Error in validation of schema

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Why do I get the following error when I validate my Scheme

Results from W3C XML Schema validation:
Validation error:
Reason: The element 'Books' is used but not declared in the DTD/Schema.
Error code: -1072898035

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My XML doc

<?xml version ='1.0' ?>
<!DOCTYPE Books SYSTEM "BooksDTD.dtd">
<Books
xmlns="http://madeupbookshop.com/books"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://madeupbookshop.com/books books.xsd">
<Book>
<ISBN>12345</ISBN>
<PUBLISHER>Wrok</PUBLISHER>
<AUTHOR>
<FIRST_NAME>William</FIRST_NAME>
<LAST_NAME>Blake</LAST_NAME>
</AUTHOR>
<TITLE>Walk in the wood</TITLE>
<EDITION>First edition</EDITION>
<PRICE>$99.95</PRICE>
<PAGES>500</PAGES>
<DATE_PUBLISHED>12 January 2004</DATE_PUBLISHED>
<DESCRIPTION>I love trees</DESCRIPTION>
<IMAGE>one.gif</IMAGE>
</Book>
<Book>
<ISBN>12346</ISBN>
<PUBLISHER>Wrok</PUBLISHER>
<AUTHOR>
<FIRST_NAME>Erric</FIRST_NAME>
<LAST_NAME>Bird</LAST_NAME>
</AUTHOR>
<TITLE>eating to be large</TITLE>
<EDITION>First edition</EDITION>
<PRICE>$45.95</PRICE>
<PAGES>600</PAGES>
<DATE_PUBLISHED>16 January 2004</DATE_PUBLISHED>
<DESCRIPTION>Be big and fat</DESCRIPTION>
<IMAGE>two.jpg</IMAGE>
</Book>
<Books>

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I have the following schema

<?xml version="1.0"?>
<schema xmlns="http://www.w3.org/2001/XMLSchema"
xmlns:target="http://madeupbookshop.com/books"
targetNamespace="http://madeupbookshop.com/books"
elementFormDefault="qualified">
<element name="Books" type="target:booksType" />
<complexType name="AuthorType">
<sequence>
<element name="FIRST_NAME" type="string"/>
<element name="LAST_NAME" type="string"/>
</sequence>
</complexType>
<complexType name="bookType">
<sequence>
<element name="ISBN" type="string"/>
<element name="PUBLISHER" type="string"/>
<element name="AUTHOR" type="target:AuthorType"/>
<element name="TITLE" type="string"/>
<element name="EDITION" type="string"/>
<element name="PRICE" type="string"/>
<element name="PAGES" type="positiveInteger"/>
<element name="DATE_PUBLISHED" type="string"/>
<element name="DESCRIPTION" type="string"/>
<element name="IMAGE" type="string"/>
</sequence>
</complexType>
<complexType name="booksType">
<sequence>
<element name="Book" type="target:bookType" minOccurs="0" maxOccurs="unbounded" />
</sequence>
</complexType>
</schema>