LaTeX is but the code of a LaTeX isn't. You should be able to create whatever you want out of it. The commands in the file (just) have to be interpret different

LaTeX is but the code of a LaTeX isn't. You should be able to create whatever you want out of it. The commands in the file (just) have to be interpret differently and yes, this "just" thing is the big point, because it is not easy, especially for a language which is as old as LaTeX. For me it is odd, I currently rely on LaTeX for my workflow. Creating documents which includes other PDF files and a certain pre defined layout is (for me) very easy to do in LaTeX. Especially if the ground work (layout) is done.