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Old 03-20-2013, 08:54 PM   #1
eosrose
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Custom columns to call up metadata from epub's opf?

I have a collection of epubs that include both author (<dc:creator opf:role="aut">) and artist (<dc:creator opf:role="art">) information in the opf. The author information displays just fine, but I think I need to create a column to display the artists. I'd rather not have to add this information from scratch. Is there any way to create a column that will read this information if it exists in the epub...?
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Old 03-21-2013, 04:33 AM   #2
chaley
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No. Custom columns can read only the info in calibre's database for the book.

One way to get started would be to use the command line. Write a script/program that scans your library for epubs, extracts the OPF from the epub, extracts the artist information from that opf, then writes that information to a custom column using calibredb set_custom. The library scan could use a search to look for books that have not been processed, perhaps a tag or perhaps a boolean custom column.
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