Paper and book items should have the option to set a message to them that can be set using a command and is saved on the item so that the paper or book can be put in a chest and saved as information or sent to other players while someone is offline.
Papers:
Using "/writemessage *message*" while holding a paper should set the message to whatever you typed.
Using "/readmessage" should display the message written on the paper on hand in the IDP.
Perhaps papers could be like that, then books could have more?
Books:
A book's title could be set using "/settitle *title*", and the title would be displayed when the cursor is hovered over the book. I'm not sure if this is possible, but it would be cool.
A book could also have multiple pages, perhaps ten?
Using "/writepage *#* *message" while holding a book could set the message of that page to the message.
Using "readpage *#*" while holding a book would display the message on the given page.
I used different commands for papers and books, but same commands would be more efficient for players. Just not sure if the same commands writing and reading books and papers, considering the different fields, would be possible.