XML Schemas: DTD Example

Example of DTD syntax

 <!ELEMENT book (title, chapter+)>
 <!ELEMENT chapter (heading, paragraph*)>
 <!ELEMENT heading (#PCDATA)>
 <!ELEMENT paragraph (#PCDATA)>
 <!ATTLIST book
     language CDATA #REQUIRED
     author CDATA #REQUIRED
 >

Corresponds to the following XML document:

<book language="en" author="Ernest Hemingway">
 <title>A Farewell to Arms</title>
 <chapter>
   <heading>Chapter One</heading>
   <paragraph> ... <paragraph>
   <paragraph> ... <paragraph>
 </chapter>
 <chapter>
   <heading>Chapter Two</heading>
   <paragraph> ... <paragraph>
   <paragraph> ... <paragraph>
 </chapter>
</book>

Read More