<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<!--
  This file is part of the Dutch Taxonomy (Nederlandse Taxonomie; NT)
  Intellectual Property of the State of the Netherlands
  Architecture: NT21
  Version: 20270217.a
  Release date: Aug, 2026
-->
<link:linkbase xmlns:gen="http://xbrl.org/2008/generic" xmlns:link="http://www.xbrl.org/2003/linkbase" xmlns:ref="http://www.xbrl.org/2006/ref" xmlns:reference="http://xbrl.org/2008/reference" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.xbrl.org/2006/ref http://www.xbrl.org/2006/ref-2006-02-27.xsd http://xbrl.org/2008/generic http://www.xbrl.org/2008/generic-link.xsd http://xbrl.org/2008/reference http://www.xbrl.org/2008/generic-reference.xsd">
  <link:roleRef roleURI="http://www.xbrl.org/2008/role/link" xlink:href="http://www.xbrl.org/2008/generic-link.xsd#standard-link-role" xlink:type="simple"/>
  <link:roleRef roleURI="http://www.xbrl.org/2008/role/reference" xlink:href="http://www.xbrl.org/2008/generic-reference.xsd#standard-reference" xlink:type="simple"/>
  <link:arcroleRef arcroleURI="http://xbrl.org/arcrole/2008/element-reference" xlink:href="http://www.xbrl.org/2008/generic-reference.xsd#element-reference" xlink:type="simple"/>
  <gen:link xlink:role="http://www.xbrl.org/2008/role/link" xlink:type="extended">
    <gen:arc xlink:arcrole="http://xbrl.org/arcrole/2008/element-reference" xlink:from="ocw-dm_IntangibleAssetTypedMember_loc" xlink:to="ocw-dm_RVDJ_2026-01-01_210_501_B_ref" xlink:type="arc"/>
    <gen:arc xlink:arcrole="http://xbrl.org/arcrole/2008/element-reference" xlink:from="ocw-dm_NameIndividualBoardMemberTypedMember_loc" xlink:to="ocw-dm_RVDJ_2026-01-01_660_518_ref" xlink:type="arc"/>
    <gen:arc xlink:arcrole="http://xbrl.org/arcrole/2008/element-reference" xlink:from="ocw-dm_PropertyPlantEquipmentTypedMember_loc" xlink:to="ocw-dm_RVDJ_2026-01-01_212_701_D_ref" xlink:type="arc"/>
    <gen:arc xlink:arcrole="http://xbrl.org/arcrole/2008/element-reference" xlink:from="ocw-dm_SubsidyIncomeDescriptionTypedMember_loc" xlink:to="ocw-dm_RVDJ_2026-01-01_660_403_ref" xlink:type="arc"/>
    <link:loc xlink:href="ocw-domains.xsd#ocw-dm_IntangibleAssetTypedMember" xlink:label="ocw-dm_IntangibleAssetTypedMember_loc" xlink:type="locator"/>
    <link:loc xlink:href="ocw-domains.xsd#ocw-dm_NameIndividualBoardMemberTypedMember" xlink:label="ocw-dm_NameIndividualBoardMemberTypedMember_loc" xlink:type="locator"/>
    <link:loc xlink:href="ocw-domains.xsd#ocw-dm_PropertyPlantEquipmentTypedMember" xlink:label="ocw-dm_PropertyPlantEquipmentTypedMember_loc" xlink:type="locator"/>
    <link:loc xlink:href="ocw-domains.xsd#ocw-dm_SubsidyIncomeDescriptionTypedMember" xlink:label="ocw-dm_SubsidyIncomeDescriptionTypedMember_loc" xlink:type="locator"/>
    <reference:reference id="ocw-dm_RVDJ_2026-01-01_210_501_B_ref" xlink:label="ocw-dm_RVDJ_2026-01-01_210_501_B_ref" xlink:role="http://www.xbrl.org/2008/role/reference" xlink:type="resource">
      <ref:Chapter>210</ref:Chapter>
      <ref:IssueDate>2026-01-01</ref:IssueDate>
      <ref:Name>Richtlijnen voor de jaarverslaggeving</ref:Name>
      <ref:Paragraph>501</ref:Paragraph>
      <ref:Subparagraph>b</ref:Subparagraph>
    </reference:reference>
    <reference:reference id="ocw-dm_RVDJ_2026-01-01_212_701_D_ref" xlink:label="ocw-dm_RVDJ_2026-01-01_212_701_D_ref" xlink:role="http://www.xbrl.org/2008/role/reference" xlink:type="resource">
      <ref:Chapter>212</ref:Chapter>
      <ref:IssueDate>2026-01-01</ref:IssueDate>
      <ref:Name>Richtlijnen voor de jaarverslaggeving</ref:Name>
      <ref:Paragraph>701</ref:Paragraph>
      <ref:Subparagraph>d</ref:Subparagraph>
    </reference:reference>
    <reference:reference id="ocw-dm_RVDJ_2026-01-01_660_403_ref" xlink:label="ocw-dm_RVDJ_2026-01-01_660_403_ref" xlink:role="http://www.xbrl.org/2008/role/reference" xlink:type="resource">
      <ref:Chapter>660</ref:Chapter>
      <ref:IssueDate>2026-01-01</ref:IssueDate>
      <ref:Name>Richtlijnen voor de jaarverslaggeving</ref:Name>
      <ref:Paragraph>403</ref:Paragraph>
    </reference:reference>
    <reference:reference id="ocw-dm_RVDJ_2026-01-01_660_518_ref" xlink:label="ocw-dm_RVDJ_2026-01-01_660_518_ref" xlink:role="http://www.xbrl.org/2008/role/reference" xlink:type="resource">
      <ref:Chapter>660</ref:Chapter>
      <ref:IssueDate>2026-01-01</ref:IssueDate>
      <ref:Name>Richtlijnen voor de jaarverslaggeving</ref:Name>
      <ref:Paragraph>518</ref:Paragraph>
    </reference:reference>
  </gen:link>
</link:linkbase>
