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The language data type is derived from the token type

<!-- schema --> <xsd:simpleType>   <xsd:restriction base="xsd:token">    <xsd:pattern value="([a-zA-Z]{2}|[iI]-[a-zA-Z]+|[xX]-    [a-zA-Z]{1,8})(-[a-zA-Z]{1,8})*"/>   </xsd:restriction> </xsd:simpleType> Restrict language type using enumeration. <!-- schema --> <xsd:element name="language_native">   <xsd:simpleType>    <xsd:restriction base="xsd:language">     <xsd:enumeration value="de"/>     <xsd:enumeration value="fr"/>     <xsd:enumeration value="en-GB"/>     <xsd:enumeration value="en-US"/>    </xsd:restriction>   </xsd:simpleType> </xsd:element> <!-- instance document --> <language_native>fr</language_native>