Add elements in XML file not declared in the DTD

I have created a DTD with the basic structure of my XML File. But my XML file can contain elements which are not declared in the DTD. How can i acheive this using DTD? Is there any tag in DTD with the help of which this can be acheived?


Suppose my DTD is 
 
<!ELEMENT subject (books, teachers) >
<!ELEMENT books (#PCDATA) >
<!ELEMENT teachers (#PCDATA) >
 
and my XML File is
 
<subject>
   <books>
      <book1 />
      <book2 />
   </books>
   <teachers />
</subject>
 
How can I acheieve this kind of functionality such that my DTD validates my XML file and gives no parsing error.

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jdsiamAsked:
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Geert BormansConnect With a Mentor Information ArchitectCommented:
You can't.
You could use XML Schema.
There you can tell that the content of an element can be anything and that the validation should be "lax" for that part.
With DTD you can't achieve that.
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