<?xml version="1.0" encoding="utf-8"?>

<!-- This file is part of the Dutch Taxonomy            -->
<!-- Intellectual Property State of the Netherlands     -->
<!-- Version NTP Version 1.1                            -->
<!-- Released by Dutch Taxonomy Project www.xbrl-ntp.nl -->
<!-- Release date Thu Mar  8 11:45:48 GMT 2007   -->
 
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    <loc xlink:type="locator" xlink:href="nl-common-data.xsd#nl-cd_CountryCodeISO" xlink:label="nl-cd_CountryCodeISO"/>
    <referenceArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-reference" xlink:from="nl-cd_CountryCodeISO" xlink:to="nl-cd_CountryCodeISO_ref"/>
    <reference xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/reference" xlink:label="nl-cd_CountryCodeISO_ref">
      <ref:Name>Besluit Int. Spaarrenterichtlijn</ref:Name>
    </reference>
    <reference xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/reference" xlink:label="nl-cd_CountryCodeISO_ref">
      <ref:Name>Wet IB2001</ref:Name>
      <ref:Article>6.3</ref:Article>
      <ref:Paragraph>1</ref:Paragraph>
    </reference>
    <reference xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/reference" xlink:label="nl-cd_CountryCodeISO_ref">
      <ref:Name>Wet LB1964</ref:Name>
    </reference>
    <loc xlink:type="locator" xlink:href="nl-common-data.xsd#nl-cd_DateOfBirth" xlink:label="nl-cd_DateOfBirth"/>
    <referenceArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-reference" xlink:from="nl-cd_DateOfBirth" xlink:to="nl-cd_DateOfBirth_ref"/>
    <reference xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/reference" xlink:label="nl-cd_DateOfBirth_ref">
      <ref:Name>Wet IB2001</ref:Name>
      <ref:Article>6.3</ref:Article>
      <ref:Paragraph>1</ref:Paragraph>
    </reference>
    <reference xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/reference" xlink:label="nl-cd_DateOfBirth_ref">
      <ref:Name>Wet LB1964</ref:Name>
    </reference>
    <loc xlink:type="locator" xlink:href="nl-common-data.xsd#nl-cd_DescriptionLocationAbroad" xlink:label="nl-cd_DescriptionLocationAbroad"/>
    <referenceArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-reference" xlink:from="nl-cd_DescriptionLocationAbroad" xlink:to="nl-cd_DescriptionLocationAbroad_ref"/>
    <reference xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/reference" xlink:label="nl-cd_DescriptionLocationAbroad_ref">
      <ref:Name>Wet LB1964</ref:Name>
    </reference>
    <loc xlink:type="locator" xlink:href="nl-common-data.xsd#nl-cd_DescriptionLocationNL" xlink:label="nl-cd_DescriptionLocationNL"/>
    <referenceArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-reference" xlink:from="nl-cd_DescriptionLocationNL" xlink:to="nl-cd_DescriptionLocationNL_ref"/>
    <reference xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/reference" xlink:label="nl-cd_DescriptionLocationNL_ref">
      <ref:Name>Wet LB1964</ref:Name>
    </reference>
    <loc xlink:type="locator" xlink:href="nl-common-data.xsd#nl-cd_DocumentCreationDate" xlink:label="nl-cd_DocumentCreationDate"/>
    <referenceArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-reference" xlink:from="nl-cd_DocumentCreationDate" xlink:to="nl-cd_DocumentCreationDate_ref"/>
    <reference xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/reference" xlink:label="nl-cd_DocumentCreationDate_ref">
      <ref:Name>Wet IB2001</ref:Name>
    </reference>
    <loc xlink:type="locator" xlink:href="nl-common-data.xsd#nl-cd_HouseNumberAbroad" xlink:label="nl-cd_HouseNumberAbroad"/>
    <referenceArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-reference" xlink:from="nl-cd_HouseNumberAbroad" xlink:to="nl-cd_HouseNumberAbroad_ref"/>
    <reference xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/reference" xlink:label="nl-cd_HouseNumberAbroad_ref">
      <ref:Name>Wet LB1964</ref:Name>
    </reference>
    <loc xlink:type="locator" xlink:href="nl-common-data.xsd#nl-cd_HouseNumberAddition" xlink:label="nl-cd_HouseNumberAddition"/>
    <referenceArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-reference" xlink:from="nl-cd_HouseNumberAddition" xlink:to="nl-cd_HouseNumberAddition_ref"/>
    <reference xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/reference" xlink:label="nl-cd_HouseNumberAddition_ref">
      <ref:Name>Wet LB1964</ref:Name>
    </reference>
    <loc xlink:type="locator" xlink:href="nl-common-data.xsd#nl-cd_HouseNumberNL" xlink:label="nl-cd_HouseNumberNL"/>
    <referenceArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-reference" xlink:from="nl-cd_HouseNumberNL" xlink:to="nl-cd_HouseNumberNL_ref"/>
    <reference xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/reference" xlink:label="nl-cd_HouseNumberNL_ref">
      <ref:Name>Wet LB1964</ref:Name>
    </reference>
    <loc xlink:type="locator" xlink:href="nl-common-data.xsd#nl-cd_Initials" xlink:label="nl-cd_Initials"/>
    <referenceArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-reference" xlink:from="nl-cd_Initials" xlink:to="nl-cd_Initials_ref"/>
    <reference xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/reference" xlink:label="nl-cd_Initials_ref">
      <ref:Name>Wet IB2001</ref:Name>
    </reference>
    <reference xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/reference" xlink:label="nl-cd_Initials_ref">
      <ref:Name>Wet LB1964</ref:Name>
    </reference>
    <loc xlink:type="locator" xlink:href="nl-common-data.xsd#nl-cd_Namebusiness" xlink:label="nl-cd_Namebusiness"/>
    <referenceArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-reference" xlink:from="nl-cd_Namebusiness" xlink:to="nl-cd_Namebusiness_ref"/>
    <reference xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/reference" xlink:label="nl-cd_Namebusiness_ref">
      <ref:Name>Wet IB2001</ref:Name>
    </reference>
    <loc xlink:type="locator" xlink:href="nl-common-data.xsd#nl-cd_NameRegion" xlink:label="nl-cd_NameRegion"/>
    <referenceArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-reference" xlink:from="nl-cd_NameRegion" xlink:to="nl-cd_NameRegion_ref"/>
    <reference xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/reference" xlink:label="nl-cd_NameRegion_ref">
      <ref:Name>Wet LB1964</ref:Name>
    </reference>
    <loc xlink:type="locator" xlink:href="nl-common-data.xsd#nl-cd_Nationality" xlink:label="nl-cd_Nationality"/>
    <referenceArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-reference" xlink:from="nl-cd_Nationality" xlink:to="nl-cd_Nationality_ref"/>
    <reference xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/reference" xlink:label="nl-cd_Nationality_ref">
      <ref:Name>Wet IB2001</ref:Name>
    </reference>
    <reference xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/reference" xlink:label="nl-cd_Nationality_ref">
      <ref:Name>Wet LB1964</ref:Name>
    </reference>
    <loc xlink:type="locator" xlink:href="nl-common-data.xsd#nl-cd_PlaceOfResidenceAbroad" xlink:label="nl-cd_PlaceOfResidenceAbroad"/>
    <referenceArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-reference" xlink:from="nl-cd_PlaceOfResidenceAbroad" xlink:to="nl-cd_PlaceOfResidenceAbroad_ref"/>
    <reference xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/reference" xlink:label="nl-cd_PlaceOfResidenceAbroad_ref">
      <ref:Name>Wet LB1964</ref:Name>
    </reference>
    <loc xlink:type="locator" xlink:href="nl-common-data.xsd#nl-cd_PlaceOfResidenceNL" xlink:label="nl-cd_PlaceOfResidenceNL"/>
    <referenceArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-reference" xlink:from="nl-cd_PlaceOfResidenceNL" xlink:to="nl-cd_PlaceOfResidenceNL_ref"/>
    <reference xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/reference" xlink:label="nl-cd_PlaceOfResidenceNL_ref">
      <ref:Name>Wet IB2001</ref:Name>
      <ref:Article>6.3</ref:Article>
      <ref:Paragraph>1</ref:Paragraph>
    </reference>
    <reference xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/reference" xlink:label="nl-cd_PlaceOfResidenceNL_ref">
      <ref:Name>Wet LB1964</ref:Name>
    </reference>
    <reference xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/reference" xlink:label="nl-cd_PlaceOfResidenceNL_ref">
      <ref:Name>Wet OB1968</ref:Name>
      <ref:Article>37</ref:Article>
      <ref:Paragraph>A</ref:Paragraph>
    </reference>
    <loc xlink:type="locator" xlink:href="nl-common-data.xsd#nl-cd_POBoxNumber" xlink:label="nl-cd_POBoxNumber"/>
    <referenceArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-reference" xlink:from="nl-cd_POBoxNumber" xlink:to="nl-cd_POBoxNumber_ref"/>
    <reference xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/reference" xlink:label="nl-cd_POBoxNumber_ref">
      <ref:Name>Wet LB1964</ref:Name>
    </reference>
    <loc xlink:type="locator" xlink:href="nl-common-data.xsd#nl-cd_PostalCodeAbroad" xlink:label="nl-cd_PostalCodeAbroad"/>
    <referenceArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-reference" xlink:from="nl-cd_PostalCodeAbroad" xlink:to="nl-cd_PostalCodeAbroad_ref"/>
    <reference xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/reference" xlink:label="nl-cd_PostalCodeAbroad_ref">
      <ref:Name>Wet LB1964</ref:Name>
    </reference>
    <loc xlink:type="locator" xlink:href="nl-common-data.xsd#nl-cd_PostalCodeNL" xlink:label="nl-cd_PostalCodeNL"/>
    <referenceArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-reference" xlink:from="nl-cd_PostalCodeNL" xlink:to="nl-cd_PostalCodeNL_ref"/>
    <reference xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/reference" xlink:label="nl-cd_PostalCodeNL_ref">
      <ref:Name>Wet IB2001</ref:Name>
      <ref:Article>6.3</ref:Article>
      <ref:Paragraph>1</ref:Paragraph>
    </reference>
    <reference xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/reference" xlink:label="nl-cd_PostalCodeNL_ref">
      <ref:Name>Wet LB1964</ref:Name>
    </reference>
    <reference xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/reference" xlink:label="nl-cd_PostalCodeNL_ref">
      <ref:Name>Wet OB1968</ref:Name>
      <ref:Article>37</ref:Article>
      <ref:Paragraph>A</ref:Paragraph>
    </reference>
    <loc xlink:type="locator" xlink:href="nl-common-data.xsd#nl-cd_Prefix" xlink:label="nl-cd_Prefix"/>
    <referenceArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-reference" xlink:from="nl-cd_Prefix" xlink:to="nl-cd_Prefix_ref"/>
    <reference xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/reference" xlink:label="nl-cd_Prefix_ref">
      <ref:Name>Wet LB1964</ref:Name>
    </reference>
    <loc xlink:type="locator" xlink:href="nl-common-data.xsd#nl-cd_SexCode" xlink:label="nl-cd_SexCode"/>
    <referenceArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-reference" xlink:from="nl-cd_SexCode" xlink:to="nl-cd_SexCode_ref"/>
    <reference xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/reference" xlink:label="nl-cd_SexCode_ref">
      <ref:Name>Wet LB1964</ref:Name>
    </reference>
    <loc xlink:type="locator" xlink:href="nl-common-data.xsd#nl-cd_SignificantPartOfTheSurname" xlink:label="nl-cd_SignificantPartOfTheSurname"/>
    <referenceArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-reference" xlink:from="nl-cd_SignificantPartOfTheSurname" xlink:to="nl-cd_SignificantPartOfTheSurname_ref"/>
    <reference xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/reference" xlink:label="nl-cd_SignificantPartOfTheSurname_ref">
      <ref:Name>Wet IB2001</ref:Name>
      <ref:Article>6.3</ref:Article>
      <ref:Paragraph>1</ref:Paragraph>
    </reference>
    <reference xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/reference" xlink:label="nl-cd_SignificantPartOfTheSurname_ref">
      <ref:Name>Wet LB1964</ref:Name>
    </reference>
    <reference xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/reference" xlink:label="nl-cd_SignificantPartOfTheSurname_ref">
      <ref:Name>Wet OB1968</ref:Name>
      <ref:Article>37</ref:Article>
      <ref:Paragraph>A</ref:Paragraph>
    </reference>
    <loc xlink:type="locator" xlink:href="nl-common-data.xsd#nl-cd_StreetNameAbroad" xlink:label="nl-cd_StreetNameAbroad"/>
    <referenceArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-reference" xlink:from="nl-cd_StreetNameAbroad" xlink:to="nl-cd_StreetNameAbroad_ref"/>
    <reference xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/reference" xlink:label="nl-cd_StreetNameAbroad_ref">
      <ref:Name>Wet LB1964</ref:Name>
    </reference>
    <loc xlink:type="locator" xlink:href="nl-common-data.xsd#nl-cd_StreetNameNL" xlink:label="nl-cd_StreetNameNL"/>
    <referenceArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-reference" xlink:from="nl-cd_StreetNameNL" xlink:to="nl-cd_StreetNameNL_ref"/>
    <reference xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/reference" xlink:label="nl-cd_StreetNameNL_ref">
      <ref:Name>Wet IB2001</ref:Name>
      <ref:Article>6.3</ref:Article>
      <ref:Paragraph>1</ref:Paragraph>
    </reference>
    <reference xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/reference" xlink:label="nl-cd_StreetNameNL_ref">
      <ref:Name>Wet LB1964</ref:Name>
    </reference>
    <loc xlink:type="locator" xlink:href="nl-common-data.xsd#nl-cd_TaxReferenceNumber" xlink:label="nl-cd_TaxReferenceNumber"/>
    <referenceArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-reference" xlink:from="nl-cd_TaxReferenceNumber" xlink:to="nl-cd_TaxReferenceNumber_ref"/>
    <reference xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/reference" xlink:label="nl-cd_TaxReferenceNumber_ref">
      <ref:Name>Wet LB1964</ref:Name>
    </reference>
    <loc xlink:type="locator" xlink:href="nl-common-data.xsd#nl-cd_TelephoneNumber" xlink:label="nl-cd_TelephoneNumber"/>
    <referenceArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-reference" xlink:from="nl-cd_TelephoneNumber" xlink:to="nl-cd_TelephoneNumber_ref"/>
    <reference xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/reference" xlink:label="nl-cd_TelephoneNumber_ref">
      <ref:Name>Wet IB2001</ref:Name>
    </reference>
    <reference xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/reference" xlink:label="nl-cd_TelephoneNumber_ref">
      <ref:Name>Wet LB1964</ref:Name>
    </reference>
    <reference xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/reference" xlink:label="nl-cd_TelephoneNumber_ref">
      <ref:Name>Wet OB1968</ref:Name>
      <ref:Article>37</ref:Article>
      <ref:Paragraph>A</ref:Paragraph>
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