xml dtd

books.dtd 
<!ELEMENT library (book+)> 
<!ELEMENT book (title, author, isbn, publisher, edition, price)> 
<!ELEMENT title (#PCDATA)> 
<!ELEMENT author (#PCDATA)> 
<!ELEMENT isbn (#PCDATA)> 
<!ELEMENT publisher (#PCDATA)> 
<!ELEMENT edition (#PCDATA)> 
<!ELEMENT price (#PCDATA)> 
books.xsd 
<?xml version="1.0" encoding="UTF-8"?> 
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema"> 
<xs:element name="library"> 
<xs:complexType> 
<xs:sequence> 
<xs:element name="book" maxOccurs="unbounded"> 
<xs:complexType> 
<xs:sequence> 
<xs:element name="title" type="xs:string"/> 
<xs:element name="author" type="xs:string"/> 
<xs:element name="isbn" type="xs:string"/> 
<xs:element name="publisher" type="xs:string"/> 
<xs:element name="edition" type="xs:string"/> 
<xs:element name="price" type="xs:decimal"/> 
</xs:sequence> 
</xs:complexType> 
</xs:element> 
</xs:sequence> 
</xs:complexType> 
</xs:element> 
</xs:schema>