How to write down a language design?

Hello ladies and gentlemen,

Please view this as a kind of brainstorming query to get myself ideas
how other people handle this matter. And here is the matter:

How do you keep notes of your creations? Especially I am talking about
the case of an unusual grammar and/or syntax. Which way do you prefer -
tons of examples plus explanations? Or some more abstract description?

Many thanks in advance for your replies. Take care, :-))

Harald

--
A mind all logic is like a knife all blade.
(Rabindranath Tagore)

Replies