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I get that warning message on pretty much every new book I open in Sigil.
I am puzzled as to why Sigil says the book is not well formed because I can open a book (that's not been opened in Sigil) in Freda, ADE, on my Kobo, on my Ipad and (shudder) Calibre and none of them complain that the book is malformed.
From my experience it's only Sigil that brings up the warning about the missing DOCTYPE tag. Also, if it is so important, why is that just about every book I come across is missing it? Even new releases appear not to have it so I can only assume it's not that critical.
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