You can use this DTD:
<!DOCTYPE html PUBLIC "XHTML 1.0 Strict" "http://www.neester.com/DTD/xhtml-target.dtd";>
I made it myself from a tutorial. It is XHTML 1.0 Strict. But I modded it to allow target=_blank
Further on this subject, here's some interesting reading (including the subsequent discussion):
Validating a Custom DTD http://alistapart.com/articles/customdtd/
My intuition tells me that if custom DTDs proliferate then web standards will lose some of the commonality that holds them together (however shakily) today. However, I can't argue that point rigorously, and rolling one's own DTD, like monkeying with the innards of any machine for the first time, is undeniably fun.
Paul
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