Quote:
Originally Posted by nikoski
In the help it says:
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..."? |
That sentence is saying that tags as defined by the global community are a mixed bag, not by nature hierarchical. They are words or phrases that describe something about the book, perhaps its content, perhaps it status, perhaps its source, or perhaps lots of other things. If some of those words/phrases contain periods then calibre can display those values as a hierarchy, but they will be intermixed with all the other tags with all their possibly different meanings.
Another way to say this is that there is no pre-defined base meaning for the tags category. They can be about the book, about where you bought it, about how you are managing the book in your library, and so on. If you create a new tags-like column, for example Genre, you control the meaning of the category (column), the universe of possible values, and the meanings of the individual values.
Of course you could decide that "tags" means "genre", but that could be rather difficult to enforce. Calibre creates tags for news. Downloading metadata will get you all sorts of things. And finally, that decision prevents you from using tags for things other than genre.
And of course you could do as you suggest: create a hierarchy in tags for genre using genre.x.y.z. However, that means that the outermost item conveys very little information beyond "click me to see what you really want to know."
Up to you, really.