Inheritance for Nostr event kinds is an interesting idea! What approach did you have in mind for this?

Simply creating a new Kind B that “claims” to inherit from Kind A doesn't work, as Kind A clients wouldn't recognize Kind B events by default. This isn't real inheritance.

I guess a true inheritance could be achieved by using Kind A with a special tag (e.g., [w, "application article"]) to indicate a subkind. This creates an inheritance framework for kinds. 
   - Kind A clients could render all Kind A events, ignoring subkind-specific properties
   - Subkind-specific clients focus on their relevant events

If we want to go one level deeper, we could simply extend the tag (e.g. [w, subkind, sub-subkind]). However, I’m not sure if that would ever be necessary. 

This method is backward compatible and pretty straightforward imo. 

Would it work for your use case?