a curiosity about custom columns and opf
I noticed that adding custom columns (or even simply shuffling columns around) will add a whole bunch of tags to each and all .opf and to data dumped via "calibredb show_metadata #".
The data seems to contain info about caolums and way of displaying them.
Added data also destroys opf formatting, but that's another story.
I was wondering why it is so.
I would have expected to have some metadata if (and only if) the column is filled for the specific book, displaying shouldn't be in the book metadata.
Obviously I'm looking at this from the wrong angle.
Can someone enlighten me?
TiA
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