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Old 09-24-2016, 09:50 PM   #1
mattcurtis
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Question How does Calibre handle ePub 3s?
So far, using Calibre 2.68 (macOS) it seems like whenever an ePub 3 is added to the library, Calibre simply parses the ePub 3 metadata and outputs an ePub 2. I haven't been able to get it to output an ePub 3 (with ePub 3 formatted metadata, using <meta property=...>).

Am I doing something wrong? How is ePub 3 implemented in Calibre? Lastly - is there any documentation available online on the metadata fields Calibre used and their values?

Thanks!
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Old 09-24-2016, 10:46 PM   #2
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conversion does not support outputting epub 3. Reading and writing metadata in epub 3 format is supported and input of epub 3 for conversion is supported.

If you want to see how epub 3 metadata is written simply add an epub 3 file to calibre and use save to disk. The metadata you set in calibre will be saved in epub 3 form in the output file.
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Old 09-25-2016, 07:47 AM   #3
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Originally Posted by kovidgoyal View Post
conversion does not support outputting epub 3. Reading and writing metadata in epub 3 format is supported and input of epub 3 for conversion is supported.

If you want to see how epub 3 metadata is written simply add an epub 3 file to calibre and use save to disk. The metadata you set in calibre will be saved in epub 3 form in the output file.
Thanks, that did it. Am I correct in thinking that the difference between Convert Book & Save to Disk, is that Convert Book outputs an ePub 2 (with css/html conversion options), whereas Save to Disk will output the original ePub, but with Calibre's metadata added?
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Old 09-25-2016, 08:01 AM   #4
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yes .
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Old 09-25-2016, 09:37 AM   #5
mattcurtis
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yes .
nice.
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