.
It seems to be against several goals of Creole. There is already a markup similar to this proposal, less verbose, with end tags which can be recognized easily, standard and very popular: XML. Since Creole doesn't use single angle brackets, it would be easy to mix both.
We're soon going to have assigned a meaning to all double punctuation signs, so Creole won't be much more complicated than it is now. I'd suggest to reserve $$ for LaTeX math, __ for underlined, -- for deleted text and ++ and %% for future uses (all optional), and we're done. Both !! and ?? are too frequent in plain text to be safe.
-- YvesPiguet, 2007-Apr-2
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