of NixOS to be specified externally from the main Nix expressions
(since an installation would be hard to maintain if users started
editing the NixOS expressions directory). But to make that
user-friendly we need:
- Hierarchical options (just like the Nixpkgs configuration).
- Option descriptions from which documentation can be generated.
- Validation (e.g., does each option exist? does it have a valid
value?).
- The option declarations should be inside the Nix expressions to
which they are relevant (rather than, say, one big file with option
declarations).
svn path=/nixu/trunk/; revision=7148
