They both have after-the fact specifications that (try to) codify various flavours that had already been released into the wild. (I assume you mean Wavefront Ob

They both have after-the fact specifications that (try to) codify various flavours that had already been released into the wild. (I assume you mean Wavefront Obj). It's a pity that they aren't better specified. The same holds for ini. Maybe that's just the curse of good engineering: If it's simple, it's easy to make a mess out of it.