Compositionally modular Scheme

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.