Tags are nice. Then you can mix and match freely, and combine as you need. But some hierarchy is good to ensure uniform use of tags.
Type of book: Fiction/Nonfiction/Reference.
Genre elements included: Romance/Crime/Disaster/Cooking/Medicine/Religion/Astronomy/Fantasy/Biography/Travel/Unclassifiable.
Places/settings: Italy/USA/Greece/Titanic/Hell.
Time: 1800 CE. 11 BCE. Prehistoric. Iron Age. Contemporary. Near future.
It helps a lot if your reader device/app support browsing using tags...
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