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A: Directly? No. To be validated against a DTD anXML document can have only one document type declaration. (That’s theportion of the document prolog starting”<!DOCTYPE…”) And a document type declaration canreference only one DTD. If you think about it, this makes perfectsense: One of the requirements of well-formedness (let alonevalidation) is that there be only one root element. So givenone DTD which defines elements A, B, and C, and another which definesX, Y, and Z, how do you get a sing 
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