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Como validar documentos XML usando DTD

O DTD pode estar em um arquivo externo

Example howto.html

<?xml version="1.0" encoding="ISO-8859-1"?>
 <!DOCTYPE howto SYSTEM "howto.dtd">
 <howto>
   <topic>
       <title>Java</title>
       <url>http://www.rgagnon.com/topics/java-xml.html</url>
   </topic>
     <topic>
       <title>PowerBuilder</title>
       <url>http://www.rgagnon.com/topics/pb-powerscript.htm</url>
   </topic>
   <topic>
         <title>Javascript</title>
         <url>http://www.rgagnon.com/topics/js-language.html</url>
   </topic>
   <topic>
         <title>VBScript</title>
         <url>http://www.rgagnon.com/topics/wsh-vbs.html</url>
   </topic>
 </howto>

Example howto.dtd

 <!ELEMENT howto (topic*)>
 <!ELEMENT topic (title,url)>
 <!ELEMENT title (#PCDATA)>
 <!ELEMENT url (#PCDATA)>

O DTD pode estar dentro do XML

 <?xml version="1.0" encoding="ISO-8859-1"?>
 <!DOCTYPE howto [ 
  <!ELEMENT howto (topic*)> 
  <!ELEMENT topic (title,url)> 
  <!ELEMENT title (#PCDATA)> 
  <!ELEMENT url (#PCDATA)> 
  ]>
 <howto>
   <topic>
       <title>Java</title>
       <url>http://www.rgagnon.com/topics/java-xml.html</url>
   </topic>
 ...
 </howto>

ReferĂȘncias