Yes, it should be easy.
It is a modified I-D format. (Modification being removal of IETF IPR+copyright and putting OIDF IPR+copyright instead.)
We have historically been working on XML, but I believe it can also be nroff.
There has not been much guidance/directives as to how to write them apart from it.
I suppose IETF does not.
Following ISO Directives etc. might be a good idea for creating a consistent document.
(e.g., terms should be defined before the first use, the definition has to be a sentence that can
be a drop-in replacement for the defined term, etc.)
Nat