DTD validation without a !DOCTYPE

I am doing some integration with a third-party. The project involves sending an XML request, receiving a response, parsing, and displaying the results in a browser. I have received DTDs from the third party, and must validate the request before the message is sent (posted) from my side. However, the third party requires that a <!DOCTYPE> declaration should not exist in the document. Can someone give me an example of how to validate an XML document with no <!DOCTYPE>? I am building the document object with JDOM. Also, any suggestions on a parser implementation?
Thanks,
Ben

This is the model I am using: I have millions of docs I need to
validate, so I am reading one at a time in memory, I process
the string for some offline edit operatiosn then validate the
resulted xml string. I am creating the parser once in memory
and validating each document by changing the xml string its
supposed to parse. (all are being validated against same DTD)
Now as I said before the timing actually surprised me also.. and I
have no explenation either.. I am running on a Windows2000/jdk1.4
and xerces.. and sax parser for validation. And the results were:
With string manipulation to change doctype:
DOMValidation: 13Microsecs
SAXValidation: 10Microsecs
and using entity stuff it was 29Microsecs. As I said I am just a
messenger presenting the results, and I would like to find
out also whats happening here.

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http://technet.oracle.com
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