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Old 07-07-2013, 08:05 PM   #1
HFC3
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[SOLVED] What is the OPF file

Playing around with the save to disk template and I see that there is an OPF file that is saved as well as the cover and book.

What is that file? And, why is it needed when saving to disk?

Just curious

Thanks again

Harry

Last edited by HFC3; 07-07-2013 at 11:43 PM.
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Old 07-07-2013, 08:27 PM   #2
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Quote:
Originally Posted by HFC3 View Post
Playing around with the save to disk template and I see that there is an OPF file that is saved as well as the cover and book.

What is that file?
OPF stands for Open Packaging Format. The Open Packaging Format is a standard that is a part of the EPUB eBook specification. The OPF files store information for an associated eBook including the title of the eBook, the eBook language, creator, reading order and book ID. The OPF file is included in the EPUB archive to specify the metadata of the associated eBook. The OPF files are saved in XML format.

Calibre puts all the metadata into the OFP, including non-standard items (eg series) and custom column items.

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And, why is it needed when saving to disk?
I'm not sure why its needed when saving to disk, but that could also be said of the cover. For completeness sake I would think.

You can eyeball the OPF with a text editor (if you use something like Notepad++ it will look pretty), and because its XML its relatively easy to read it within a program.

The OPF files are 'needed' in the library folder to provide a means of restoring the library metadata database should it get damaged or lost.

BR
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Old 07-08-2013, 02:31 AM   #3
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The .opf file and cover image files are optional when using the Save to Disk feature. They are included by default as not all eBook formats allow the information to be embedded in the eBook itself.
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Old 07-08-2013, 05:15 AM   #4
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Originally Posted by HFC3 View Post
What is that file?
The .opf files you see in the calibre library are for database disaster recovery in case of corruption of the metadata.db database.
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