PLAN is an evaluation model for a purely-functional database.
Actually, this "purely-functional database" phrase is a bit misleading, it's an attempt to describe a novel programming paradigm for which we don't yet have good vocabulary.
this novel programming paradigm is just urbit’s badly plagiarized Nix store combined with Nix’s lazy evaluation semantics and large parts of Nix’s syntax (with pointless extra bits stuck on, as is tradition). not one citation in the whole thing, of course
and these fucking doofuses still use Nix to build their shit! they’re gonna claim with a straight face this bullshit is so novel they can barely describe it?