Code to Accompany Chapter 12: Boolean Operations

   Contributed by:
      Steven Wartik
      Software Productivity Consortium
      Herdon VA 22070

   The files in this directory contain code for implementing boolean 
   operations on retrieve sets using a hashed representation and a
   bit vector representation.  This directory should contain the
   following files:

   makefile      Builds object code and test drivers

   bv.c          Bit vector implementation code
   bv.h          Bit vector implementation header
   hash.c        Hashed implementation code
   hash.h        Hashed implementation header

   bvdriver.c    Test driver for the bit vector implementation
   hdriver.c     Test driver for the hashing implementation

   Detailed information about the implementation and how to use it can 
   be found in the Makefile and the various source code files.