Compositionally Modular Scheme

				      by
			       Guruduth Banavar
				Gary Lindstrom


			 Technical Report UUCS-95-020
			Department of Computer Science
			      University of Utah
			 Salt Lake City, UT 84112 USA


			      October 26, 1995

				   Abstract

	We present a new module system for Scheme that supports a high degree
of implementation reuse via module composition.  The module system encourages
breaking down a program into the smallest possible individually meaningful
modules, and recomposing them using a powerful set of adaptation and
combination mechanisms.  Even hierarchical nesting is achieved via a
composition operation.  This module system is shown to support a stronger and
more flexible notion of compositionality and reuse than traditional
class-based inheritance in object-oriented programming.  Finally, this module
system is itself implemented by reusing a language independent OO framework.

	Keywords: module systems, object-oriented programming,
inheritance, Scheme.