% Figure 18.9  Attribute definitions and examples for learning to 
% recognize objects from their silhouettes (from Figure 18.8).


attribute( size, [ small, large]).
attribute( shape, [ long, compact, other]).
attribute( holes, [ none, 1, 2, 3, many]).

example( nut, [ size = small, shape = compact, holes = 1]).
example( screw, [ size = small, shape = long, holes = none]).
example( key, [ size = small, shape = long, holes = 1]).
example( nut, [ size = small, shape = compact, holes = 1]).
example( key, [ size = large, shape = long, holes = 1]).
example( screw, [ size = small, shape = compact, holes = none]).
example( nut, [ size = small, shape = compact, holes = 1]).
example( pen, [ size = large, shape = long, holes = none]).
example( scissors, [ size = large, shape = long, holes = 2]).
example( pen, [ size = large, shape = long, holes = none]).
example( scissors, [ size = large, shape = other, holes = 2]).
example( key, [ size = small, shape = other, holes = 2]).