plz help me to validate these XML code with DTD

i am trying to validate these xml with DTD but i am unable to validate this code with DTD please , can anybody suggest me best ideas to validate these xml with DTD

<?xml version="1.0" encoding="ISO-8859-1"?>
<bookStore>
 <book category="web tech" ID="1">
<name>Learning XML </name>
<price>100</price>
<publishedDate>2005/10/11</publishedDate>
</book>
<book category="literaure" ID="2">
<name>old man </name>
<balance>100</balance>
<publishedDate>2005/10/11</publishedDate>
</book>