Quote:
Originally Posted by pilotbob
I actually prefer the tag based organization UI, it is much more flexible than using folders... I have become well used to it using sites like gmail and delicious and apps like Evernote which use the tag/search metaphor rather than the organize in files metaphor. I find I much prefer it now to folder based systems.
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In fact, tree structure is just one style of representation of data, not the internal implemenation. If Calibre uses XML (or similiar data structure), it will be easy to sort ebooks by certain tag, both in flat structure or in tree structure.