Validation After ThreePress

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I attended the EPUB conference in NY this week. One of the speakers suggested an additional validation check after ThreePress. I thought the acronym was OED, but, can't locate any information on blogs using that acronym. This is supposed to be the final, ISO-type check. Does anyone know the name of this validation tool?

Hi dicorro,

I haven't heard of OED, perhaps someone else knows more. Anyway, the "canonical" validator for EPUB 2 and 3 is called EPUBCheck, and is available online at and as a downloadable binary at This is the tool that the Threepress validator was using before it started forwarding to

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