="mg_OtherAmericasMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" 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="PaymentsOfContingentConsiderationForBusinessAcquisitions" id="mg_PaymentsOfContingentConsiderationForBusinessAcquisitions" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="credit" 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="PeriodLagOfInternationalSegmentSubsidiariesConsolidated" id="mg_PeriodLagOfInternationalSegmentSubsidiariesConsolidated" type="xbrli:durationItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="PrinciplesOfConsolidationAbstract" id="mg_PrinciplesOfConsolidationAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ProceedsFromRepaymentsOfFormerLinesOfCredit" id="mg_ProceedsFromRepaymentsOfFormerLinesOfCredit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="debit" 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="RangeOfExercisePricesFromDollars13.46To22.35Member" id="mg_RangeOfExercisePricesFromDollars13.46To22.35Member" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="RangeOfExercisePricesFromDollars6.15To13.08Member" id="mg_RangeOfExercisePricesFromDollars6.15To13.08Member" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ReclassificationAbstract" id="mg_ReclassificationAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="RelatedPartyTransactionRentPayments" id="mg_RelatedPartyTransactionRentPayments" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element name="ReserveForUncertainTaxPositionsCurrent" id="mg_ReserveForUncertainTaxPositionsCurrent" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element name="RevenueRecognitionTaxesCollectedFromCustomersPolicyTextBlock" id="mg_RevenueRecognitionTaxesCollectedFromCustomersPolicyTextBlock" 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="ScheduleOfBusinessCombinationAcquisitionRelatedCostsTableTextBlock" id="mg_ScheduleOfBusinessCombinationAcquisitionRelatedCostsTableTextBlock" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="SelfInsuranceAbstract" id="mg_SelfInsuranceAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="SelfInsurancePolicyTextBlock" id="mg_SelfInsurancePolicyTextBlock" type="nonnum:textBlockItemType" 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="ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardPerformancePeriod" id="mg_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardPerformancePeriod" type="xbrli:durationItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfNonEmployeeDirectorsToWhomAwardIsGranted" id="mg_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfNonEmployeeDirectorsToWhomAwardIsGranted" type="xbrli:integerItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfPlansPriorToInitialPublicOffering" id="mg_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfPlansPriorToInitialPublicOffering" type="xbrli:integerItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeExercisableOptionsAbstract" id="mg_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeExercisableOptionsAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeOutstandingOptionsAbstract" id="mg_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeOutstandingOptionsAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ShareholderAndOfficerMember" id="mg_ShareholderAndOfficerMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="SignificantAccountingPoliciesAndRecentAccountingPronouncementsTextBlock" id="mg_SignificantAccountingPoliciesAndRecentAccountingPronouncementsTextBlock" type="nonnum:textBlockItemType" 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="StockOptionPlan2007Member" id="mg_StockOptionPlan2007Member" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="EmployeesMember" id="mg_EmployeesMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ExecutiveAndSeniorOfficersMember" id="mg_ExecutiveAndSeniorOfficersMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="BusinessCombinationContingentConsiderationPeriodOfOperationForSpecificPerformanceMetrics" id="mg_BusinessCombinationContingentConsiderationPeriodOfOperationForSpecificPerformanceMetrics" type="xbrli:durationItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="AssetProtectionBusinessInQuebecCanadaMember" id="mg_AssetProtectionBusinessInQuebecCanadaMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="AssetProtectionBusinessInUnitedKingdomMember" id="mg_AssetProtectionBusinessInUnitedKingdomMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="LawsuitDueToFaultyInspectionMember" id="mg_LawsuitDueToFaultyInspectionMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ShareBasedCompensationArrangementByShareBasedPaymentPercentageOfAwardPerformanceConditionBasedOnCompoundedAnnualGrowthRateForAdjustedEarningPerShare" id="mg_ShareBasedCompensationArrangementByShareBasedPaymentPercentageOfAwardPerformanceConditionBasedOnCompoundedAnnualGrowthRateForAdjustedEarningPerShare" type="num:percentItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ShareBasedCompensationArrangementByShareBasedPaymentPercentageOfAwardBasedOnTotalShareholderReturn" id="mg_ShareBasedCompensationArrangementByShareBasedPaymentPercentageOfAwardBasedOnTotalShareholderReturn" type="num:percentItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ExpirationPeriodAxis" id="mg_ExpirationPeriodAxis" type="xbrli:stringItemType" substitutionGroup="xbrldt:dimensionItem" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ExpirationPeriodDomain" id="mg_ExpirationPeriodDomain" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ExpirationDateStartingInFiscal2026Member" id="mg_ExpirationDateStartingInFiscal2026Member" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ExpirationDateStartingInFiscal2015Member" id="mg_ExpirationDateStartingInFiscal2015Member" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="AcquisitionsInFiscal2015Member" id="mg_AcquisitionsInFiscal2015Member" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredTaxAssetsCurrent" id="mg_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredTaxAssetsCurrent" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:balance="debit" xbrli:periodType="instant" />
</xsd:schema>
