What rules have been used for the current list of codepoints?

[Erik van der Poel]

Gerv,

What do you suggest for the labels other than the TLD and 2LD? Do you
suggest that the top-level registry adopt and enforce policies at all
levels, including 3LD, 4LD and so on? And/or do you suggest that the
user agent enforce some rules at those levels?

Erik