Object dumper for Scheme48, version 4

This library is a generalized object dumper for Scheme48.  It supports
completely user-specified object decomposition.

Taylor Campbell wrote this code and this associated documentation; he
places it in the public domain.

The doc/ directory contains documentation, and the scheme/ directory
contains the Scheme source code.  The interface & package definitions
for the library are in scheme/interfaces.scm & scheme/packages.scm.