It will be read by the BookDecoder class.

The first line will be the title of the item
The content of the first line is the title of the item, and the content of the line after that is ignored.
The content after that becomes the body text.
Three or more = characters will cause a page switch.
The content after the last page switch will be ignored

Decoration code
Replace {} with the Minecraft decoration code
obfuscate:obfuscate
B:Bold
I:Italic
_:underscore
-:horizontal line
reset: Reset decoration
If more than one color is applied, they will be listed separately.
See BookDecoder for supported colors.