flex Expert System Toolkit - LPIS

7. Knowledge Specification Language 104
question wall_colour
Please choose a colour for your room ;
choose from wall_colours .
The items in a group may be the names of rules, and the group may then be
referenced in a ruleset, or it may be part of a rule network.
Example
group food_rules
ask_for_the_starter, ask_for_the_entree .
ruleset dinner
contains food_rules .
A group may also be an ordered list of items which which may then be used
for comparison purposes (using the KSL keywords according to).
Examples
group fuzzy_ordering
impossible, improbable, possible, probable,
definite.
relation less_likely( A, B )
if A is less than B
according to fuzzy_ordering.
Synonyms
flex toolkit
A synonym can be used to make code easier to read by allowing the
replacement of frequently occurring terms or expressions with a mnemonic.
The synonym is textually replaced by its expression when the sentence in
which it occurs is being parsed.
One advantage of synonyms is improved readability; another is that when a
constant value changes it is easier to change it in the synonym declaration
than in every place it might occur in the code.
The basic format of a synonym is:
synonym name_to_replace replacement_expression .
All occurrences of name_to_replace in the KSL sentences following this
declaration will be replaced by the term replacement_expression.
Examples
synonym pi 3.14159.
At compile time all occurrences of pi will be replaced by the number
3.14159 .