<xs:element name="PostBoxNumberSuffix" minOccurs="0">
    <xs:annotation>
        <xs:documentation>Specification of the suffix of the post box number. eg. A in POBox:123A</xs:documentation>
    </xs:annotation>
    <xs:complexType mixed="true">
        <xs:attribute name="NumberSuffixSeparator">
            <xs:annotation>
                <xs:documentation>12-A where 12 is number and A is suffix and "-" is the separator</xs:documentation>
            </xs:annotation>
        </xs:attribute>
        <xs:attributeGroup ref="grPostal" />
        <xs:anyAttribute namespace="##other" />
    </xs:complexType>
</xs:element>