<xs:simpleType name="QuestionnaireRelationshipTypes">
  <xs:restriction base="xs:NMTOKEN">
    <!-- Questionnaire relationships -->
    <xs:enumeration value="DRIV">
      <xs:annotation>
        <xs:appinfo>
          <xforms:label xml:lang="nl-NL">Afgeleide</xforms:label>
          <xforms:label xml:lang="en-US">Derived</xforms:label>
          <xforms:label xml:lang="de-DE">Abgeleitet</xforms:label>
        </xs:appinfo>
        <xs:documentation xml:lang="en-US">This Questionnaire is derived from a transaction expressed or specified in the @ref attribute</xs:documentation>
      </xs:annotation>
    </xs:enumeration>
    <!-- Questionnaire Response relationships -->
    <xs:enumeration value="ANSW">
      <xs:annotation>
        <xs:appinfo>
          <xforms:label xml:lang="nl-NL">Antwoord</xforms:label>
          <xforms:label xml:lang="en-US">Answer</xforms:label>
          <xforms:label xml:lang="de-DE">Antwort</xforms:label>
        </xs:appinfo>
        <xs:documentation xml:lang="en-US">This Questionnaire Response answers a Questionnaire specified in @ref</xs:documentation>
      </xs:annotation>
    </xs:enumeration>
  </xs:restriction>
</xs:simpleType>