<xsd:complexType name="BSaddressStructure">

<xsd:sequence>

<xsd:element name="SAON" type="AONstructure" minOccurs="0">

<xsd:annotation>

<xsd:documentation>Secondary Addressable Object</xsd:documentation>

</xsd:annotation>

</xsd:element>

<xsd:element name="PAON" type="AONstructure">

<xsd:annotation>

<xsd:documentation>Primary Addressable Object</xsd:documentation>

</xsd:annotation>

</xsd:element>

<xsd:sequence>

<xsd:element name="StreetDescription" type="StreetDescriptorType"/>

<xsd:element name="UniqueStreetReferenceNumber" type="USRNtype" minOccurs="0"/>

</xsd:sequence>

<xsd:choice>

<xsd:sequence>

<xsd:element ref="Locality"/>

<xsd:choice minOccurs="0">

<xsd:sequence>

<xsd:element ref="Town"/>

<xsd:element ref="AdministrativeArea" minOccurs="0"/>

</xsd:sequence>

<xsd:element ref="AdministrativeArea"/>

</xsd:choice>

</xsd:sequence>

<xsd:sequence>

<xsd:element ref="Town"/>

<xsd:element ref="AdministrativeArea" minOccurs="0"/>

</xsd:sequence>

<xsd:element ref="AdministrativeArea"/>

</xsd:choice>

<xsd:element name="PostTown" type="PostTownType" minOccurs="0"/>

<xsd:element name="PostCode" type="PostCodeType" minOccurs="0"/>

<xsd:element name="UniquePropertyReferenceNumber" type="UPRNtype" minOccurs="0"/>

</xsd:sequence>

</xsd:complexType>