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ComplexType with extension

File: Data.xml <?xml version="1.0"?> <Book xmlns="http://www.rntsoft.com"       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"       xsi:schemaLocation="http://www.rntsoft.com Schema.xsd">     <Title>title 1</Title>     <Author>author 1</Author>     <Author>author 2</Author>     <Date>1993</Date>     <ISBN>1-11111-111-1</ISBN>     <Publisher>publisher 1</Publisher> </Book> File: Schema.xml <?xml version="1.0"?> <xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema"         targetNamespace="http://www.rntsoft.com"         xmlns="http://www.rntsoft.com"         elementFormDefault="qualified">     <xsd:element name="Book" type="bookType"/>               <xsd:complexType name="Publication">         <xsd:sequence>             <xsd:element name="Title" type="xsd:string" minOccurs="1" maxOccurs="unbounded"/>             <xsd:element name="Author" type="xsd:string" minOccurs="1" maxOccurs="unbounded"/>             <xsd:element name="Date" type="xsd:gYear" minOccurs="1" maxOccurs="1"/>         </xsd:sequence>     </xsd:complexType>     <xsd:complexType name="bookType">         <xsd:complexContent>             <xsd:extension base="Publication" >                 <xsd:sequence>                     <xsd:element name="ISBN" type="xsd:string" minOccurs="1" maxOccurs="1"/>                     <xsd:element name="Publisher" type="xsd:string" minOccurs="1" maxOccurs="1"/>                 </xsd:sequence>             </xsd:extension>         </xsd:complexContent>     </xsd:complexType> </xsd:schema>