Custom columns

GeniusJ · 01-14-2023, 01:41 PM

Does custom column data get embedded in the book's metadata?

In other words, if I have a custom column named "Favorites" with a Yes/No field and I've selected "Yes" for a book, and I convert the book or other wise re-embed the book's metadata, does that custom column data get embedded in the book? So if I took just the epub file and added it to a new install of Calibre that had that custom column configured, would the value of that book's custom column value get imported?

Or does the custom column value only live in the book's metadata.opf file and not in the book itself?

I hope my question makes sense.

ownedbycats · 01-14-2023, 01:58 PM

Yes. After running Embed Metadata on an ePub (I presume this uses the same method as Polish, unsure for Modify ePub), column information appear in content.opf. Both regular and composite columns.

EDIT: Modify Epub option to "remove non-dc: metadata elements" will nuke them, but only ePubs.

GeniusJ · 01-14-2023, 02:08 PM

Thank you!

01-14-2023, 01:41 PM	#1
GeniusJ Connoisseur Posts: 86 Karma: 361730 Join Date: Sep 2020 Device: Kindle	Custom columns Does custom column data get embedded in the book's metadata? In other words, if I have a custom column named "Favorites" with a Yes/No field and I've selected "Yes" for a book, and I convert the book or other wise re-embed the book's metadata, does that custom column data get embedded in the book? So if I took just the epub file and added it to a new install of Calibre that had that custom column configured, would the value of that book's custom column value get imported? Or does the custom column value only live in the book's metadata.opf file and not in the book itself? I hope my question makes sense.

01-14-2023, 01:58 PM	#2
ownedbycats Custom User Title Posts: 10,981 Karma: 75337983 Join Date: Oct 2018 Location: Canada Device: Kobo Libra H2O, formerly Aura HD	Yes. After running Embed Metadata on an ePub (I presume this uses the same method as Polish, unsure for Modify ePub), column information appear in content.opf. Both regular and composite columns. EDIT: Modify Epub option to "remove non-dc: metadata elements" will nuke them, but only ePubs. Last edited by ownedbycats; 01-14-2023 at 02:04 PM.

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01-14-2023, 02:08 PM	#3
GeniusJ Connoisseur Posts: 86 Karma: 361730 Join Date: Sep 2020 Device: Kindle	Thank you!

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