<xs:element name="PostalCodeNumberExtension" minOccurs="0" maxOccurs="unbounded">
    <xs:annotation>
        <xs:documentation>Examples are: 1234 (USA), 1G (UK), etc.</xs:documentation>
    </xs:annotation>
    <xs:complexType mixed="true">
        <xs:attribute name="Type">
            <xs:annotation>
                <xs:documentation>Delivery Point Suffix, New Postal Code, etc..</xs:documentation>
            </xs:annotation>
        </xs:attribute>
        <xs:attribute name="NumberExtensionSeparator">
            <xs:annotation>
                <xs:documentation>The separator between postal code number and the extension. Eg. "-"</xs:documentation>
            </xs:annotation>
        </xs:attribute>
        <xs:attributeGroup ref="grPostal" />
        <xs:anyAttribute namespace="##other" />
    </xs:complexType>
</xs:element>