In the help it says:
Quote:
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The problem is that tags ... don’t provide a hierarchy.
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http://manual.calibre-ebook.com/sub_...l#restrictions
I do not understand that. You can specify tags as hierarchical categories in the preferences the same way you can do with any own column.
What's the PROs & CONs or the essential differences between hierarchical columns and hierarchical tags?
Or in other words: what do i get more by using a hierarchical own column like "genre.x.y..." that i do not already have with a tag called "genre.x.y..."?