I am bit puzzled, read through the RFC itself (https://datatracker.ietf.org/doc/rfc10023/ https://datatracker.ietf.org/doc/rfc10023/) but could not find who is

I am bit puzzled, read through the RFC itself (https://datatracker.ietf.org/doc/rfc10023/ https://datatracker.ietf.org/doc/rfc10023/) but could not find who is going to use it and why?