Quote:
Originally Posted by laji
eschwartz, thank you for your response. Now I have no time to answer, do it tomorrow. But, as it, in my opinion, affects your comment, too: would you so kind, as to read my comment just above yours?
(In short: my examples were only to show, how simple, but flexible the foobar's solution with nested functions + placholders; and these temporary calculations never are written in music files metadata, of course - what about I wrote in that, above, comment.)
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I regard them as cached information.
The
current values of custom template columns get saved in the database, and in the backup OPF.
It also gets saved in the EPUB metadata, but this is harmless info, saved in the calibre namespace and can be ignored.
In a totally purist sense, it could be regarded as wasteful and unclean to have them there
but the Modify EPUB plugin does have the ability to purge EPUBs of all non-Dublin Core metadata for exactly that reason.
Workflow:
- Use the Embed Metadata tool to update metadata in all books.
- Use Modify EPUB to remove all non-DC metadata.
- In Preferences ==> Saving books to disk uncheck Update metadata in saved copies
- Save to disk, or copy out of the library folder.
This would not take into account plugboards.