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This class implements a simple expert system shell that reads the rules from an XML 
knowledge base and questions the user as it attempts to arrive at a conclusion.

=head1 DESCRIPTION

=head2 Overview

This class is where all the work is being done and the other three classes are only 
there for support. At present there is little you can do with it other than run it. Future 
version will make subclassing of this class feasable and features like logging will be introduced.

To see how to use this class there is a simple shell in the bin directory which allows you 
to consult the example knowledge bases and more extensive documemtation in the docs directory.

There is a Ruby version that reads the same XML knowledge bases, if you are interested.

=head2 Constructors and initialisation

=over 4