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Calibre's built in columns map to the subset of Dublin Core elements most commonly supported by typical ebook reading software and devices + the series column, from memory that's about 12.
However, its custom column feature provides a rich set of data types and there's no practical limit on the number of custom columns you can add. FX: readers of FanFiction have all sorts of custom columns - who's sleeping with who, cross-overs (???), universes, etc, etc. My Test library has over 50 custom columns (it's a mess).
BR
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