How to map non printing characters in mim file?

[Ajith R]

Hi all,

For the layout I am designing, I need to map keys to non printing characters 
zwnj and zwj. How can I do that? Is there a way to specify Unicode code points 
directly?

I learned about mim file structure from the tutorial here 
https://www.nongnu.org/m17n/manual-en/m17nDBTutorial.html 
While the tutorial is great, some things are not mentioned in it. For example, 
which characters need to be quoted, which are the reserved words etc. Can you 
please point me to some resource that provides information like this, sort of 
mim file specification?

Thanks,
ajith