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          <link:definition>999011 - Disclosure - Accounts receivable</link:definition>
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          <link:definition>999012 - Disclosure - Inventories</link:definition>
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          <link:definition>999018 - Disclosure - Short-term loans</link:definition>
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          <link:definition>999022 - Disclosure - Share capital</link:definition>
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          <link:definition>999023 - Disclosure - Capital surplus</link:definition>
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          <link:definition>999024 - Disclosure - Operating revenue</link:definition>
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          <link:definition>999025 - Disclosure - Finance costs</link:definition>
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          <link:definition>999027 - Disclosure - Income tax</link:definition>
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          <link:definition>999028 - Disclosure - (Loss) earnings per share</link:definition>
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          <link:definition>999029 - Disclosure - Related party transactions</link:definition>
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          <link:definition>999030 - Disclosure - Pledged assets</link:definition>
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          <link:definition>999031 - Disclosure - Capital management</link:definition>
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          <link:definition>999032 - Disclosure - Financial instruments</link:definition>
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          <link:definition>999036 - Disclosure - Summary of significant accounting policies (Policies)</link:definition>
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          <link:definition>999037 - Disclosure - Summary of significant accounting policies (Tables)</link:definition>
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          <link:definition>999039 - Disclosure - Accounts receivable (Tables)</link:definition>
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          <link:definition>999051 - Disclosure - Capital surplus (Tables)</link:definition>
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          <link:definition>999052 - Disclosure - Operating revenue (Tables)</link:definition>
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          <link:definition>999053 - Disclosure - Finance costs (Tables)</link:definition>
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          <link:definition>999054 - Disclosure - Expenses by nature (Tables)</link:definition>
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          <link:definition>999055 - Disclosure - Income tax (Tables)</link:definition>
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          <link:definition>999056 - Disclosure - (Loss) earnings per share (Tables)</link:definition>
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          <link:definition>999057 - Disclosure - Related party transactions (Tables)</link:definition>
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          <link:definition>999058 - Disclosure - Pledged assets (Tables)</link:definition>
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          <link:definition>999059 - Disclosure - Capital management (Tables)</link:definition>
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    <element id="YMAT_DisclosureOfDetailedInformationAboutLossAllowanceForAccountsReceivableExplanatory" name="DisclosureOfDetailedInformationAboutLossAllowanceForAccountsReceivableExplanatory" nillable="true" xbrli:periodType="duration" type="dtr-types:textBlockItemType" substitutionGroup="xbrli:item" />
    <element id="YMAT_SharesIssuedOfferingPrice" name="SharesIssuedOfferingPrice" nillable="true" xbrli:periodType="instant" type="dtr-types:perShareItemType" substitutionGroup="xbrli:item" />
    <element id="YMAT_PaymentOfOfferingExpenses" name="PaymentOfOfferingExpenses" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="YMAT_AdditionalOfferingExpenses" name="AdditionalOfferingExpenses" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="YMAT_UnderwritingDiscountsAndCommissionsAndTotalOffering" name="UnderwritingDiscountsAndCommissionsAndTotalOffering" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="YMAT_NetAmountRecognizedInAdditionalPaidinCapital" name="NetAmountRecognizedInAdditionalPaidinCapital" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="YMAT_IfrsStatementTable" name="IfrsStatementTable" abstract="true" nillable="true" xbrli:periodType="duration" type="xbrli:stringItemType" substitutionGroup="xbrldt:hypercubeItem" />
    <element id="YMAT_AllowanceForCreditLoss" name="AllowanceForCreditLoss" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="YMAT_ReversalOfLossOnInventoryWritedown" name="ReversalOfLossOnInventoryWritedown" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="YMAT_PrepaidSalesTax" name="PrepaidSalesTax" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="YMAT_PrepaymentForBusinessExpansion" name="PrepaymentForBusinessExpansion" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="YMAT_PropertyPlantAndEquipments" name="PropertyPlantAndEquipments" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="YMAT_DisposalsAccumulatedDepreciationPropertyPlantAndEquipment" name="DisposalsAccumulatedDepreciationPropertyPlantAndEquipment" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="YMAT_PaymentOfDeposits" name="PaymentOfDeposits" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="YMAT_DepositAndObtainedMortgage" name="DepositAndObtainedMortgage" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="YMAT_OtherExpensePayable" name="OtherExpensePayable" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="YMAT_CurrentLoanAndReceivables" name="CurrentLoanAndReceivables" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="YMAT_IncreaseDecreaseThroughConversionOfShareholderLoanToShares" name="IncreaseDecreaseThroughConversionOfShareholderLoanToShares" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="YMAT_IncreaseDecreaseThroughCancellationOfShareholderLoan" name="IncreaseDecreaseThroughCancellationOfShareholderLoan" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="YMAT_IncreaseDecreaseThroughSharebasedCompensation" name="IncreaseDecreaseThroughSharebasedCompensation" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="YMAT_ConversionPrice" name="ConversionPrice" nillable="true" xbrli:periodType="instant" type="dtr-types:perShareItemType" substitutionGroup="xbrli:item" />
    <element id="YMAT_ProductOrServicesAxis" name="ProductOrServicesAxis" abstract="true" nillable="true" xbrli:periodType="duration" type="xbrli:stringItemType" substitutionGroup="xbrldt:dimensionItem" />
    <element id="YMAT_ProductOrServicesDomain" name="ProductOrServicesDomain" abstract="true" nillable="true" xbrli:periodType="duration" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" />
    <element id="YMAT_PurchaseAndSaleOfMerchandiseInventory" name="PurchaseAndSaleOfMerchandiseInventory" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="YMAT_FreightExpenses" name="FreightExpenses" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="YMAT_DepreciationExpensesrightofuseAssets" name="DepreciationExpensesrightofuseAssets" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="YMAT_PurchaseOfGoods" name="PurchaseOfGoods" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="YMAT_KeyManagementPersonnelCompensationSalariesAndOtherShorttermEmployeeBenefits" name="KeyManagementPersonnelCompensationSalariesAndOtherShorttermEmployeeBenefits" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="YMAT_KeyManagementlCompensation" name="KeyManagementlCompensation" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="YMAT_GuaranteeDepositsPaid" name="GuaranteeDepositsPaid" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="YMAT_CapitalManagement" name="CapitalManagement" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="YMAT_GearingRatio" name="GearingRatio" nillable="true" xbrli:periodType="instant" type="dtr-types:percentItemType" substitutionGroup="xbrli:item" />
    <element id="YMAT_LongtermDeposit" name="LongtermDeposit" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="YMAT_ForeignCurrencyAmountFinancialAssets" name="ForeignCurrencyAmountFinancialAssets" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="YMAT_FinancialAssetsExchangeRate" name="FinancialAssetsExchangeRate" nillable="true" xbrli:periodType="instant" type="xbrli:decimalItemType" substitutionGroup="xbrli:item" />
    <element id="YMAT_FinancialAssetsBookValue" name="FinancialAssetsBookValue" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="YMAT_ForeignCurrencyAmountFinancialLiabilities" name="ForeignCurrencyAmountFinancialLiabilities" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="YMAT_FinancialLiabilitiesExchangeRate" name="FinancialLiabilitiesExchangeRate" nillable="true" xbrli:periodType="instant" type="xbrli:decimalItemType" substitutionGroup="xbrli:item" />
    <element id="YMAT_FinancialLiabilitiesBookValue" name="FinancialLiabilitiesBookValue" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="YMAT_FinancialAssetsDegreeOfVariationPercentageNTD" name="FinancialAssetsDegreeOfVariationPercentageNTD" nillable="true" xbrli:periodType="instant" type="dtr-types:percentItemType" substitutionGroup="xbrli:item" />
    <element id="YMAT_FinancialAssetsEffectOnProfitOrLoss" name="FinancialAssetsEffectOnProfitOrLoss" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="YMAT_FinancialAssetsEffectOnOtherComprehensiveIncome" name="FinancialAssetsEffectOnOtherComprehensiveIncome" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="YMAT_FinancialAssetsDegreeOfVariationPercentageHKD" name="FinancialAssetsDegreeOfVariationPercentageHKD" nillable="true" xbrli:periodType="instant" type="dtr-types:percentItemType" substitutionGroup="xbrli:item" />
    <element id="YMAT_FinancialLiabilitiesDegreeOfVariationPercentageNTD" name="FinancialLiabilitiesDegreeOfVariationPercentageNTD" nillable="true" xbrli:periodType="instant" type="dtr-types:percentItemType" substitutionGroup="xbrli:item" />
    <element id="YMAT_FinancialLiabilitiesEffectOnProfitOrLoss" name="FinancialLiabilitiesEffectOnProfitOrLoss" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="YMAT_FinancialLiabilitiesEffectOnOtherComprehensiveIncome" name="FinancialLiabilitiesEffectOnOtherComprehensiveIncome" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="YMAT_FinancialLiabilitiesDegreeOfVariationPercentageHKD" name="FinancialLiabilitiesDegreeOfVariationPercentageHKD" nillable="true" xbrli:periodType="instant" type="dtr-types:percentItemType" substitutionGroup="xbrli:item" />
    <element id="YMAT_ProfitIncreasedDecreased" name="ProfitIncreasedDecreased" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="YMAT_ExpectedLossRate" name="ExpectedLossRate" nillable="true" xbrli:periodType="instant" type="dtr-types:percentItemType" substitutionGroup="xbrli:item" />
    <element id="YMAT_AccountsReceivables" name="AccountsReceivables" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="YMAT_CreditLossForAllowance" name="CreditLossForAllowance" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="YMAT_LossAllowance" name="LossAllowance" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="YMAT_ProvisionForExpectedCreditLosses" name="ProvisionForExpectedCreditLosses" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="YMAT_OtherReceivablesIncludingLongTermReceivables" name="OtherReceivablesIncludingLongTermReceivables" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="YMAT_BankLoan" name="BankLoan" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="YMAT_ShortTtermBankLoans" name="ShortTtermBankLoans" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="YMAT_LongTermLoansCurrent" name="LongTermLoansCurrent" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="YMAT_IncreaseddecreasedBorrowingInterestRatePercentage" name="IncreaseddecreasedBorrowingInterestRatePercentage" nillable="true" xbrli:periodType="instant" type="dtr-types:percentItemType" substitutionGroup="xbrli:item" />
    <element id="YMAT_PercentageOfAverageDailyTradingValue" name="PercentageOfAverageDailyTradingValue" nillable="true" xbrli:periodType="instant" type="dtr-types:percentItemType" substitutionGroup="xbrli:item" />
    <element id="YMAT_InitialPurchasePricePercentage" name="InitialPurchasePricePercentage" nillable="true" xbrli:periodType="instant" type="dtr-types:percentItemType" substitutionGroup="xbrli:item" />
</schema>
