It should be composed of a single entry point describing the entirety of the package repository similar to the link:https://github.com/NixOS/nixpkgs/blob/767542707d394ff15ac1981e903e005ba69528b5/pkgs/top-level/all-packages.nix[`pkgs/top-level/all-packages.nix` for nixpkgs].
This is to easily import the package repository in a neat way.