What is required to be IRI compliant?

[Solene Rapenne]

Hello,

I am the author of a gemini daemon written in C. In
regards to the discussion about IRI, I added tests
to my project to try utf-8 or emojis queries.

Requests such as the following are working well:

- gemini://ho?t/? ?.gmi
- gemini://?//??.gmi

Honestly, I am very surprised it works, in my code
everything are simple char arrays (in C), but it does.

Are there other specifics handling required for being
IRI compliant? I'm not sure I understood exactly what
it means.