I changed the "book" level and "B" tag to "title" level and "T" tag, to prevent confusion with the "book::" prefix, and to keep it more generic (it won't always be a book title).
nostr:npub1fjqqy4a93z5zsjwsfxqhc2764kvykfdyttvldkkkdera8dr78vhsmmleku nostr:npub1ty3ftnetpxnlj42lgwkmwdxta69gfm5f9mfljvmwdgymvsf6pkuswhxq4p