For example, to define an alternative document ``style'' you simply replace the existing style definition.
\documentclass{article} \usepackage{maplems}
by (for example)
\documentclass[fullpage]{article} \usepackage[mapleenv]
Here, the standard LATEX ``article'' style has been modified by the contents of the two style files fullpage.sty and mapleenv.sty. The style ``mapleenv'' is necessary to provide the basic definitions for the special Maple environments but does not affect the basic page layout.