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  <xs:import schemaLocation="http://www.xbrl.org/2003/xbrl-instance-2003-12-31.xsd" namespace="http://www.xbrl.org/2003/instance" />
  <xs:import schemaLocation="http://www.esma.europa.eu/taxonomy/2020-03-16/esef_cor.xsd" namespace="http://www.esma.europa.eu/taxonomy/2020-03-16/esef_cor" />
  <xs:import schemaLocation="http://www.xbrl.org/lrr/arcrole/esma-arcrole-2018-11-21.xsd" namespace="http://www.esma.europa.eu/xbrl/esef/arcrole/wider-narrower" />
  <xs:import schemaLocation="http://www.xbrl.org/2005/xbrldt-2005.xsd" namespace="http://xbrl.org/2005/xbrldt" />
  <xs:annotation>
    <xs:appinfo>
      <link:linkbaseRef xlink:arcrole="http://www.w3.org/1999/xlink/properties/linkbase" xlink:href="abutenostrikotazas-2021-12-31_pre.xml" xlink:role="http://www.xbrl.org/2003/role/presentationLinkbaseRef" xlink:type="simple" />
      <link:linkbaseRef xlink:arcrole="http://www.w3.org/1999/xlink/properties/linkbase" xlink:href="abutenostrikotazas-2021-12-31_def.xml" xlink:role="http://www.xbrl.org/2003/role/definitionLinkbaseRef" xlink:type="simple" />
      <link:linkbaseRef xlink:arcrole="http://www.w3.org/1999/xlink/properties/linkbase" xlink:href="abutenostrikotazas-2021-12-31_lab-en.xml" xlink:role="http://www.xbrl.org/2003/role/labelLinkbaseRef" xlink:type="simple" />
      <link:linkbaseRef xlink:arcrole="http://www.w3.org/1999/xlink/properties/linkbase" xlink:href="abutenostrikotazas-2021-12-31_cal.xml" xlink:role="http://www.xbrl.org/2003/role/calculationLinkbaseRef" xlink:type="simple" />
      <link:linkbaseRef xlink:arcrole="http://www.w3.org/1999/xlink/properties/linkbase" xlink:href="http://www.esma.europa.eu/taxonomy/2020-03-16/esef_cor-lab-en.xml" xlink:role="http://www.xbrl.org/2003/role/labelLinkbaseRef" xlink:type="simple" />
      <link:linkbaseRef xlink:arcrole="http://www.w3.org/1999/xlink/properties/linkbase" xlink:href="http://www.esma.europa.eu/taxonomy/2020-03-16/esef_cor-gen-en.xml" xlink:type="simple" />
      <link:roleType id="Anchoring" roleURI="http://abutenostrikotaas.com/xbrl/2021/roles/Anchoring">
        <link:definition>99 - Groups all anchored elements</link:definition>
        <link:usedOn>link:definitionLink</link:usedOn>
        <link:usedOn>link:labelLink</link:usedOn>
      </link:roleType>
      <link:roleType id="NotesAndMandatoryItems" roleURI="http://abutenostrikotaas.com/xbrl/2021/roles/NotesAndMandatoryItems">
        <link:definition>01 - Notes And Mandatory Items</link:definition>
        <link:usedOn>link:definitionLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:labelLink</link:usedOn>
      </link:roleType>
      <link:roleType id="StatementOfFinancialPosition" roleURI="http://abutenostrikotaas.com/xbrl/2021/roles/StatementOfFinancialPosition">
        <link:definition>02 - Statement of financial position</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:labelLink</link:usedOn>
      </link:roleType>
      <link:roleType id="StatementOfComprehensiveIncome" roleURI="http://abutenostrikotaas.com/xbrl/2021/roles/StatementOfComprehensiveIncome">
        <link:definition>03 - Statement of comprehensive income</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:labelLink</link:usedOn>
      </link:roleType>
      <link:roleType id="StatementOfChangesInEquity" roleURI="http://abutenostrikotaas.com/xbrl/2021/roles/StatementOfChangesInEquity">
        <link:definition>04 - Statement of changes in equity</link:definition>
        <link:usedOn>link:definitionLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:labelLink</link:usedOn>
      </link:roleType>
      <link:roleType id="StatementOfCashFlows" roleURI="http://abutenostrikotaas.com/xbrl/2021/roles/StatementOfCashFlows">
        <link:definition>05 - Statement of cash flows</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:labelLink</link:usedOn>
      </link:roleType>
    </xs:appinfo>
  </xs:annotation>
  <xs:element id="abutenostrikotazas_StatementOfFinancialPositionTable" xbrli:periodType="duration" abstract="true" name="StatementOfFinancialPositionTable" nillable="true" xmlns:q1="http://xbrl.org/2005/xbrldt" substitutionGroup="q1:hypercubeItem" type="xbrli:stringItemType" />
  <xs:element id="abutenostrikotazas_StatementOfFinancialPositionLineItems" xbrli:periodType="duration" abstract="true" name="StatementOfFinancialPositionLineItems" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" />
  <xs:element id="abutenostrikotazas_ReceivablesFromSubsidiaries" xbrli:balance="debit" xbrli:periodType="instant" name="ReceivablesFromSubsidiaries" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" />
  <xs:element id="abutenostrikotazas_PrepaymentsToSubsidiaries" xbrli:balance="debit" xbrli:periodType="instant" name="PrepaymentsToSubsidiaries" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" />
  <xs:element id="abutenostrikotazas_BorrowingsFromParentCompany" xbrli:balance="credit" xbrli:periodType="instant" name="BorrowingsFromParentCompany" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" />
  <xs:element id="abutenostrikotazas_PayablesToOtherRelatedPartiesAndSubsidiaries" xbrli:balance="credit" xbrli:periodType="instant" name="PayablesToOtherRelatedPartiesAndSubsidiaries" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" />
  <xs:element id="abutenostrikotazas_StatementOfComprehensiveIncomeTable" xbrli:periodType="duration" abstract="true" name="StatementOfComprehensiveIncomeTable" nillable="true" xmlns:q2="http://xbrl.org/2005/xbrldt" substitutionGroup="q2:hypercubeItem" type="xbrli:stringItemType" />
  <xs:element id="abutenostrikotazas_StatementOfComprehensiveIncomeLineItems" xbrli:periodType="duration" abstract="true" name="StatementOfComprehensiveIncomeLineItems" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" />
  <xs:element id="abutenostrikotazas_StatementOfCashFlowsTable" xbrli:periodType="duration" abstract="true" name="StatementOfCashFlowsTable" nillable="true" xmlns:q3="http://xbrl.org/2005/xbrldt" substitutionGroup="q3:hypercubeItem" type="xbrli:stringItemType" />
  <xs:element id="abutenostrikotazas_StatementOfCashFlowsLineItems" xbrli:periodType="duration" abstract="true" name="StatementOfCashFlowsLineItems" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" />
  <xs:element id="abutenostrikotazas_ImpairmentOfInvestmentsInSubsidiaries" xbrli:balance="debit" xbrli:periodType="duration" name="ImpairmentOfInvestmentsInSubsidiaries" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" />
  <xs:element id="abutenostrikotazas_LeaseDiscountsReceived" xbrli:balance="debit" xbrli:periodType="duration" name="LeaseDiscountsReceived" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" />
  <xs:element id="abutenostrikotazas_IncreaseDecreaseInContractAsset" xbrli:balance="debit" xbrli:periodType="duration" name="IncreaseDecreaseInContractAsset" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" />
  <xs:element id="abutenostrikotazas_IncreaseDecreaseInNonCurrentReceivablesFromSubsidiaries" xbrli:balance="debit" xbrli:periodType="duration" name="IncreaseDecreaseInNonCurrentReceivablesFromSubsidiaries" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" />
  <xs:element id="abutenostrikotazas_IncreaseDecreaseInContractLiabilities" xbrli:balance="debit" xbrli:periodType="duration" name="IncreaseDecreaseInContractLiabilities" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" />
</xs:schema>