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7. Knowledge Specification Language 72<br />
Examples<br />
Set Membership<br />
its colour is at or above the colour of money<br />
according to { red , blue , white , green }<br />
group fuzzy_ordering<br />
certain, probable, possible, unlikely, impossible .<br />
the likelihood of frost is less than probable<br />
according to fuzzy_ordering<br />
To test set membership, use the KSL keywords<br />
include<br />
includes<br />
included in<br />
does not include<br />
do not include.<br />
Examples<br />
Procedure Calls<br />
the staff include { john and mary }<br />
a surprise is included in the contents of the box<br />
the Rodent`s tail does not include bushy<br />
A condition can be a call to some procedure, either a <strong>flex</strong> relation, a<br />
<strong>flex</strong> action, or a Prolog call (either built-in or user-defined) . It is the means<br />
by which conditions (and thus rules and attached procedures) link into<br />
Prolog's backward chaining execution mode.<br />
Conjunctions and Disjunctions<br />
Conditions may be logically combined using and and or. The precedence<br />
associated with negations, conjunctions and disjunctions (not binds more<br />
tightly than and, which in turn binds more tightly than or) can be<br />
overridden by the introduction of square brackets.<br />
Examples<br />
C is some cat and M is C`s meal<br />
test1 and [ test2( X ) or alpha > 10 ]<br />
not [ test1 and test2 ]<br />
Context Switching<br />
If you wish to use a condition, but the context expects a directive, then the<br />
context can be switched by the use of the word check, optionally followed<br />
by the word that. For example, an action requires directives but a<br />
relation requires conditions.<br />
<strong>flex</strong> toolkit
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