flex Expert System Toolkit - LPIS

2. Frames and Inheritance 18
define the hierarchy such that the meal of sammy is specially inherited from
herbivore and not by normal inheritance from carnivore (via cat and
feline). Note that this only affects the meal attribute.
Carnivore
Feline
Cat
Herbivore
Sylvester
Sammy
Meals
The corresponding KSL code would be:
instance sammy is an instance of cat ;
inherit meal from herbivore .
Note that herbivore is not a parent of sammy: it only contributes the
meal attribute.
Negative Inheritance
In flex the inheritance of a particular attribute for a particular frame may be
suppressed.
For example, manx cats do not have tails, if as part of our hierarchy we
have defined the tail attribute in the feline frame. We could define the
manx frame such that the inheritance of the tail attribute is suppressed.
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