Thanks Mr.Maisey for your clear explanation.
But...then another question rises in my mind: who is an Empu or ... (better) : when and why a person becames Empu?
From your explanation I suppose only for Kraton determination!
But then....I live in a cowntry notorious
for corruption where people that have a lot of money can change the rules or can do all they want.... if, for paradox, keris art would be an italian art i'm shure a lot of Empu's title would be buy.