flex Expert System Toolkit - LPIS

7. Knowledge Specification Language 75
Set Membership
In a similar way, sets may be incremented or decremented using the
following KSL formats.
include Item(s) in Set
remove Item(s) from Set
Note that if there is no existing current value then it is equivalent to direct
assignment, as above. An attempt to remove an item when there is no
current value will fail.
Examples
New Instances
include lemon_sole in the entree of set_meal
include { fred and mary } in the prizewinners
remove land from the whale`s habitat
remove { david and liz } from the staff
Directives can dynamically create new instances of frames with local
attributes. All other attributes of the parent frame will automatically be
inherited by the instance. The general KSL format is as follows.
Instance is a new Frame
Instance is another Frame
The whose keyword may optionally be used to create or assign values to
local attributes.
Examples
brick8 is another brick
'Tiddles' is another cat whose owner is alexander
plant33 is a new plant whose size is medium
house_2 is a new house whose bedrooms is 4
and whose floors is 2
and whose extras are { garden, garage }
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