In all fairness, Kovid did put it that harsh but he has a good explanation.
Quote:
What you need for that is a tool that checks the book for known causes of error. Not a mindless tool that validates it against a DTD. The only reason epub validation exists at all is because, it is, quite literally, the simplest thing to program a tool that check HTML against a DTD and pops up lots of meaningless errors, as opposed to writing a tool that intelligently checks the HTML for things that are known to be problematic in real world usage.
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And that is a valid point.