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Extended datatype for the US addresses

File:  Schema.xsd <?xml version="1.0" ?> <xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema">   <xs:complexType name="Address">     <xs:sequence>       <xs:element name="Name" type="xs:string" />       <xs:element name="Street" type="xs:string" minOccurs="1"         maxOccurs="3" />       <xs:element name="City" type="xs:string" />     </xs:sequence>   </xs:complexType>   <xs:element name="MailAddress" type="Address" />   <xs:element name="BillAddress" type="Address" />   <xs:simpleType name="USPS_StateCode">     <xs:restriction base="xs:string">       <xs:enumeration value="AL" /><!-- Alabama -->       <xs:enumeration value="AK" /><!-- Alaska -->       <xs:enumeration value="WY" /><!-- Wyoming -->     </xs:restriction>   </xs:simpleType>   <xs:simpleType name="USPS_ZIP">     <xs:restriction base="xs:integer">       <xs:minInclusive value="01000" />       <xs:maxInclusive value="99999" />     </xs:restriction>   </xs:simpleType>   <xs:complexType name="USA_Address">     <xs:complexContent>       <xs:extension base="Address">         <xs:sequence>           <xs:element name="State" type="USPS_StateCode" />           <xs:element name="ZIP" type="USPS_ZIP" />         </xs:sequence>       </xs:extension>     </xs:complexContent>   </xs:complexType> </xs:schema> File: Address.xsml  <?xml version="1.0" ?> <MailAddress xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"           xsi:noNamespaceSchemaLocation="Schema.xsd"          xsi:type="USA_Address">    <Name>name</Name>    <Street>123 St.</Street>    <City>LA</City>    <State>AL</State>    <ZIP>11111</ZIP> </MailAddress>