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Explain how the given answer was arrived at. The explanation is added to the log.

=back

=head2 Private methods

=over 4

=item _goal

A private method to get the goal data from the knowledgebase.

=item _rule

A private method to get the rule data from the knowledgebase.

=item _question

A private method to get the question data from the knowledgebase.

=item _add_to_log

A private method to add a message to the log.

=item _explain_this

A private method to explain how a single attribute was set.

=back

=head1 ENVIRONMENT

None

=head1 DIAGNOSTICS

=over 4

=item Simple->new() takes no arguments

When the constructor is initialised it requires no arguments. This message is given if 
some arguments were supplied.

=item Simple->reset() takes no arguments

When the method is called it requires no arguments. This message is given if 
some arguments were supplied.

=item Simple->load() takes 1 argument

When the method is called it requires one argument. This message is given if more or 
less arguments were supplied.

=item Simple->load() argument 1 (FILENAME) is undefined

The corrct number of arguments were supplied with the method call, however the first 
argument, FILENAME, was undefined.

=item Simple->load() XML parse failed

XML Twig encountered some errors when trying to parse the XML knowledgebase.

=item Simple->load() unable to use file

The file supplied to the load( ) method could not be used as it was either not a file 
or not readable.

=item Simple->process() takes no arguments

When the method is called it requires no arguments. This message is given if 
some arguments were supplied.

=item Simple->get_question() takes no arguments

When the method is called it requires no arguments. This message is given if 
some arguments were supplied.

=item Simple->answer() takes 1 argument

When the method is called it requires one argument. This message is given if more or 
less arguments were supplied.

=item Simple->answer() argument 1 (VALUE) is undefined

The corrct number of arguments were supplied with the method call, however the first 
argument, VALUE, was undefined.

=item Simple->get_answer() takes no arguments

When the method is called it requires no arguments. This message is given if 
some arguments were supplied.

=item Simple->log() takes no arguments

When the method is called it requires no arguments. This message is given if 
some arguments were supplied.

=item Simple->explain() takes no arguments

When the method is called it requires no arguments. This message is given if 
some arguments were supplied.

=back

=head1 BUGS

None

=head1 FILES

See the Simple.t file in the test directory and simpleshell in the bin directory.

=head1 SEE ALSO

AI::ExpertSystem::Simple::Goal - A utility class

AI::ExpertSystem::Simple::Knowledge - A utility class

AI::ExpertSystem::Simple::Rule - A utility class

=head1 AUTHORS