About validating XML file

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I wnat to let user upload a xml file, and import data in the the xml file
into database.
I want to require user the xml file must contain a declaration of dtd in the
xml like below:
<?xml version='1.0' encoding='utf-16'?>
<!DOCTYPE Product SYSTEM "Product.dtd">

How can I check if the xml contain a dtd declaration ?

 

[W.G. Ryan eMVP]

Do you definitely need the DTD or can you use a Schema? Schemas are a lot
easier to work with
http://support.microsoft.com/default.aspx?scid=kb;en-us;318504