flex Expert System Toolkit - LPIS

7. Knowledge Specification Language 95
if A > B then A
else B .
function fibonacci( N ) =
if N > 1
then fibonacci( N-1 ) + fibonacci( N-2 )
else 1 .
Launches
A launch is a procedure which can be attached to frames and is
automatically invoked whenever a new instance of that frame is created. Its
primary use is in setting up the initial characteristics of frame instances.
The directives associated with a launch are executed immediately after the
instance is created.
A launch can be tailored such that it fires only under certain circumstances.
The general format of a launch is as follows.
launch launch_name
when Instance is a new Frame
and condition(s)
then directive(s) .
launch launch_name
when Instance is a new instance of Frame
and condition(s)
then directive(s) .
The conditions are optional.
Examples
This first example will simply display a message each time a new instance of
carrier is created.
launch pick_up_new_carrier_bag
when Bag is a new instance of carrier
then write( 'I need another carrier bag ' )
and write( Bag )
and nl .
The next example executes the female_enrolment_questions
procedure each time a new instance of student is created who is female.
launch female_enrolment
when Person is a new student
and female( Person )
then female_enrolment_questions( Person ) .
flex toolkit