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Old 10-24-2011, 02:42 PM   #1
essence
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Calibre Cover ID won't verify with ePub

I might be totally missing something here, but I never used to have this problem. I am getting an "ID invalid" error when trying to verify my ePubs most of the time. (The files work fine, but I need them to get through the ePub verify unless Apple has loosened up their rules.)

After experimenting, it seems to boil down to when the random ID that Calibre assigns to the Cover file in the content.opf file starts with a number. If it starts with the letter, then it is a "legal" ID and it verifies properly.

If I manually change the ID to start with a letter, it passes. But that is a bit of a pain, of course.

Anyone know more about this and if it can be fixed automatically through Calibre?
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Old 10-24-2011, 10:10 PM   #2
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IIRC the id assigned to cover is always "cover" (this is because some ebook readers stupidly require it to be "cover" and nothing else). So what are you referring to?
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Old 10-25-2011, 10:46 AM   #3
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The ID's I'm getting are a long series of numbers and letters. Here is the line in the content.opf that is causing trouble:

<item href="Text/cover.xhtml" id="57ad97cc-957c-4506-9238-172641322ada" media-type="application/xhtml+xml" />

If I change the id to something that starts with a letter, ie. "a7ad97cc-..." then it passes the ePub verification.

If Calibre happens to give it an ID that starts with a letter, then it will pass without any issues. I don't remember that happening a few months ago when I last used Calibre. If I look at an old ePub, it has the cover line written much simpler:

<item href="Text/cover.xhtml" id="cover" media-type="application/xhtml+xml" />

Am I missing something/doing something wrong? Thanks for your help.
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Old 10-25-2011, 10:14 PM   #4
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Make sure you are running the latest calibre release. Secondly I need a test case that reproduces this behavior to tell you more.
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