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