It's unfortunately one way; from calibre to Kobo.
The actual info is stored within the Kobo database in two tables; Shelf and ShelfContent.
Shelf lists the shelves that exist (column Name contains the actual name of the shelf), and ShelfContent what is on all the shelves (ShelfName the shelf in question, and ContentID the file name of the book on the shelf).
On thing worth knowing though is that it's fairly simple using calibre to automate the creation of a "Finished" shelf via retrieval of the reading % of the books via the Kobo Utilities plugin (and additionally one step of doing that is to retrieve the reading status of all books, which can then be restored afterwards.)
Last edited by PeterT; 09-26-2013 at 08:07 AM.
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