Something wrong with XML Schema <xs:redefine> -

i want redefine complex types existing schema file. when i'm using altova xmlspy reported error. shows:

redefining type definition 'address' must extension or restriction of itself. error location: xs:schema / xs:redefine / xs:complextype / xs:complexcontent / xs:extension / @base details src-redefine.5: redefining type definition 'address' must extension or restriction of itself.

and source code has have <xs:extension> part in it.

<xs:redefine schemalocation="reusable.xsd">   <xs:complextype name="address">     <xs:complexcontent>       <xs:extension  base="address">         <xs:sequence>           <xs:element name="postcode"/>         </xs:sequence>       </xs:extension>     </xs:complexcontent>   </xs:complextype> </xs:redefine> 

i can't figure out what's wrong it. here's source code of schema files.

source.xsd

<?xml version="1.0" encoding="utf-8"?> <xs:schema xmlns:xs="http://www.w3.org/2001/xmlschema" targetnamespace="we:love:xml:schemas:but:we:hate:namespaces">   <xs:redefine schemalocation="reusable.xsd">     <xs:complextype name="address">       <xs:complexcontent>         <xs:extension base="address">           <xs:sequence>             <xs:element name="postcode" />           </xs:sequence>         </xs:extension>       </xs:complexcontent>     </xs:complextype>   </xs:redefine>   <xs:element name="resume">     <xs:annotation>       <xs:documentation>comment describing root element</xs:documentation>     </xs:annotation>   </xs:element> </xs:schema> 

thanks in advance.

reusable.xsd

<?xml version="1.0" encoding="utf-8"?> <xs:schema xmlns:xs="http://www.w3.org/2001/xmlschema" xmlns:xf="we:love:xml:schemas:but:we:hate:namespaces" targetnamespace="we:love:xml:schemas:but:we:hate:namespaces" elementformdefault="qualified" attributeformdefault="unqualified">     <xs:complextype name="address">         <xs:annotation>             <xs:documentation>this type meant represent generic address. consists of                 unlimited number of street addresses, city, state or province, postal code, ,                 country. suggested if need be, on transform use conditional processing                 based on country element country specific layouts of             addresses.</xs:documentation>         </xs:annotation>         <xs:sequence>             <xs:element name="streetaddress" type="xs:string" maxoccurs="unbounded"/>             <xs:element name="city"/>             <xs:element name="stateorprovince" type="xs:string" minoccurs="0"/>             <xs:element name="postalcode" type="xs:string"/>             <xs:element name="country" type="xf:countrytype"/>         </xs:sequence>     </xs:complextype> </xs:schema> 

your choice of namespace uri says all. don't want extend "address", want extend "wlxsbwhns:address", prefix wlxsbwhns bound target namespace uri.