This NIP is not yet in main. Here is an overview of PRs referencing this NIP. 
draft of NIP-34: decentralized wikis OPEN @fiatjaf
NIP-34: Media Attachments OPEN @alexgleason
NIP-34 - Algorithmic Filter OPEN @arthurfranca
nip "Replaceable Versioned Events" OPEN @Giszmo
NIP-34 Relay Supported Features CLOSED @Semisol