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Daddy Warpig has showed the way to define the cover for iPad.

I think we are suffering from disunity among companies just like different browsers do to the same HTML and CSS standard.
Adobe and Apple implement and render ePub in different ways, cover is one case.
Adobe(and all devices based on its SDK) will ignore those code about cover and get cover from the first page automatically,
and they recommend user using SVG as cover image.
While Apple and some other devices only recognize just a defined cover picture(not a page).

So if you define the cover in <meta> tag, iPad will show it, but ADE not,
if you define the cover in the first page, iPad will not show it.
So you have to define the cover in both <meta> and the first page, but some eReader then will show the cover twice. a very annoying problem.

And I think ePub standard doesn't state a clear, unique way of defining the cover, why just put cover so important a thing into a confusing <meta> tag, why not a tag like <cover src="cover.htm/cover.jpg" type="page/image"/>