<?xml version="1.0" encoding="UTF-8"?>
<schema xmlns="http://www.w3.org/2001/XMLSchema" 
        elementFormDefault="qualified" 
        targetNamespace="http://www.book.org" 
        xmlns:bk="http://www.book.org">

   <element name="Book">
     <complexType>
       <sequence>
         <element ref="bk:Title"/>
         <element ref="bk:Author"/>
         <element ref="bk:Date"/>
         <element ref="bk:ISBN"/>
         <element ref="bk:Publisher"/>
       </sequence>
     </complexType>
   </element>

   <element name="Title" type="string"/>
   <element name="Author" type="string"/>
   <element name="Date" type="integer"/>
   <element name="ISBN" type="NMTOKEN"/>
   <element name="Publisher" type="string"/>

</schema>