I want to add some personal definitions to my ~/.XCompose file, but I don't want them to conflict with any official definitions (especially those that appear in the future and aren't defined yet).
Is there a special leading string (or other method) of providing a reserved namespace for private use?
I see that in
/usr/share/X11/locale/en_US.UTF-8/Compose, the following characters never appear immediately after a "Multi_key":
@ } $ &
so they would be potential candidates.
And perhaps more convenient, would be to simply repeat the compose button:
<Multi_key> <Multi_key> …
But before I invent my own standard for a local namespace, I'd like to know for sure that there isn't already one.