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=item get_setter( )

Returns the current setter of the attribute.

=item is_value_set( )

Returns true if the value of the attribute is set or false if not.

=item set_question( QUESTION, RESPONSES )

Allows a question to ask of the user to set the value of the attribute. QUESTION is the text that will be displayed to the user and RESPONSES is a list of valid responses that the user may select from.

=item get_question( )

Returns the QUESTION and list of valid RESPONSES for the attribute.

=item has_question( )

Returns true if the attribute has a question to ask the user if the VALUE of the attribute has not already been set.

=item name( )

This method returns the value of the NAME argument that was set when the object was constructed.

=back

=head2 Private methods

None

=head1 ENVIRONMENT

None

=head1 DIAGNOSTICS

=over 4

=item Knowledge->new() takes 1 argument

When the constructor is initialised it requires one argument. This message is given if more of less arguments are given.

=item Knowledge->new() argument 1, (NAME) is undefined

The correct number of arguments were supplied to the constructor, however the first argument, NAME, was undefined.

=item Knowledge->reset() takes no arguments

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

=item Knowledge->set_value() takes 2 argument

When the method is called it requires two arguments. This message is given if more of less arguments are given.

=item Knowledge->set_value() argument 1, (VALUE) is undefined

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

=item Knowledge->set_value() argument 2, (SETTER) is undefined

The correct number of arguments were supplied to the method call, however the second argument, SETTER, was undefined.

=item Knowledge->set_value() has already been set

This method has already been called and the value set. It cannot be called twice.

=item Knowledge->get_value() takes no arguments

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

=item Knowledge->get_setter() takes no arguments

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

=item Knowledge->is_value_set() takes no arguments

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

=item Knowledge->set_question() takes 2 arguments

When the method is called it requires two arguments. This message is given if more of less arguments are given.

=item Knowledge->set_question() argument 1, (QUESTION) is undefined

The correct number of arguments were supplied to the method call, however the first argument, QUESTION, was undefined.

=item Knowledge->set_question() has already been set

This method has already been called and the value set. It cannot be called twice.

=item Knowledge->get_question() takes no arguments

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

=item Knowledge->get_question() has not been set

The value has not been set by Knowledge->set_question() and, therefore, cannot be retrieved.

=item Knowledge->has_question() takes no arguments

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

=item Knowledge->name() takes no arguments

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

=back

=head1 BUGS

None

=head1 FILES

See Knowledge.t in the test directory

=head1 SEE ALSO

AI::ExpertSystem::Simple - The base class for the expert system shell

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