There are 4 sections where books are shown:
1. Wanted - shows books without links
2. Main page - shows books with links and all mandatory fields filled
3. Quarantine - shows books with links and not all mandatory fields filled
4. Expired - shows books with all links expired and deleted
See below for transitive diagram.
Numbers near arrows reflect some events and have the following meaning:
1 - Book's data uploaded (no links)
2 - First link added (all mandatory fields filled)
3 - First link added (not all mandatory fields filled)
4 - Last link expired and deleted
5 - New link added (all mandatory fields filled)
6 - New link added (not all mandatory fields filled)
7 - All mandatory fields filled