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  <xsd:element id="glgi_NetChangesInDeferredTaxOther" name="NetChangesInDeferredTaxOther" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration"/>
  <xsd:element id="glgi_NetChangesInDepreciationAndAmortizationInExcessOfFinancial" name="NetChangesInDepreciationAndAmortizationInExcessOfFinancial" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration"/>
  <xsd:element id="glgi_NetChangesInNetOperatingLossCarryforward" name="NetChangesInNetOperatingLossCarryforward" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="glgi_NoncancellableLeasesMember" name="NoncancellableLeasesMember" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:domainItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="glgi_NoteToFinancialStatementDetailsTextual" name="NoteToFinancialStatementDetailsTextual" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="glgi_NotesToFinancialStatements" name="NotesToFinancialStatements" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="glgi_NotesToFinancialStatementsAbstract" name="NotesToFinancialStatementsAbstract" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/>
  <xsd:element id="glgi_NumberOfCustomers" name="NumberOfCustomers" nillable="true" substitutionGroup="xbrli:item" type="xbrli:integerItemType" xbrli:periodType="duration"/>
  <xsd:element id="glgi_OfficeSpaceLeaseMember" name="OfficeSpaceLeaseMember" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:domainItemType" xbrli:periodType="duration"/>
  <xsd:element id="glgi_PaymentsForRetirementOfCommonStock" name="PaymentsForRetirementOfCommonStock" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration"/>
  <xsd:element id="glgi_PaymentsForRetirementOfPreferredStock" name="PaymentsForRetirementOfPreferredStock" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="instant"/>
  <xsd:element id="glgi_PlantBuildingMember" name="PlantBuildingMember" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:domainItemType" xbrli:periodType="duration"/>
  <xsd:element id="glgi_PlantBuildingsAndLandMember" name="PlantBuildingsAndLandMember" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:domainItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="glgi_PolicyTable" name="PolicyTable" nillable="true" substitutionGroup="xbrldt:hypercubeItem" type="xbrli:stringItemType" xbrli:periodType="duration"/>
  <xsd:element id="glgi_PreferredStockDividendRateBasisSpreadPercentage" name="PreferredStockDividendRateBasisSpreadPercentage" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:percentItemType" xbrli:periodType="duration"/>
  <xsd:element id="glgi_PreferredStockStatedValuePerShare" name="PreferredStockStatedValuePerShare" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:perShareItemType" xbrli:periodType="instant"/>
  <xsd:element id="glgi_PrimeRate" name="PrimeRate" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:percentItemType" xbrli:periodType="instant"/>
  <xsd:element id="glgi_RepaymentsOfLongTermDebtAndFinanceLease" name="RepaymentsOfLongTermDebtAndFinanceLease" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="glgi_RetiredPreferredStockMember" name="RetiredPreferredStockMember" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:domainItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="glgi_RevolvingLoanToInternationalBankOfCommerceMember" name="RevolvingLoanToInternationalBankOfCommerceMember" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:domainItemType" xbrli:periodType="duration"/>
  <xsd:element id="glgi_ScheduleOfFinancingLeaseTableTextBlock" name="ScheduleOfFinancingLeaseTableTextBlock" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:textBlockItemType" xbrli:periodType="duration"/>
  <xsd:element id="glgi_ScheduleOfOperatingLeaseTableTextBlock" name="ScheduleOfOperatingLeaseTableTextBlock" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:textBlockItemType" xbrli:periodType="duration"/>
  <xsd:element id="glgi_ScheduleOfUsefulLifeOfPropertyPlantAndEquipmentTableTextBlock" name="ScheduleOfUsefulLifeOfPropertyPlantAndEquipmentTableTextBlock" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:textBlockItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="glgi_Series2003PreferredStockMember" name="Series2003PreferredStockMember" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:domainItemType" xbrli:periodType="duration"/>
  <xsd:element id="glgi_SummaryOfNetChangeInDeferredTaxesTableTextBlock" name="SummaryOfNetChangeInDeferredTaxesTableTextBlock" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:textBlockItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="glgi_TermLoanToFirstInterstateBankMember" name="TermLoanToFirstInterstateBankMember" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:domainItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="glgi_TermLoanToInternationalBankOfCommerceMember" name="TermLoanToInternationalBankOfCommerceMember" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:domainItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="glgi_The401kPlanMember" name="The401kPlanMember" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:domainItemType" xbrli:periodType="duration"/>
  <xsd:element id="glgi_TreasurySharesCommonSharesRetired" name="TreasurySharesCommonSharesRetired" nillable="true" substitutionGroup="xbrli:item" type="xbrli:sharesItemType" xbrli:periodType="duration"/>
  <xsd:element id="glgi_TriEndaHoldingsLLCMember" name="TriEndaHoldingsLLCMember" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:domainItemType" xbrli:periodType="duration"/>
  <xsd:element id="glgi_TwoBuildingsMember" name="TwoBuildingsMember" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:domainItemType" xbrli:periodType="duration"/>
  <xsd:element id="glgi_TwoCustomersMember" name="TwoCustomersMember" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:domainItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="glgi_WarrantsExercisableIntoCommonStockMember" name="WarrantsExercisableIntoCommonStockMember" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:domainItemType" xbrli:periodType="duration"/>
  <xsd:element id="glgi_WeeklyRentalExpenses" name="WeeklyRentalExpenses" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration"/>
  <xsd:element id="glgi_YorktownMember" name="YorktownMember" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:domainItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="glgi_statement-statement-insidertradingpoliciesproc" name="statement-statement-insidertradingpoliciesproc" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="glgi_statement-statement-note-1-summary-of-significant-accounting-policies-summary-of-useful-life-of-property-plant-and-equipment-details" name="statement-statement-note-1-summary-of-significant-accounting-policies-summary-of-useful-life-of-property-plant-and-equipment-details" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="glgi_statement-statement-note-1-summary-of-significant-accounting-policies-tables" name="statement-statement-note-1-summary-of-significant-accounting-policies-tables" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="glgi_statement-statement-note-10-income-taxes-reconciliation-of-effective-income-tax-rate-details" name="statement-statement-note-10-income-taxes-reconciliation-of-effective-income-tax-rate-details" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="glgi_statement-statement-note-10-income-taxes-summary-of-changes-in-deferred-tax-details" name="statement-statement-note-10-income-taxes-summary-of-changes-in-deferred-tax-details" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="glgi_statement-statement-note-10-income-taxes-summary-of-deferred-tax-assets-and-liabilities-details" name="statement-statement-note-10-income-taxes-summary-of-deferred-tax-assets-and-liabilities-details" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="glgi_statement-statement-note-10-income-taxes-summary-of-income-tax-expense-details" name="statement-statement-note-10-income-taxes-summary-of-income-tax-expense-details" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="glgi_statement-statement-note-10-income-taxes-tables" name="statement-statement-note-10-income-taxes-tables" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="glgi_statement-statement-note-14-supplemental-information-of-cash-flows-schedule-of-cash-flows-details" name="statement-statement-note-14-supplemental-information-of-cash-flows-schedule-of-cash-flows-details" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="glgi_statement-statement-note-14-supplemental-information-of-cash-flows-tables" name="statement-statement-note-14-supplemental-information-of-cash-flows-tables" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="glgi_statement-statement-note-3-earnings-loss-per-share-schedule-of-basic-and-diluted-earnings-per-share-details" name="statement-statement-note-3-earnings-loss-per-share-schedule-of-basic-and-diluted-earnings-per-share-details" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="glgi_statement-statement-note-3-earnings-loss-per-share-tables" name="statement-statement-note-3-earnings-loss-per-share-tables" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="glgi_statement-statement-note-4-inventory-summary-of-inventory-details" name="statement-statement-note-4-inventory-summary-of-inventory-details" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="glgi_statement-statement-note-4-inventory-tables" name="statement-statement-note-4-inventory-tables" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="glgi_statement-statement-note-5-property-plant-and-equipment-summary-of-property-plant-and-equipment-details" name="statement-statement-note-5-property-plant-and-equipment-summary-of-property-plant-and-equipment-details" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="glgi_statement-statement-note-5-property-plant-and-equipment-tables" name="statement-statement-note-5-property-plant-and-equipment-tables" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="glgi_statement-statement-note-6-longterm-debt-summary-of-longterm-debt-details" name="statement-statement-note-6-longterm-debt-summary-of-longterm-debt-details" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="glgi_statement-statement-note-6-longterm-debt-summary-of-longterm-debt-details-parentheticals" name="statement-statement-note-6-longterm-debt-summary-of-longterm-debt-details-parentheticals" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="glgi_statement-statement-note-6-longterm-debt-tables" name="statement-statement-note-6-longterm-debt-tables" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="glgi_statement-statement-note-7-leases-schedule-of-financing-lease-details" name="statement-statement-note-7-leases-schedule-of-financing-lease-details" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="glgi_statement-statement-note-7-leases-schedule-of-financing-lease-details6D98B235-CEF3-4325-95B9-28169D9D772C" name="statement-statement-note-7-leases-schedule-of-financing-lease-details6D98B235-CEF3-4325-95B9-28169D9D772C" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="glgi_statement-statement-note-7-leases-schedule-of-operating-lease-details" name="statement-statement-note-7-leases-schedule-of-operating-lease-details" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="glgi_statement-statement-note-7-leases-summary-of-lease-activity-details" name="statement-statement-note-7-leases-summary-of-lease-activity-details" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="glgi_statement-statement-note-7-leases-tables" name="statement-statement-note-7-leases-tables" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="glgi_statement-statement-note-8-revenue-details" name="statement-statement-note-8-revenue-details" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="glgi_statement-statement-note-8-revenue-tables" name="statement-statement-note-8-revenue-tables" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="glgi_statement-statement-notes-7-leases-summary-of-liability-maturity-details" name="statement-statement-notes-7-leases-summary-of-liability-maturity-details" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="glgi_statement-statement-significant-accounting-policies-policies" name="statement-statement-significant-accounting-policies-policies" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/>
</xsd:schema>
