<xs:element name="SubPremiseNumber" minOccurs="0" maxOccurs="unbounded">
    <xs:annotation>
        <xs:documentation> Specification of the identifier of a sub-premise. Examples of sub-premises are apartments and suites. sub-premises in a building are often uniquely identified by means of consecutive
identifiers. The identifier can be a number, a letter or any combination of the two. In the latter case, the identifier includes exactly one variable (range) part, which is either a 
number or a single letter that is surrounded by fixed parts at the left (prefix) or the right (postfix).</xs:documentation>
    </xs:annotation>
    <xs:complexType mixed="true">
        <xs:attribute name="Indicator">
            <xs:annotation>
                <xs:documentation>"TH" in 12TH which is a floor number, "NO." in NO.1, "#" in APT #12, etc.</xs:documentation>
            </xs:annotation>
        </xs:attribute>
        <xs:attribute name="IndicatorOccurrence">
            <xs:annotation>
                <xs:documentation>"No." occurs before 1 in No.1, or TH occurs after 12 in 12TH</xs:documentation>
            </xs:annotation>
            <xs:simpleType>
                <xs:restriction base="xs:NMTOKEN">
                    <xs:enumeration value="Before" />
                    <xs:enumeration value="After" />
                </xs:restriction>
            </xs:simpleType>
        </xs:attribute>
        <xs:attribute name="NumberTypeOccurrence">
            <xs:annotation>
                <xs:documentation>12TH occurs "before" FLOOR (a type of subpremise) in 12TH FLOOR</xs:documentation>
            </xs:annotation>
            <xs:simpleType>
                <xs:restriction base="xs:NMTOKEN">
                    <xs:enumeration value="Before" />
                    <xs:enumeration value="After" />
                </xs:restriction>
            </xs:simpleType>
        </xs:attribute>
        <xs:attribute name="PremiseNumberSeparator">
            <xs:annotation>
                <xs:documentation>"/" in 12/14 Archer Street where 12 is sub-premise number and 14 is premise number</xs:documentation>
            </xs:annotation>
        </xs:attribute>
        <xs:attribute name="Type" />
        <xs:attributeGroup ref="grPostal" />
        <xs:anyAttribute namespace="##other" />
    </xs:complexType>
</xs:element>