Reference your type with namespace
File: Data.xml
<?xml version="1.0"?>
<Books xmlns="http://www.java2s.com"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://www.java2s.com Schema.xsd">
<Book>
<Title>title 1</Title>
<Author>author 1</Author>
<Date>2008</Date>
<ISBN>1-11111-111-1</ISBN>
<Publisher>Publisher 1</Publisher>
</Book>
<Book>
<Title>title 2</Title>
<Author>author 2</Author>
<Date>2007</Date>
<ISBN>0-111-11111-1</ISBN>
<Publisher>Publisher 2</Publisher>
</Book>
<Book>
<Title>title 3</Title>
<Author>author 3</Author>
<Date>2004</Date>
<ISBN>0-11-111111-1</ISBN>
<Publisher>Publisher 3</Publisher>
</Book>
</Books>
File: Schema.xml
<?xml version="1.0"?>
<schema xmlns="http://www.w3.org/2001/XMLSchema"
targetNamespace="http://www.java2s.com"
xmlns:bk="http://www.java2s.com"
elementFormDefault="qualified">
<element name="Books">
<complexType>
<sequence>
<element ref="bk:Book" minOccurs="1" maxOccurs="unbounded"/>
</sequence>
</complexType>
</element>
<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="string"/>
<element name="ISBN" type="string"/>
<element name="Publisher" type="string"/>
</schema>
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