Keyi is a Taoist term, which refers to Taoist Dojo rituals. Ke, Ke can do actions.
"Cheng" in Shuowen has the meaning of law. Xun Qing said, "Cheng is accurate". The subject of "Jade Law" is also a process solution, so the subject is a program. As the saying goes, "according to the book" means acting like an instrument according to certain procedures.
etiquette refers to the etiquette program, French style, ritual style and ceremony of the system of laws and regulations, such as "salute is like etiquette".
The rules and procedures for Taoist priests to do Dojo rituals are based on different forms of different rituals and certain ritual form criteria, which is called "explaining things according to disciplines". As the saying goes, "from the book" is this synonym. Taoists call this "basic book" a "book of scientific instruments", and the "basic book" for doing certain rituals is called "so-and-so scientific instruments".