> >> I make use of a feature that in a project that consists of > >> several files allows me to compile each LaTeX file individually, > >> thus saving some compilation time while writing the > >> manuscript. I think such a system might be useful for inclusion > >> in LaTeX3. > > It would be a nice feature, I think, and I have written some macros > to do that. Currently I'm working on a new class which will include > them. how different from the conditional stuff and the combined documents stuff that i mentioned? i.e., what sort of specification are you working to?