<?xml version="1.0" encoding="UTF-8"?>
<!-- Generated by Fujitsu Interstage XWand B0255 -->
<link:linkbase xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.xbrl.org/2003/linkbase http://www.xbrl.org/2003/xbrl-linkbase-2003-12-31.xsd" xmlns:ovs="http://www.ovs.it/2022-01-31" xmlns:link="http://www.xbrl.org/2003/linkbase" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xbrli="http://www.xbrl.org/2003/instance">
  <link:roleRef roleURI="http://www.ovs.it/role/Anchoring" xlink:type="simple" xlink:href="ovs-2022-01-31.xsd#Anchoring"/>
  <link:roleRef roleURI="http://www.ovs.it/role/StatementConsolidatedIncomeStatement" xlink:type="simple" xlink:href="ovs-2022-01-31.xsd#StatementConsolidatedIncomeStatement"/>
  <link:roleRef roleURI="http://www.ovs.it/role/StatementConsolidatedStatementsOfComprehensiveIncome" xlink:type="simple" xlink:href="ovs-2022-01-31.xsd#StatementConsolidatedStatementsOfComprehensiveIncome"/>
  <link:roleRef roleURI="http://www.ovs.it/role/StatementConsolidatedStatementsOfFinancialPosition" xlink:type="simple" xlink:href="ovs-2022-01-31.xsd#StatementConsolidatedStatementsOfFinancialPosition"/>
  <link:roleRef roleURI="http://www.ovs.it/role/StatementConsolidatedStatementsOfChangesInEquity" xlink:type="simple" xlink:href="ovs-2022-01-31.xsd#StatementConsolidatedStatementsOfChangesInEquity"/>
  <link:roleRef roleURI="http://www.ovs.it/role/StatementConsolidatedStatementsOfCashFlows" xlink:type="simple" xlink:href="ovs-2022-01-31.xsd#StatementConsolidatedStatementsOfCashFlows"/>
  <link:roleRef roleURI="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="simple" xlink:href="http://www.xbrl.org/lrr/role/negated-2009-12-16.xsd#negatedLabel"/>
  <link:roleRef roleURI="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="simple" xlink:href="http://www.xbrl.org/lrr/role/negated-2009-12-16.xsd#negatedTerseLabel"/>
  <link:roleRef roleURI="http://www.xbrl.org/2009/role/negatedTotalLabel" xlink:type="simple" xlink:href="http://www.xbrl.org/lrr/role/negated-2009-12-16.xsd#negatedTotalLabel"/>
  <link:roleRef roleURI="http://www.xbrl.org/2009/role/netLabel" xlink:type="simple" xlink:href="http://www.xbrl.org/lrr/role/net-2009-12-16.xsd#netLabel"/>
  <link:roleRef roleURI="http://www.xbrl.org/2009/role/negatedPeriodEndLabel" xlink:type="simple" xlink:href="http://www.xbrl.org/lrr/role/negated-2009-12-16.xsd#negatedPeriodEndLabel"/>
  <link:roleRef roleURI="http://www.xbrl.org/2009/role/negatedPeriodStartLabel" xlink:type="simple" xlink:href="http://www.xbrl.org/lrr/role/negated-2009-12-16.xsd#negatedPeriodStartLabel"/>
  <link:roleRef roleURI="http://www.ovs.it/role/Notes" xlink:type="simple" xlink:href="ovs-2022-01-31.xsd#DisclosureNotes"/>
  <link:presentationLink xlink:type="extended" xlink:role="http://www.ovs.it/role/Notes" xml:lang="en">
    <link:loc xlink:type="locator" xlink:href="http://www.esma.europa.eu/taxonomy/2020-03-16/esef_cor.xsd#esef_cor_NotesAccountingPoliciesAndMandatoryTags" xlink:label="NotesAccountingPoliciesAndMandatoryTags" xlink:title="NotesAccountingPoliciesAndMandatoryTags"/>
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_NameOfReportingEntityOrOtherMeansOfIdentification" xlink:label="NameOfReportingEntityOrOtherMeansOfIdentification" xlink:title="NameOfReportingEntityOrOtherMeansOfIdentification"/>
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="NotesAccountingPoliciesAndMandatoryTags" xlink:to="NameOfReportingEntityOrOtherMeansOfIdentification" xlink:title="presentation: NotesAccountingPoliciesAndMandatoryTags to NameOfReportingEntityOrOtherMeansOfIdentification" order="1.0"/>
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_DomicileOfEntity" xlink:label="DomicileOfEntity" xlink:title="DomicileOfEntity"/>
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="NotesAccountingPoliciesAndMandatoryTags" xlink:to="DomicileOfEntity" xlink:title="presentation: NotesAccountingPoliciesAndMandatoryTags to DomicileOfEntity" order="3.0"/>
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_LegalFormOfEntity" xlink:label="LegalFormOfEntity" xlink:title="LegalFormOfEntity"/>
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="NotesAccountingPoliciesAndMandatoryTags" xlink:to="LegalFormOfEntity" xlink:title="presentation: NotesAccountingPoliciesAndMandatoryTags to LegalFormOfEntity" order="4.0"/>
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_CountryOfIncorporation" xlink:label="CountryOfIncorporation" xlink:title="CountryOfIncorporation"/>
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="NotesAccountingPoliciesAndMandatoryTags" xlink:to="CountryOfIncorporation" xlink:title="presentation: NotesAccountingPoliciesAndMandatoryTags to CountryOfIncorporation" order="5.0"/>
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_AddressOfRegisteredOfficeOfEntity" xlink:label="AddressOfRegisteredOfficeOfEntity" xlink:title="AddressOfRegisteredOfficeOfEntity"/>
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="NotesAccountingPoliciesAndMandatoryTags" xlink:to="AddressOfRegisteredOfficeOfEntity" xlink:title="presentation: NotesAccountingPoliciesAndMandatoryTags to AddressOfRegisteredOfficeOfEntity" order="6.0"/>
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_PrincipalPlaceOfBusiness" xlink:label="PrincipalPlaceOfBusiness" xlink:title="PrincipalPlaceOfBusiness"/>
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="NotesAccountingPoliciesAndMandatoryTags" xlink:to="PrincipalPlaceOfBusiness" xlink:title="presentation: NotesAccountingPoliciesAndMandatoryTags to PrincipalPlaceOfBusiness" order="7.0"/>
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_DescriptionOfNatureOfEntitysOperationsAndPrincipalActivities" xlink:label="DescriptionOfNatureOfEntitysOperationsAndPrincipalActivities" xlink:title="DescriptionOfNatureOfEntitysOperationsAndPrincipalActivities"/>
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="NotesAccountingPoliciesAndMandatoryTags" xlink:to="DescriptionOfNatureOfEntitysOperationsAndPrincipalActivities" xlink:title="presentation: NotesAccountingPoliciesAndMandatoryTags to DescriptionOfNatureOfEntitysOperationsAndPrincipalActivities" order="8.0"/>
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_NameOfParentEntity" xlink:label="NameOfParentEntity" xlink:title="NameOfParentEntity"/>
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="NotesAccountingPoliciesAndMandatoryTags" xlink:to="NameOfParentEntity" xlink:title="presentation: NotesAccountingPoliciesAndMandatoryTags to NameOfParentEntity" order="9.0"/>
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_NameOfUltimateParentOfGroup" xlink:label="NameOfUltimateParentOfGroup" xlink:title="NameOfUltimateParentOfGroup"/>
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="NotesAccountingPoliciesAndMandatoryTags" xlink:to="NameOfUltimateParentOfGroup" xlink:title="presentation: NotesAccountingPoliciesAndMandatoryTags to NameOfUltimateParentOfGroup" order="10.0"/>
  </link:presentationLink>
  <link:presentationLink xlink:type="extended" xlink:role="http://www.ovs.it/role/StatementConsolidatedStatementsOfCashFlows">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_StatementOfCashFlowsAbstract" xlink:label="StatementOfCashFlowsAbstract" xlink:title="StatementOfCashFlowsAbstract"/>
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_IncreaseDecreaseInCashAndCashEquivalents" xlink:label="IncreaseDecreaseInCashAndCashEquivalents" xlink:title="IncreaseDecreaseInCashAndCashEquivalents"/>
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="StatementOfCashFlowsAbstract" xlink:to="IncreaseDecreaseInCashAndCashEquivalents" order="2.0"/>
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_CashFlowsFromUsedInOperatingActivities" xlink:label="CashFlowsFromUsedInOperatingActivities" xlink:title="CashFlowsFromUsedInOperatingActivities"/>
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="IncreaseDecreaseInCashAndCashEquivalents" xlink:to="CashFlowsFromUsedInOperatingActivities" xlink:title="presentation: IncreaseDecreaseInCashAndCashEquivalents to CashFlowsFromUsedInOperatingActivities" order="1.0"/>
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_CashFlowsFromUsedInOperationsBeforeChangesInWorkingCapital" xlink:label="CashFlowsFromUsedInOperationsBeforeChangesInWorkingCapital" xlink:title="CashFlowsFromUsedInOperationsBeforeChangesInWorkingCapital"/>
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="CashFlowsFromUsedInOperatingActivities" xlink:to="CashFlowsFromUsedInOperationsBeforeChangesInWorkingCapital" xlink:title="presentation: CashFlowsFromUsedInOperatingActivities to CashFlowsFromUsedInOperationsBeforeChangesInWorkingCapital" order="1.0"/>
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_ProfitLoss" xlink:label="ProfitLoss" xlink:title="ProfitLoss"/>
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="CashFlowsFromUsedInOperationsBeforeChangesInWorkingCapital" xlink:to="ProfitLoss" xlink:title="presentation: CashFlowsFromUsedInOperationsBeforeChangesInWorkingCapital to ProfitLoss" order="1.0"/>
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_AdjustmentsForLossesGainsOnDisposalOfNoncurrentAssets" xlink:label="AdjustmentsForLossesGainsOnDisposalOfNoncurrentAssets" xlink:title="AdjustmentsForLossesGainsOnDisposalOfNoncurrentAssets"/>
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="CashFlowsFromUsedInOperationsBeforeChangesInWorkingCapital" xlink:to="AdjustmentsForLossesGainsOnDisposalOfNoncurrentAssets" xlink:title="presentation: CashFlowsFromUsedInOperationsBeforeChangesInWorkingCapital to AdjustmentsForLossesGainsOnDisposalOfNoncurrentAssets" order="5.0"/>
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_AdjustmentsForDepreciationAndAmortisationExpense" xlink:label="AdjustmentsForDepreciationAndAmortisationExpense" xlink:title="AdjustmentsForDepreciationAndAmortisationExpense"/>
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="CashFlowsFromUsedInOperationsBeforeChangesInWorkingCapital" xlink:to="AdjustmentsForDepreciationAndAmortisationExpense" xlink:title="presentation: CashFlowsFromUsedInOperationsBeforeChangesInWorkingCapital to AdjustmentsForDepreciationAndAmortisationExpense" order="3.0"/>
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_AdjustmentsForIncomeTaxExpense" xlink:label="AdjustmentsForIncomeTaxExpense" xlink:title="AdjustmentsForIncomeTaxExpense"/>
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="CashFlowsFromUsedInOperationsBeforeChangesInWorkingCapital" xlink:to="AdjustmentsForIncomeTaxExpense" xlink:title="presentation: CashFlowsFromUsedInOperationsBeforeChangesInWorkingCapital to AdjustmentsForIncomeTaxExpense" order="2.0"/>
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_AdjustmentsForGainLossOnDisposalOfInvestmentsInSubsidiariesJointVenturesAndAssociates" xlink:label="AdjustmentsForGainLossOnDisposalOfInvestmentsInSubsidiariesJointVenturesAndAssociates" xlink:title="AdjustmentsForGainLossOnDisposalOfInvestmentsInSubsidiariesJointVenturesAndAssociates"/>
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="CashFlowsFromUsedInOperationsBeforeChangesInWorkingCapital" xlink:to="AdjustmentsForGainLossOnDisposalOfInvestmentsInSubsidiariesJointVenturesAndAssociates" xlink:title="presentation: CashFlowsFromUsedInOperationsBeforeChangesInWorkingCapital to AdjustmentsForGainLossOnDisposalOfInvestmentsInSubsidiariesJointVenturesAndAssociates" order="6.0" preferredLabel="http://www.xbrl.org/2009/role/negatedLabel"/>
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_AdjustmentsForFinanceCosts" xlink:label="AdjustmentsForFinanceCosts" xlink:title="AdjustmentsForFinanceCosts"/>
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="CashFlowsFromUsedInOperationsBeforeChangesInWorkingCapital" xlink:to="AdjustmentsForFinanceCosts" xlink:title="presentation: CashFlowsFromUsedInOperationsBeforeChangesInWorkingCapital to AdjustmentsForFinanceCosts" order="7.0"/>
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_AdjustmentsForUnrealisedForeignExchangeLossesGains" xlink:label="AdjustmentsForUnrealisedForeignExchangeLossesGains" xlink:title="AdjustmentsForUnrealisedForeignExchangeLossesGains"/>
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="CashFlowsFromUsedInOperationsBeforeChangesInWorkingCapital" xlink:to="AdjustmentsForUnrealisedForeignExchangeLossesGains" xlink:title="presentation: CashFlowsFromUsedInOperationsBeforeChangesInWorkingCapital to AdjustmentsForUnrealisedForeignExchangeLossesGains" order="8.0"/>
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_AdjustmentsForFairValueGainsLosses" xlink:label="AdjustmentsForFairValueGainsLosses" xlink:title="AdjustmentsForFairValueGainsLosses"/>
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="CashFlowsFromUsedInOperationsBeforeChangesInWorkingCapital" xlink:to="AdjustmentsForFairValueGainsLosses" xlink:title="presentation: CashFlowsFromUsedInOperationsBeforeChangesInWorkingCapital to AdjustmentsForFairValueGainsLosses" order="9.0"/>
    <link:loc xlink:type="locator" xlink:href="ovs-2022-01-31.xsd#ovs_WriteOffOfEquityInvestment" xlink:label="Write-offofEquityInvestment" xlink:title="Write-offofEquityInvestment"/>
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="CashFlowsFromUsedInOperationsBeforeChangesInWorkingCapital" xlink:to="Write-offofEquityInvestment" xlink:title="presentation: CashFlowsFromUsedInOperationsBeforeChangesInWorkingCapital to Write-offofEquityInvestment" order="4.0"/>
    <link:loc xlink:type="locator" xlink:href="ovs-2022-01-31.xsd#ovs_AllocationsToProvisions" xlink:label="AllocationsToProvisions" xlink:title="AllocationsToProvisions"/>
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="CashFlowsFromUsedInOperationsBeforeChangesInWorkingCapital" xlink:to="AllocationsToProvisions" xlink:title="presentation: CashFlowsFromUsedInOperationsBeforeChangesInWorkingCapital to AllocationsToProvisions" order="10.0"/>
    <link:loc xlink:type="locator" xlink:href="ovs-2022-01-31.xsd#ovs_UtilisationOfProvisions" xlink:label="UtilisationOfProvisions" xlink:title="UtilisationOfProvisions"/>
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="CashFlowsFromUsedInOperationsBeforeChangesInWorkingCapital" xlink:to="UtilisationOfProvisions" xlink:title="presentation: CashFlowsFromUsedInOperationsBeforeChangesInWorkingCapital to UtilisationOfProvisions" order="11.0"/>
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_IncreaseDecreaseInWorkingCapital" xlink:label="IncreaseDecreaseInWorkingCapital" xlink:title="IncreaseDecreaseInWorkingCapital"/>
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="CashFlowsFromUsedInOperatingActivities" xlink:to="IncreaseDecreaseInWorkingCapital" xlink:title="presentation: CashFlowsFromUsedInOperatingActivities to IncreaseDecreaseInWorkingCapital" order="2.0" preferredLabel="http://www.xbrl.org/2009/role/negatedLabel"/>
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_IncomeTaxesPaidRefundClassifiedAsOperatingActivities" xlink:label="IncomeTaxesPaidRefundClassifiedAsOperatingActivities" xlink:title="IncomeTaxesPaidRefundClassifiedAsOperatingActivities"/>
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="CashFlowsFromUsedInOperatingActivities" xlink:to="IncomeTaxesPaidRefundClassifiedAsOperatingActivities" xlink:title="presentation: CashFlowsFromUsedInOperatingActivities to IncomeTaxesPaidRefundClassifiedAsOperatingActivities" order="3.0" preferredLabel="http://www.xbrl.org/2009/role/negatedTerseLabel"/>
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_InterestPaidClassifiedAsOperatingActivities" xlink:label="InterestPaidClassifiedAsOperatingActivities" xlink:title="InterestPaidClassifiedAsOperatingActivities"/>
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="CashFlowsFromUsedInOperatingActivities" xlink:to="InterestPaidClassifiedAsOperatingActivities" xlink:title="presentation: CashFlowsFromUsedInOperatingActivities to InterestPaidClassifiedAsOperatingActivities" order="4.0" preferredLabel="http://www.xbrl.org/2009/role/negatedTerseLabel"/>
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_OtherInflowsOutflowsOfCashClassifiedAsOperatingActivities" xlink:label="OtherInflowsOutflowsOfCashClassifiedAsOperatingActivities" xlink:title="OtherInflowsOutflowsOfCashClassifiedAsOperatingActivities"/>
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="CashFlowsFromUsedInOperatingActivities" xlink:to="OtherInflowsOutflowsOfCashClassifiedAsOperatingActivities" xlink:title="presentation: CashFlowsFromUsedInOperatingActivities to OtherInflowsOutflowsOfCashClassifiedAsOperatingActivities" order="5.0"/>
    <link:loc xlink:type="locator" xlink:href="ovs-2022-01-31.xsd#ovs_RealisedForeignExchangeDifferencesAndCashFlowsFromCurrencyDerivatives" xlink:label="RealisedForeignExchangeDifferencesAndCashFlowsFromCurrencyDerivatives" xlink:title="RealisedForeignExchangeDifferencesAndCashFlowsFromCurrencyDerivatives"/>
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="CashFlowsFromUsedInOperatingActivities" xlink:to="RealisedForeignExchangeDifferencesAndCashFlowsFromCurrencyDerivatives" xlink:title="presentation: CashFlowsFromUsedInOperatingActivities to RealisedForeignExchangeDifferencesAndCashFlowsFromCurrencyDerivatives" order="4.0"/>
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_CashFlowsFromUsedInInvestingActivities" xlink:label="CashFlowsFromUsedInInvestingActivities" xlink:title="CashFlowsFromUsedInInvestingActivities"/>
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="IncreaseDecreaseInCashAndCashEquivalents" xlink:to="CashFlowsFromUsedInInvestingActivities" xlink:title="presentation: IncreaseDecreaseInCashAndCashEquivalents to CashFlowsFromUsedInInvestingActivities" order="2.0"/>
    <link:loc xlink:type="locator" xlink:href="ovs-2022-01-31.xsd#ovs_PurchaseOfPpeAndIntangibleAssetsClassifiedAsInvestingActivities" xlink:label="PurchaseOfPPEAndIntangibleAssetsClassifiedAsInvestingActivities" xlink:title="PurchaseOfPPEAndIntangibleAssetsClassifiedAsInvestingActivities"/>
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="CashFlowsFromUsedInInvestingActivities" xlink:to="PurchaseOfPPEAndIntangibleAssetsClassifiedAsInvestingActivities" xlink:title="presentation: CashFlowsFromUsedInInvestingActivities to PurchaseOfPPEAndIntangibleAssetsClassifiedAsInvestingActivities" order="1.0"/>
    <link:loc xlink:type="locator" xlink:href="ovs-2022-01-31.xsd#ovs_ProceedsFromSalesOfPpeAndIntangibleAssetsClassifiedAsInvestingActivities" xlink:label="ProceedsFromSalesOfPPEAndIntangibleAssetsClassifiedAsInvestingActivities" xlink:title="ProceedsFromSalesOfPPEAndIntangibleAssetsClassifiedAsInvestingActivities"/>
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="CashFlowsFromUsedInInvestingActivities" xlink:to="ProceedsFromSalesOfPPEAndIntangibleAssetsClassifiedAsInvestingActivities" xlink:title="presentation: CashFlowsFromUsedInInvestingActivities to ProceedsFromSalesOfPPEAndIntangibleAssetsClassifiedAsInvestingActivities" order="2.0"/>
    <link:loc xlink:type="locator" xlink:href="ovs-2022-01-31.xsd#ovs_IncreaseDecreaseInEquityInvestments" xlink:label="IncreaseDecreaseInEquityInvestments" xlink:title="IncreaseDecreaseInEquityInvestments"/>
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="CashFlowsFromUsedInInvestingActivities" xlink:to="IncreaseDecreaseInEquityInvestments" xlink:title="presentation: CashFlowsFromUsedInInvestingActivities to IncreaseDecreaseInEquityInvestments" order="3.0"/>
    <link:loc xlink:type="locator" xlink:href="ovs-2022-01-31.xsd#ovs_CashOutDueToBusinessCombinationDuringThePeriod" xlink:label="CashOutDueToBusinessCombinationDuringThePeriod" xlink:title="CashOutDueToBusinessCombinationDuringThePeriod"/>
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="CashFlowsFromUsedInInvestingActivities" xlink:to="CashOutDueToBusinessCombinationDuringThePeriod" xlink:title="presentation: CashFlowsFromUsedInInvestingActivities to CashOutDueToBusinessCombinationDuringThePeriod" order="4.0"/>
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_CashFlowsFromUsedInFinancingActivities" xlink:label="CashFlowsFromUsedInFinancingActivities" xlink:title="CashFlowsFromUsedInFinancingActivities"/>
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="IncreaseDecreaseInCashAndCashEquivalents" xlink:to="CashFlowsFromUsedInFinancingActivities" xlink:title="presentation: IncreaseDecreaseInCashAndCashEquivalents to CashFlowsFromUsedInFinancingActivities" order="4.0"/>
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_PaymentsToAcquireOrRedeemEntitysShares" xlink:label="PaymentsToAcquireOrRedeemEntitysShares" xlink:title="PaymentsToAcquireOrRedeemEntitysShares"/>
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="CashFlowsFromUsedInFinancingActivities" xlink:to="PaymentsToAcquireOrRedeemEntitysShares" xlink:title="presentation: CashFlowsFromUsedInFinancingActivities to PaymentsToAcquireOrRedeemEntitysShares" order="3.0" preferredLabel="http://www.xbrl.org/2009/role/negatedLabel"/>
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_ProceedsFromIssuingShares" xlink:label="ProceedsFromIssuingShares" xlink:title="ProceedsFromIssuingShares"/>
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="CashFlowsFromUsedInFinancingActivities" xlink:to="ProceedsFromIssuingShares" xlink:title="presentation: CashFlowsFromUsedInFinancingActivities to ProceedsFromIssuingShares" order="4.0"/>
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_DividendsPaidClassifiedAsFinancingActivities" xlink:label="DividendsPaidClassifiedAsFinancingActivities" xlink:title="DividendsPaidClassifiedAsFinancingActivities"/>
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="CashFlowsFromUsedInFinancingActivities" xlink:to="DividendsPaidClassifiedAsFinancingActivities" xlink:title="presentation: CashFlowsFromUsedInFinancingActivities to DividendsPaidClassifiedAsFinancingActivities" order="5.0" preferredLabel="http://www.xbrl.org/2009/role/negatedTerseLabel"/>
    <link:loc xlink:type="locator" xlink:href="ovs-2022-01-31.xsd#ovs_NetChangeInFinancialAssetsAndLiabilities" xlink:label="NetChangeInFinancialAssetsAndLiabilities" xlink:title="NetChangeInFinancialAssetsAndLiabilities"/>
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="CashFlowsFromUsedInFinancingActivities" xlink:to="NetChangeInFinancialAssetsAndLiabilities" xlink:title="presentation: CashFlowsFromUsedInFinancingActivities to NetChangeInFinancialAssetsAndLiabilities" order="1.0"/>
    <link:loc xlink:type="locator" xlink:href="ovs-2022-01-31.xsd#ovs_RepaymentOfLeaseLiabilitiesCollectionOfAssetsForLeases" xlink:label="RepaymentOfLeaseLiabilitiesCollectionOfAssetsForLeases" xlink:title="RepaymentOfLeaseLiabilitiesCollectionOfAssetsForLeases"/>
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="CashFlowsFromUsedInFinancingActivities" xlink:to="RepaymentOfLeaseLiabilitiesCollectionOfAssetsForLeases" xlink:title="presentation: CashFlowsFromUsedInFinancingActivities to RepaymentOfLeaseLiabilitiesCollectionOfAssetsForLeases" order="2.0"/>
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_CashAndCashEquivalents" xlink:label="ifrs-full_CashAndCashEquivalents" xlink:title="CashAndCashEquivalents"/>
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="StatementOfCashFlowsAbstract" xlink:to="ifrs-full_CashAndCashEquivalents" order="3.0" preferredLabel="http://www.xbrl.org/2003/role/periodStartLabel"/>
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_CashAndCashEquivalents" xlink:label="ifrs-full_CashAndCashEquivalents_2"/>
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="StatementOfCashFlowsAbstract" xlink:to="ifrs-full_CashAndCashEquivalents_2" order="4.0" preferredLabel="http://www.xbrl.org/2003/role/periodEndLabel"/>
  </link:presentationLink>
  <link:presentationLink xlink:type="extended" xlink:role="http://www.ovs.it/role/StatementConsolidatedStatementsOfChangesInEquity">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_StatementOfChangesInEquityAbstract" xlink:label="StatementOfChangesInEquityAbstract" xlink:title="StatementOfChangesInEquityAbstract"/>
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_StatementOfChangesInEquityTable" xlink:label="StatementOfChangesInEquityTable" xlink:title="StatementOfChangesInEquityTable"/>
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="StatementOfChangesInEquityAbstract" xlink:to="StatementOfChangesInEquityTable" xlink:title="presentation: StatementOfChangesInEquityAbstract to StatementOfChangesInEquityTable" order="1.0"/>
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_ComponentsOfEquityAxis" xlink:label="ComponentsOfEquityAxis" xlink:title="ComponentsOfEquityAxis"/>
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="StatementOfChangesInEquityTable" xlink:to="ComponentsOfEquityAxis" xlink:title="presentation: StatementOfChangesInEquityTable to ComponentsOfEquityAxis" order="1.0"/>
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_EquityMember" xlink:label="EquityMember" xlink:title="EquityMember"/>
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="ComponentsOfEquityAxis" xlink:to="EquityMember" xlink:title="presentation: ComponentsOfEquityAxis to EquityMember" order="1.0"/>
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_EquityAttributableToOwnersOfParentMember" xlink:label="EquityAttributableToOwnersOfParentMember" xlink:title="EquityAttributableToOwnersOfParentMember"/>
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="EquityMember" xlink:to="EquityAttributableToOwnersOfParentMember" xlink:title="presentation: EquityMember to EquityAttributableToOwnersOfParentMember" order="1.0"/>
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_IssuedCapitalMember" xlink:label="IssuedCapitalMember" xlink:title="IssuedCapitalMember"/>
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="EquityAttributableToOwnersOfParentMember" xlink:to="IssuedCapitalMember" xlink:title="presentation: EquityAttributableToOwnersOfParentMember to IssuedCapitalMember" order="1.0"/>
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_SharePremiumMember" xlink:label="SharePremiumMember" xlink:title="SharePremiumMember"/>
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="EquityAttributableToOwnersOfParentMember" xlink:to="SharePremiumMember" xlink:title="presentation: EquityAttributableToOwnersOfParentMember to SharePremiumMember" order="2.0"/>
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_StatutoryReserveMember" xlink:label="StatutoryReserveMember" xlink:title="StatutoryReserveMember"/>
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="EquityAttributableToOwnersOfParentMember" xlink:to="StatutoryReserveMember" xlink:title="presentation: EquityAttributableToOwnersOfParentMember to StatutoryReserveMember" order="3.0"/>
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_TreasurySharesMember" xlink:label="TreasurySharesMember" xlink:title="TreasurySharesMember"/>
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="EquityAttributableToOwnersOfParentMember" xlink:to="TreasurySharesMember" xlink:title="presentation: EquityAttributableToOwnersOfParentMember to TreasurySharesMember" order="4.0"/>
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_ReserveOfRemeasurementsOfDefinedBenefitPlansMember" xlink:label="ReserveOfRemeasurementsOfDefinedBenefitPlansMember" xlink:title="ReserveOfRemeasurementsOfDefinedBenefitPlansMember"/>
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="EquityAttributableToOwnersOfParentMember" xlink:to="ReserveOfRemeasurementsOfDefinedBenefitPlansMember" xlink:title="presentation: EquityAttributableToOwnersOfParentMember to ReserveOfRemeasurementsOfDefinedBenefitPlansMember" order="5.0"/>
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_ReserveOfExchangeDifferencesOnTranslationMember" xlink:label="ReserveOfExchangeDifferencesOnTranslationMember" xlink:title="ReserveOfExchangeDifferencesOnTranslationMember"/>
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="EquityAttributableToOwnersOfParentMember" xlink:to="ReserveOfExchangeDifferencesOnTranslationMember" xlink:title="presentation: EquityAttributableToOwnersOfParentMember to ReserveOfExchangeDifferencesOnTranslationMember" order="6.0"/>
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_ReserveOfSharebasedPaymentsMember" xlink:label="ReserveOfSharebasedPaymentsMember" xlink:title="ReserveOfSharebasedPaymentsMember"/>
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="EquityAttributableToOwnersOfParentMember" xlink:to="ReserveOfSharebasedPaymentsMember" xlink:title="presentation: EquityAttributableToOwnersOfParentMember to ReserveOfSharebasedPaymentsMember" order="7.0"/>
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_OtherReservesMember" xlink:label="OtherReservesMember" xlink:title="OtherReservesMember"/>
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="EquityAttributableToOwnersOfParentMember" xlink:to="OtherReservesMember" xlink:title="presentation: EquityAttributableToOwnersOfParentMember to OtherReservesMember" order="8.0"/>
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_RetainedEarningsMember" xlink:label="RetainedEarningsMember" xlink:title="RetainedEarningsMember"/>
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="EquityAttributableToOwnersOfParentMember" xlink:to="RetainedEarningsMember" xlink:title="presentation: EquityAttributableToOwnersOfParentMember to RetainedEarningsMember" order="9.0"/>
    <link:loc xlink:type="locator" xlink:href="ovs-2022-01-31.xsd#ovs_ProfitLossAttributableToOwnersOfParentMember" xlink:label="ProfitLossAttributableToOwnersParentMember" xlink:title="ProfitLossAttributableToOwnersParentMember"/>
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="EquityAttributableToOwnersOfParentMember" xlink:to="ProfitLossAttributableToOwnersParentMember" xlink:title="presentation: EquityAttributableToOwnersOfParentMember to ProfitLossAttributableToOwnersParentMember" order="10.0"/>
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_NoncontrollingInterestsMember" xlink:label="NoncontrollingInterestsMember" xlink:title="NoncontrollingInterestsMember"/>
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="EquityMember" xlink:to="NoncontrollingInterestsMember" xlink:title="presentation: EquityMember to NoncontrollingInterestsMember" order="2.0"/>
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_StatementOfChangesInEquityLineItems" xlink:label="StatementOfChangesInEquityLineItems" xlink:title="StatementOfChangesInEquityLineItems"/>
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="StatementOfChangesInEquityTable" xlink:to="StatementOfChangesInEquityLineItems" xlink:title="presentation: StatementOfChangesInEquityTable to StatementOfChangesInEquityLineItems" order="2.0"/>
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_Equity" xlink:label="Equity_2" xlink:title="Equity"/>
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="StatementOfChangesInEquityLineItems" xlink:to="Equity_2" xlink:title="presentation: StatementOfChangesInEquityLineItems to Equity" order="1.0" preferredLabel="http://www.xbrl.org/2003/role/periodStartLabel"/>
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_Equity" xlink:label="Equity" xlink:title="Equity"/>
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="StatementOfChangesInEquityLineItems" xlink:to="Equity" xlink:title="presentation: StatementOfChangesInEquityLineItems to Equity" order="9.0" preferredLabel="http://www.xbrl.org/2003/role/periodEndLabel"/>
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_IncreaseDecreaseThroughAppropriationOfRetainedEarnings" xlink:label="IncreaseDecreaseThroughAppropriationOfRetainedEarnings" xlink:title="IncreaseDecreaseThroughAppropriationOfRetainedEarnings"/>
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="StatementOfChangesInEquityLineItems" xlink:to="IncreaseDecreaseThroughAppropriationOfRetainedEarnings" xlink:title="presentation: StatementOfChangesInEquityLineItems to IncreaseDecreaseThroughAppropriationOfRetainedEarnings" order="2.0"/>
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_IncreaseDecreaseThroughSharebasedPaymentTransactions" xlink:label="IncreaseDecreaseThroughSharebasedPaymentTransactions" xlink:title="IncreaseDecreaseThroughSharebasedPaymentTransactions"/>
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="StatementOfChangesInEquityLineItems" xlink:to="IncreaseDecreaseThroughSharebasedPaymentTransactions" xlink:title="presentation: StatementOfChangesInEquityLineItems to IncreaseDecreaseThroughSharebasedPaymentTransactions" order="3.0"/>
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_IssueOfEquity" xlink:label="IssueOfEquity" xlink:title="IssueOfEquity"/>
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="StatementOfChangesInEquityLineItems" xlink:to="IssueOfEquity" xlink:title="presentation: StatementOfChangesInEquityLineItems to IssueOfEquity" order="4.0"/>
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_IncreaseDecreaseThroughTransactionsWithOwners" xlink:label="IncreaseDecreaseThroughTransactionsWithOwners" xlink:title="IncreaseDecreaseThroughTransactionsWithOwners"/>
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="StatementOfChangesInEquityLineItems" xlink:to="IncreaseDecreaseThroughTransactionsWithOwners" xlink:title="presentation: StatementOfChangesInEquityLineItems to IncreaseDecreaseThroughTransactionsWithOwners" order="5.0"/>
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_ProfitLoss" xlink:label="ProfitLoss" xlink:title="ProfitLoss"/>
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="StatementOfChangesInEquityLineItems" xlink:to="ProfitLoss" xlink:title="presentation: StatementOfChangesInEquityLineItems to ProfitLoss" order="6.0"/>
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_OtherComprehensiveIncome" xlink:label="OtherComprehensiveIncome" xlink:title="OtherComprehensiveIncome"/>
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="StatementOfChangesInEquityLineItems" xlink:to="OtherComprehensiveIncome" xlink:title="presentation: StatementOfChangesInEquityLineItems to OtherComprehensiveIncome" order="7.0"/>
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_ComprehensiveIncome" xlink:label="ComprehensiveIncome" xlink:title="ComprehensiveIncome"/>
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="StatementOfChangesInEquityLineItems" xlink:to="ComprehensiveIncome" xlink:title="presentation: StatementOfChangesInEquityLineItems to ComprehensiveIncome" order="8.0"/>
  </link:presentationLink>
  <link:presentationLink xlink:type="extended" xlink:role="http://www.ovs.it/role/StatementConsolidatedStatementsOfComprehensiveIncome">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_OtherComprehensiveIncome" xlink:label="ifrs-full_OtherComprehensiveIncome" xlink:title="OtherComprehensiveIncome"/>
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_OtherComprehensiveIncomeThatWillNotBeReclassifiedToProfitOrLossNetOfTax" xlink:label="ifrs-full_OtherComprehensiveIncomeThatWillNotBeReclassifiedToProfitOrLossNetOfTax" xlink:title="OtherComprehensiveIncomeThatWillNotBeReclassifiedToProfitOrLossNetOfTax"/>
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="ifrs-full_OtherComprehensiveIncome" xlink:to="ifrs-full_OtherComprehensiveIncomeThatWillNotBeReclassifiedToProfitOrLossNetOfTax" order="1.0"/>
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_OtherComprehensiveIncomeNetOfTaxGainsLossesFromInvestmentsInEquityInstruments" xlink:label="ifrs-full_OtherComprehensiveIncomeNetOfTaxGainsLossesFromInvestmentsInEquityInstruments" xlink:title="OtherComprehensiveIncomeNetOfTaxGainsLossesFromInvestmentsInEquityInstruments"/>
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="ifrs-full_OtherComprehensiveIncomeThatWillNotBeReclassifiedToProfitOrLossNetOfTax" xlink:to="ifrs-full_OtherComprehensiveIncomeNetOfTaxGainsLossesFromInvestmentsInEquityInstruments" order="1.0"/>
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_OtherComprehensiveIncomeBeforeTaxGainsLossesOnRemeasurementsOfDefinedBenefitPlans" xlink:label="ifrs-full_OtherComprehensiveIncomeBeforeTaxGainsLossesOnRemeasurementsOfDefinedBenefitPlans" xlink:title="OtherComprehensiveIncomeBeforeTaxGainsLossesOnRemeasurementsOfDefinedBenefitPlans"/>
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="ifrs-full_OtherComprehensiveIncomeThatWillNotBeReclassifiedToProfitOrLossNetOfTax" xlink:to="ifrs-full_OtherComprehensiveIncomeBeforeTaxGainsLossesOnRemeasurementsOfDefinedBenefitPlans" order="2.0"/>
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_IncomeTaxRelatingToRemeasurementsOfDefinedBenefitPlansOfOtherComprehensiveIncome" xlink:label="ifrs-full_IncomeTaxRelatingToRemeasurementsOfDefinedBenefitPlansOfOtherComprehensiveIncome" xlink:title="IncomeTaxRelatingToRemeasurementsOfDefinedBenefitPlansOfOtherComprehensiveIncome"/>
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="ifrs-full_OtherComprehensiveIncomeThatWillNotBeReclassifiedToProfitOrLossNetOfTax" xlink:to="ifrs-full_IncomeTaxRelatingToRemeasurementsOfDefinedBenefitPlansOfOtherComprehensiveIncome" order="3.0" preferredLabel="http://www.xbrl.org/2009/role/negatedLabel"/>
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_OtherComprehensiveIncomeThatWillBeReclassifiedToProfitOrLossNetOfTax" xlink:label="ifrs-full_OtherComprehensiveIncomeThatWillBeReclassifiedToProfitOrLossNetOfTax" xlink:title="OtherComprehensiveIncomeThatWillBeReclassifiedToProfitOrLossNetOfTax"/>
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="ifrs-full_OtherComprehensiveIncome" xlink:to="ifrs-full_OtherComprehensiveIncomeThatWillBeReclassifiedToProfitOrLossNetOfTax" order="2.0"/>
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_GainsLossesOnExchangeDifferencesOnTranslationNetOfTax" xlink:label="ifrs-full_GainsLossesOnExchangeDifferencesOnTranslationNetOfTax" xlink:title="GainsLossesOnExchangeDifferencesOnTranslationNetOfTax"/>
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="ifrs-full_OtherComprehensiveIncomeThatWillBeReclassifiedToProfitOrLossNetOfTax" xlink:to="ifrs-full_GainsLossesOnExchangeDifferencesOnTranslationNetOfTax" order="1.0"/>
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_ComprehensiveIncome" xlink:label="ifrs-full_ComprehensiveIncome" xlink:title="ComprehensiveIncome"/>
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_ProfitLoss" xlink:label="ifrs-full_ProfitLoss" xlink:title="ProfitLoss"/>
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="ifrs-full_ComprehensiveIncome" xlink:to="ifrs-full_ProfitLoss" order="1.0"/>
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="ifrs-full_ComprehensiveIncome" xlink:to="ifrs-full_OtherComprehensiveIncome" order="2.0"/>
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_StatementOfComprehensiveIncomeAbstract" xlink:label="ifrs-full_StatementOfComprehensiveIncomeAbstract"/>
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="ifrs-full_StatementOfComprehensiveIncomeAbstract" xlink:to="ifrs-full_ComprehensiveIncome" order="1.0"/>
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_ComprehensiveIncomeAttributableToOwnersOfParent" xlink:label="ifrs-full_ComprehensiveIncomeAttributableToOwnersOfParent" xlink:title="ComprehensiveIncomeAttributableToOwnersOfParent"/>
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="ifrs-full_StatementOfComprehensiveIncomeAbstract" xlink:to="ifrs-full_ComprehensiveIncomeAttributableToOwnersOfParent" order="2.0"/>
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_ComprehensiveIncomeAttributableToNoncontrollingInterests" xlink:label="ifrs-full_ComprehensiveIncomeAttributableToNoncontrollingInterests" xlink:title="ComprehensiveIncomeAttributableToNoncontrollingInterests"/>
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="ifrs-full_StatementOfComprehensiveIncomeAbstract" xlink:to="ifrs-full_ComprehensiveIncomeAttributableToNoncontrollingInterests" order="3.0"/>
  </link:presentationLink>
  <link:presentationLink xlink:type="extended" xlink:role="http://www.ovs.it/role/StatementConsolidatedStatementsOfFinancialPosition">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_Equity" xlink:label="Equity" xlink:title="Equity"/>
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_EquityAttributableToOwnersOfParent" xlink:label="EquityAttributableToOwnersOfParent" xlink:title="EquityAttributableToOwnersOfParent"/>
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="Equity" xlink:to="EquityAttributableToOwnersOfParent" xlink:title="presentation: Equity to EquityAttributableToOwnersOfParent" order="1.0"/>
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_IssuedCapital" xlink:label="IssuedCapital" xlink:title="IssuedCapital"/>
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="EquityAttributableToOwnersOfParent" xlink:to="IssuedCapital" xlink:title="presentation: EquityAttributableToOwnersOfParent to IssuedCapital" order="1.0"/>
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_TreasuryShares" xlink:label="TreasuryShares" xlink:title="TreasuryShares"/>
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="EquityAttributableToOwnersOfParent" xlink:to="TreasuryShares" xlink:title="presentation: EquityAttributableToOwnersOfParent to TreasuryShares" order="2.0" preferredLabel="http://www.xbrl.org/2009/role/negatedLabel"/>
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_OtherReserves" xlink:label="OtherReserves" xlink:title="OtherReserves"/>
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="EquityAttributableToOwnersOfParent" xlink:to="OtherReserves" xlink:title="presentation: EquityAttributableToOwnersOfParent to OtherReserves" order="3.0"/>
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_RetainedEarnings" xlink:label="RetainedEarnings" xlink:title="RetainedEarnings"/>
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="EquityAttributableToOwnersOfParent" xlink:to="RetainedEarnings" xlink:title="presentation: EquityAttributableToOwnersOfParent to RetainedEarnings" order="4.0"/>
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_NoncontrollingInterests" xlink:label="NoncontrollingInterests" xlink:title="NoncontrollingInterests"/>
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="Equity" xlink:to="NoncontrollingInterests" xlink:title="presentation: Equity to NoncontrollingInterests" order="6.0"/>
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_StatementOfFinancialPositionAbstract" xlink:label="ifrs-full_StatementOfFinancialPositionAbstract"/>
    <link:loc xlink:type="locator" xlink:href="ovs-2022-01-31.xsd#ovs_StatementOfFinancialPositionTable" xlink:label="ovs_StatementOfFinancialPositionTable"/>
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="ifrs-full_StatementOfFinancialPositionAbstract" xlink:to="ovs_StatementOfFinancialPositionTable" order="1.0"/>
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_CategoriesOfRelatedPartiesAxis" xlink:label="ifrs-full_CategoriesOfRelatedPartiesAxis"/>
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="ovs_StatementOfFinancialPositionTable" xlink:to="ifrs-full_CategoriesOfRelatedPartiesAxis" order="1.0"/>
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_EntitysTotalForRelatedPartiesMember" xlink:label="ifrs-full_EntitysTotalForRelatedPartiesMember"/>
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="ifrs-full_CategoriesOfRelatedPartiesAxis" xlink:to="ifrs-full_EntitysTotalForRelatedPartiesMember" order="1.0"/>
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_RelatedPartiesMember" xlink:label="ifrs-full_RelatedPartiesMember"/>
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="ifrs-full_EntitysTotalForRelatedPartiesMember" xlink:to="ifrs-full_RelatedPartiesMember" order="1.0"/>
    <link:loc xlink:type="locator" xlink:href="ovs-2022-01-31.xsd#ovs_StatementOfFinancialPositionLineItems" xlink:label="ovs_StatementOfFinancilaPositionLineItems"/>
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="ovs_StatementOfFinancialPositionTable" xlink:to="ovs_StatementOfFinancilaPositionLineItems" xlink:title="presentation: StatementOfFinancialPositionTable to StatementOfFinancialPositionLineItems" order="2.0"/>
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_Assets" xlink:label="ifrs-full_Assets"/>
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="ovs_StatementOfFinancilaPositionLineItems" xlink:to="ifrs-full_Assets" order="1.0"/>
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_CurrentAssets" xlink:label="ifrs-full_CurrentAssets"/>
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="ifrs-full_Assets" xlink:to="ifrs-full_CurrentAssets" order="1.0"/>
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_CashAndCashEquivalents" xlink:label="ifrs-full_CashAndCashEquivalents"/>
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="ifrs-full_CurrentAssets" xlink:to="ifrs-full_CashAndCashEquivalents" order="1.0"/>
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_CurrentTradeReceivables" xlink:label="ifrs-full_CurrentTradeReceivables"/>
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="ifrs-full_CurrentAssets" xlink:to="ifrs-full_CurrentTradeReceivables" order="2.0"/>
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_Inventories" xlink:label="ifrs-full_Inventories"/>
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="ifrs-full_CurrentAssets" xlink:to="ifrs-full_Inventories" order="3.0"/>
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_OtherCurrentFinancialAssets" xlink:label="OtherCurrentFinancialAssets" xlink:title="OtherCurrentFinancialAssets"/>
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="ifrs-full_CurrentAssets" xlink:to="OtherCurrentFinancialAssets" xlink:title="presentation: CurrentAssets to OtherCurrentFinancialAssets" order="4.0"/>
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_CurrentFinanceLeaseReceivables" xlink:label="CurrentFinanceLeaseReceivables" xlink:title="CurrentFinanceLeaseReceivables"/>
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="ifrs-full_CurrentAssets" xlink:to="CurrentFinanceLeaseReceivables" xlink:title="presentation: CurrentAssets to CurrentFinanceLeaseReceivables" order="5.0"/>
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_CurrentTaxAssetsCurrent" xlink:label="CurrentTaxAssetsCurrent" xlink:title="CurrentTaxAssetsCurrent"/>
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="ifrs-full_CurrentAssets" xlink:to="CurrentTaxAssetsCurrent" xlink:title="presentation: CurrentAssets to CurrentTaxAssetsCurrent" order="6.0"/>
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_OtherCurrentAssets" xlink:label="OtherCurrentAssets" xlink:title="OtherCurrentAssets"/>
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="ifrs-full_CurrentAssets" xlink:to="OtherCurrentAssets" xlink:title="presentation: CurrentAssets to OtherCurrentAssets" order="7.0"/>
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_NoncurrentAssets" xlink:label="ifrs-full_NoncurrentAssets"/>
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="ifrs-full_Assets" xlink:to="ifrs-full_NoncurrentAssets" order="2.0"/>
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_PropertyPlantAndEquipment" xlink:label="PropertyPlantAndEquipment" xlink:title="PropertyPlantAndEquipment"/>
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="ifrs-full_NoncurrentAssets" xlink:to="PropertyPlantAndEquipment" xlink:title="presentation: NoncurrentAssets to PropertyPlantAndEquipment" order="1.0"/>
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_RightofuseAssets" xlink:label="RightofuseAssets" xlink:title="RightofuseAssets"/>
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="ifrs-full_NoncurrentAssets" xlink:to="RightofuseAssets" xlink:title="presentation: NoncurrentAssets to RightofuseAssets" order="2.0"/>
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_IntangibleAssetsOtherThanGoodwill" xlink:label="IntangibleAssetsOtherThanGoodwill" xlink:title="IntangibleAssetsOtherThanGoodwill"/>
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="ifrs-full_NoncurrentAssets" xlink:to="IntangibleAssetsOtherThanGoodwill" xlink:title="presentation: NoncurrentAssets to IntangibleAssetsOtherThanGoodwill" order="3.0"/>
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_Goodwill" xlink:label="Goodwill" xlink:title="Goodwill"/>
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="ifrs-full_NoncurrentAssets" xlink:to="Goodwill" xlink:title="presentation: NoncurrentAssets to Goodwill" order="4.0"/>
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_InvestmentsInSubsidiariesJointVenturesAndAssociates" xlink:label="InvestmentsInSubsidiariesJointVenturesAndAssociates" xlink:title="InvestmentsInSubsidiariesJointVenturesAndAssociates"/>
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="ifrs-full_NoncurrentAssets" xlink:to="InvestmentsInSubsidiariesJointVenturesAndAssociates" xlink:title="presentation: NoncurrentAssets to InvestmentsInSubsidiariesJointVenturesAndAssociates" order="5.0"/>
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_OtherNoncurrentFinancialAssets" xlink:label="OtherNoncurrentFinancialAssets" xlink:title="OtherNoncurrentFinancialAssets"/>
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="ifrs-full_NoncurrentAssets" xlink:to="OtherNoncurrentFinancialAssets" xlink:title="presentation: NoncurrentAssets to OtherNoncurrentFinancialAssets" order="6.0"/>
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_NoncurrentFinanceLeaseReceivables" xlink:label="NoncurrentFinanceLeaseReceivables" xlink:title="NoncurrentFinanceLeaseReceivables"/>
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="ifrs-full_NoncurrentAssets" xlink:to="NoncurrentFinanceLeaseReceivables" xlink:title="presentation: NoncurrentAssets to NoncurrentFinanceLeaseReceivables" order="7.0"/>
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_OtherNoncurrentAssets" xlink:label="OtherNoncurrentAssets" xlink:title="OtherNoncurrentAssets"/>
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="ifrs-full_NoncurrentAssets" xlink:to="OtherNoncurrentAssets" xlink:title="presentation: NoncurrentAssets to OtherNoncurrentAssets" order="9.0"/>
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_EquityAndLiabilities" xlink:label="EquityAndLiabilities" xlink:title="EquityAndLiabilities"/>
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="ovs_StatementOfFinancilaPositionLineItems" xlink:to="EquityAndLiabilities" xlink:title="presentation: StatementOfFinancialPositionLineItems to EquityAndLiabilities" order="3.0"/>
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="EquityAndLiabilities" xlink:to="Equity" xlink:title="presentation: EquityAndLiabilities to Equity" order="2.0"/>
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_Liabilities" xlink:label="Liabilities" xlink:title="Liabilities"/>
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="EquityAndLiabilities" xlink:to="Liabilities" xlink:title="presentation: EquityAndLiabilities to Liabilities" order="1.0"/>
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_CurrentLiabilities" xlink:label="CurrentLiabilities" xlink:title="CurrentLiabilities"/>
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="Liabilities" xlink:to="CurrentLiabilities" xlink:title="presentation: Liabilities to CurrentLiabilities" order="1.0"/>
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_CurrentFinancialLiabilities" xlink:label="CurrentFinancialLiabilities" xlink:title="CurrentFinancialLiabilities"/>
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="CurrentLiabilities" xlink:to="CurrentFinancialLiabilities" xlink:title="presentation: CurrentLiabilities to CurrentFinancialLiabilities" order="1.0"/>
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_CurrentLeaseLiabilities" xlink:label="CurrentLeaseLiabilities" xlink:title="CurrentLeaseLiabilities"/>
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="CurrentLiabilities" xlink:to="CurrentLeaseLiabilities" xlink:title="presentation: CurrentLiabilities to CurrentLeaseLiabilities" order="2.0"/>
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_TradeAndOtherCurrentPayablesToTradeSuppliers" xlink:label="TradeAndOtherCurrentPayablesToTradeSuppliers" xlink:title="TradeAndOtherCurrentPayablesToTradeSuppliers"/>
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="CurrentLiabilities" xlink:to="TradeAndOtherCurrentPayablesToTradeSuppliers" xlink:title="presentation: CurrentLiabilities to TradeAndOtherCurrentPayablesToTradeSuppliers" order="3.0"/>
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_CurrentTaxLiabilitiesCurrent" xlink:label="CurrentTaxLiabilitiesCurrent" xlink:title="CurrentTaxLiabilitiesCurrent"/>
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="CurrentLiabilities" xlink:to="CurrentTaxLiabilitiesCurrent" xlink:title="presentation: CurrentLiabilities to CurrentTaxLiabilitiesCurrent" order="4.0"/>
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_OtherCurrentNonfinancialLiabilities" xlink:label="OtherCurrentNonfinancialLiabilities" xlink:title="OtherCurrentNonfinancialLiabilities"/>
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="CurrentLiabilities" xlink:to="OtherCurrentNonfinancialLiabilities" xlink:title="presentation: CurrentLiabilities to OtherCurrentNonfinancialLiabilities" order="5.0"/>
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_NoncurrentLiabilities" xlink:label="NoncurrentLiabilities" xlink:title="NoncurrentLiabilities"/>
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="Liabilities" xlink:to="NoncurrentLiabilities" xlink:title="presentation: Liabilities to NoncurrentLiabilities" order="2.0"/>
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_NoncurrentFinancialLiabilities" xlink:label="NoncurrentFinancialLiabilities" xlink:title="NoncurrentFinancialLiabilities"/>
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="NoncurrentLiabilities" xlink:to="NoncurrentFinancialLiabilities" xlink:title="presentation: NoncurrentLiabilities to NoncurrentFinancialLiabilities" order="1.0"/>
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_NoncurrentLeaseLiabilities" xlink:label="NoncurrentLeaseLiabilities" xlink:title="NoncurrentLeaseLiabilities"/>
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="NoncurrentLiabilities" xlink:to="NoncurrentLeaseLiabilities" xlink:title="presentation: NoncurrentLiabilities to NoncurrentLeaseLiabilities" order="2.0"/>
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_NoncurrentRecognisedLiabilitiesDefinedBenefitPlan" xlink:label="NoncurrentRecognisedLiabilitiesDefinedBenefitPlan" xlink:title="NoncurrentRecognisedLiabilitiesDefinedBenefitPlan"/>
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="NoncurrentLiabilities" xlink:to="NoncurrentRecognisedLiabilitiesDefinedBenefitPlan" xlink:title="presentation: NoncurrentLiabilities to NoncurrentRecognisedLiabilitiesDefinedBenefitPlan" order="3.0"/>
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_OtherLongtermProvisions" xlink:label="OtherLongtermProvisions" xlink:title="OtherLongtermProvisions"/>
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="NoncurrentLiabilities" xlink:to="OtherLongtermProvisions" xlink:title="presentation: NoncurrentLiabilities to OtherLongtermProvisions" order="4.0"/>
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_NetDeferredTaxLiabilities" xlink:label="NetDeferredTaxLiabilities" xlink:title="NetDeferredTaxLiabilities"/>
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="NoncurrentLiabilities" xlink:to="NetDeferredTaxLiabilities" xlink:title="presentation: NoncurrentLiabilities to NetDeferredTaxLiabilities" order="5.0"/>
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_OtherNoncurrentNonfinancialLiabilities" xlink:label="OtherNoncurrentNonfinancialLiabilities" xlink:title="OtherNoncurrentNonfinancialLiabilities"/>
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="NoncurrentLiabilities" xlink:to="OtherNoncurrentNonfinancialLiabilities" xlink:title="presentation: NoncurrentLiabilities to OtherNoncurrentNonfinancialLiabilities" order="6.0"/>
  </link:presentationLink>
  <link:presentationLink xlink:type="extended" xlink:role="http://www.ovs.it/role/StatementConsolidatedIncomeStatement">
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_ProfitLoss" xlink:label="ProfitLoss" xlink:title="ProfitLoss"/>
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_ProfitLossBeforeTax" xlink:label="ProfitLossBeforeTax" xlink:title="ProfitLossBeforeTax"/>
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="ProfitLoss" xlink:to="ProfitLossBeforeTax" order="1.0"/>
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_FinanceIncome" xlink:label="ifrs-full_FinanceIncome" xlink:title="FinanceIncome"/>
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="ProfitLossBeforeTax" xlink:to="ifrs-full_FinanceIncome" order="2.0"/>
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_FinanceCosts" xlink:label="ifrs-full_FinanceCosts" xlink:title="FinanceCosts"/>
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="ProfitLossBeforeTax" xlink:to="ifrs-full_FinanceCosts" order="3.0" preferredLabel="http://www.xbrl.org/2009/role/negatedLabel"/>
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_GainsLossesOnExchangeDifferencesOnTranslationRecognisedInProfitOrLoss" xlink:label="ifrs-full_GainsLossesOnExchangeDifferencesOnTranslationRecognisedInProfitOrLoss" xlink:title="GainsLossesOnExchangeDifferencesOnTranslationRecognisedInProfitOrLoss"/>
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="ProfitLossBeforeTax" xlink:to="ifrs-full_GainsLossesOnExchangeDifferencesOnTranslationRecognisedInProfitOrLoss" order="4.0"/>
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_OtherIncomeExpenseFromSubsidiariesJointlyControlledEntitiesAndAssociates" xlink:label="ifrs-full_OtherIncomeExpenseFromSubsidiariesJointlyControlledEntitiesAndAssociates" xlink:title="OtherIncomeExpenseFromSubsidiariesJointlyControlledEntitiesAndAssociates"/>
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="ProfitLossBeforeTax" xlink:to="ifrs-full_OtherIncomeExpenseFromSubsidiariesJointlyControlledEntitiesAndAssociates" order="5.0"/>
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_ProfitLossFromOperatingActivities" xlink:label="ProfitLossFromOperatingActivities" xlink:title="ProfitLossFromOperatingActivities"/>
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="ProfitLossBeforeTax" xlink:to="ProfitLossFromOperatingActivities" order="1.0"/>
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_CostOfSales" xlink:label="ifrs-full_CostOfSales" xlink:title="CostOfSales"/>
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="ProfitLossFromOperatingActivities" xlink:to="ifrs-full_CostOfSales" order="2.0" preferredLabel="http://www.xbrl.org/2009/role/negatedLabel"/>
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_EmployeeBenefitsExpense" xlink:label="ifrs-full_EmployeeBenefitsExpense" xlink:title="EmployeeBenefitsExpense"/>
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="ProfitLossFromOperatingActivities" xlink:to="ifrs-full_EmployeeBenefitsExpense" order="3.0" preferredLabel="http://www.xbrl.org/2009/role/negatedLabel"/>
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_DepreciationAndAmortisationExpense" xlink:label="ifrs-full_DepreciationAndAmortisationExpense" xlink:title="DepreciationAndAmortisationExpense"/>
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="ProfitLossFromOperatingActivities" xlink:to="ifrs-full_DepreciationAndAmortisationExpense" order="4.0" preferredLabel="http://www.xbrl.org/2009/role/negatedLabel"/>
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_ServicesExpense" xlink:label="ifrs-full_ServicesExpense" xlink:title="ServicesExpense"/>
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="ProfitLossFromOperatingActivities" xlink:to="ifrs-full_ServicesExpense" order="5.0" preferredLabel="http://www.xbrl.org/2009/role/negatedLabel"/>
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_RentalExpense" xlink:label="ifrs-full_RentalExpense" xlink:title="RentalExpense"/>
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="ProfitLossFromOperatingActivities" xlink:to="ifrs-full_RentalExpense" order="6.0" preferredLabel="http://www.xbrl.org/2009/role/negatedLabel"/>
    <link:loc xlink:type="locator" xlink:href="ovs-2022-01-31.xsd#ovs_ImpairmentLossesAndProvisionsForRisksAndCharges" xlink:label="ovs_ImpairmentLossesAndProvisionsForRisksAndCharges" xlink:title="ImpairmentLossesAndProvisionsForRisksAndCharges"/>
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="ProfitLossFromOperatingActivities" xlink:to="ovs_ImpairmentLossesAndProvisionsForRisksAndCharges" order="7.0"/>
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_MiscellaneousOtherOperatingExpense" xlink:label="ifrs-full_MiscellaneousOtherOperatingExpense" xlink:title="MiscellaneousOtherOperatingExpense"/>
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="ProfitLossFromOperatingActivities" xlink:to="ifrs-full_MiscellaneousOtherOperatingExpense" order="8.0" preferredLabel="http://www.xbrl.org/2009/role/negatedLabel"/>
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_Revenue" xlink:label="Revenue" xlink:title="Revenue"/>
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="ProfitLossFromOperatingActivities" xlink:to="Revenue" xlink:title="presentation: ProfitLossFromOperatingActivities to Revenue" order="1.0"/>
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_OtherIncome" xlink:label="OtherIncome" xlink:title="OtherIncome"/>
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="Revenue" xlink:to="OtherIncome" xlink:title="presentation: Revenue to OtherIncome" order="2.0"/>
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_RevenueFromContractsWithCustomers" xlink:label="RevenueFromContractsWithCustomers" xlink:title="RevenueFromContractsWithCustomers"/>
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="Revenue" xlink:to="RevenueFromContractsWithCustomers" xlink:title="presentation: Revenue to RevenueFromContractsWithCustomers" order="1.0"/>
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_IncomeTaxExpenseContinuingOperations" xlink:label="ifrs-full_IncomeTaxExpenseContinuingOperations" xlink:title="IncomeTaxExpenseContinuingOperations"/>
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="ProfitLoss" xlink:to="ifrs-full_IncomeTaxExpenseContinuingOperations" order="2.0" preferredLabel="http://www.xbrl.org/2009/role/negatedTerseLabel"/>
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_CategoriesOfRelatedPartiesAxis" xlink:label="CategoriesOfRelatedPartiesAxis"/>
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_EntitysTotalForRelatedPartiesMember" xlink:label="EntitysTotalForRelatedPartiesMember"/>
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="CategoriesOfRelatedPartiesAxis" xlink:to="EntitysTotalForRelatedPartiesMember" xlink:title="presentation: CategoriesOfRelatedPartiesAxis to EntitysTotalForRelatedPartiesMember" order="1.0"/>
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_RelatedPartiesMember" xlink:label="RelatedPartiesMember"/>
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="EntitysTotalForRelatedPartiesMember" xlink:to="RelatedPartiesMember" xlink:title="presentation: EntitysTotalForRelatedPartiesMember to RelatedPartiesMember" order="1.0"/>
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_ProfitLossAbstract" xlink:label="ProfitLossAbstract" xlink:title="ProfitLossAbstract"/>
    <link:loc xlink:type="locator" xlink:href="ovs-2022-01-31.xsd#ovs_StatementOfIncomeStatementTable" xlink:label="StatementOfIncomeStatementTable" xlink:title="StatementOfIncomeStatementTable"/>
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="ProfitLossAbstract" xlink:to="StatementOfIncomeStatementTable" xlink:title="presentation: ProfitLossAbstract to StatementOfIncomeStatementTable" order="1.0"/>
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="StatementOfIncomeStatementTable" xlink:to="CategoriesOfRelatedPartiesAxis" xlink:title="presentation: StatementOfIncomeStatementTable to CategoriesOfRelatedPartiesAxis" order="1.0"/>
    <link:loc xlink:type="locator" xlink:href="ovs-2022-01-31.xsd#ovs_StatementOfIncomeStatementLineItems" xlink:label="StatementOfIncomeStatementLineItems" xlink:title="StatementOfIncomeStatementLineItems"/>
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="StatementOfIncomeStatementTable" xlink:to="StatementOfIncomeStatementLineItems" xlink:title="presentation: StatementOfIncomeStatementTable to StatementOfIncomeStatementLineItems" order="2.0"/>
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="StatementOfIncomeStatementLineItems" xlink:to="ProfitLoss" xlink:title="presentation: StatementOfIncomeStatementLineItems to ProfitLoss" order="17.0"/>
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_ProfitLossAttributableToOwnersOfParent" xlink:label="ProfitLossAttributableToOwnersOfParent" xlink:title="ProfitLossAttributableToOwnersOfParent"/>
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="StatementOfIncomeStatementLineItems" xlink:to="ProfitLossAttributableToOwnersOfParent" xlink:title="presentation: StatementOfIncomeStatementLineItems to ProfitLossAttributableToOwnersOfParent" order="18.0"/>
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_ProfitLossAttributableToNoncontrollingInterests" xlink:label="ProfitLossAttributableToNoncontrollingInterests" xlink:title="ProfitLossAttributableToNoncontrollingInterests"/>
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="StatementOfIncomeStatementLineItems" xlink:to="ProfitLossAttributableToNoncontrollingInterests" xlink:title="presentation: StatementOfIncomeStatementLineItems to ProfitLossAttributableToNoncontrollingInterests" order="19.0"/>
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_BasicEarningsLossPerShare" xlink:label="BasicEarningsLossPerShare" xlink:title="BasicEarningsLossPerShare"/>
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="StatementOfIncomeStatementLineItems" xlink:to="BasicEarningsLossPerShare" xlink:title="presentation: StatementOfIncomeStatementLineItems to BasicEarningsLossPerShare" order="20.0"/>
    <link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_DilutedEarningsLossPerShare" xlink:label="DilutedEarningsLossPerShare" xlink:title="DilutedEarningsLossPerShare"/>
    <link:presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="StatementOfIncomeStatementLineItems" xlink:to="DilutedEarningsLossPerShare" xlink:title="presentation: StatementOfIncomeStatementLineItems to DilutedEarningsLossPerShare" order="21.0"/>
  </link:presentationLink>
</link:linkbase>
