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Unique field

File: Data.xml <?xml version="1.0"?> <Books xmlns="http://www.rntsoft.com"        xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"        xsi:schemaLocation="http://www.rntsoft.com Schema.xsd">    <Book>       <Title>title 1</Title>       <Author>author 1</Author>       <Date>1998</Date>       <Publisher>publisher 1</Publisher>    </Book>    <Book>       <Title>title 2</Title>       <Author>author 2</Author>       <Date>1977</Date>       <ISBN>2-222-22222-2</ISBN>       <Publisher>publisher 2</Publisher>    </Book> </Books> File: Schema.xsd <?xml version="1.0"?> <xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema"             targetNamespace="http://www.rntsoft.com"             xmlns="http://www.rntsoft.com"             xmlns:bk="http://www.rntsoft.com"             elementFormDefault="qualified">     <xsd:element name="Books">         <xsd:complexType>             <xsd:sequence>                 <xsd:element name="Book" maxOccurs="unbounded">                     <xsd:complexType>                         <xsd:sequence>                             <xsd:element name="Title" type="xsd:string"/>                             <xsd:element name="Author" type="xsd:string"/>                             <xsd:element name="Date" type="xsd:string"/>                             <xsd:element name="ISBN" type="xsd:string" minOccurs="0"/>                             <xsd:element name="Publisher" type="xsd:string"/>                         </xsd:sequence>                     </xsd:complexType>                 </xsd:element>             </xsd:sequence>         </xsd:complexType>         <xsd:unique name="UNIQ">             <xsd:selector xpath="bk:Book"/>             <xsd:field xpath="bk:ISBN"/>         </xsd:unique>     </xsd:element> </xsd:schema>