Variants consistency

Variants' names should be consistent, I don't think it's the case now: for example, libsdl-framework has a nostatic variant, whereas the expat's one is named no_static. It would be nice to have some kind of naming guidelines for this kind of things. Why not an equivalent of the use.desc file of Gentoo's Portage package manager which would provide some kind of global variants? N_Ox.