30000 < kind < 39999 used for Parameterized Replaceable Events.
I had to choose one and that's 33888.
currently it's just Pinstr.
btw it's not a rule or a defined NIP, some clients may want to use it for another usecases.
Discussion
Nice, I see, but a question, the format you have for making lists where you define headers in one tag and pins in others can be a bit complicated to handle and parametrize for different clients, why not something like nip51 sets up for categorized bookmarks? ["Key", "value"], and keep adding values if necessary, ["Key", "value1", "value2", "value3" ] Do you think this could be more manageable for the other nostr clients?
because each item of a list should have been defined in a separate tag item. for example in NIP-51 for creating a 'Categorized People' list, we are using ['p', '
btw, there are soooooo many different approaches, and a lot of them just work!