Case 2: For facts containing a single slot, the slot name is usually synonymous with the relation name.(time (value 8:45))can be changed to(time 8:45)ĬONSTRUCT Is-a DEFTEMPLATE IS-A Is-a IMPLIED DEFTEMPLATE EXPLICIT DEFTEMPLATE FACT Creates Is-a Creates Is-a Is-a ORDERED FACT DEFTEMPLATE FACT (deftemplate person (multislot name) (slot age) (slot eye-color) (slot hair-color)) Is-a Is-a (number-list 7 9 3 4 20) (person (name John Q.

Case 1: Facts consisting of just a relation name are useful as flags and look identical regardless of whether a deftemplate has been defined.(all-orders-processed).

Whenever CLIPS encounters an ordered fact it automatically creates an implied deftemplate for that fact (as opposed to an explicit deftemplate, created using the deftemplate construct).Įxample:(number-list 7 9 3 4 20)is equivalent to defining(deftemplate number-list (multislot values))and then defining the fact as(number-list (values 7 9 3 4 20)).

Facts with a relation name that does not have a corresponding deftemplate are called ordered facts.

Facts with a relation name that has a corresponding deftemplate are called deftemplate facts.

Public) (age 23) (eye-color blue) (hair-color brown)) Multislot

Which specified with multislot keyword are allowed to contain zero or more values.ĭefining “person” factwith multislot (deftemplate person “An example deftemplate” (multislot name) (slot age) (slot eye-color) (slot hair-color)) Specifying multislot (person (name John Q.

Slots of a fact that have been specified with the slot keyword in their deftemplates are allowed to contain only one value.

Public”) (age 23) (eye-color blue) (hair-color black)) The fact following the format of “person” template

Format: (deftemplate *) : (slot | ( multislot )ĭefining “person” fact (deftemplate person “An example deftemplate” (slot name) (slot age) (slot eye-color) (slot hair-color)) The “person” template (person (name “John Q.

Analogous to a record structure in Pascal.

Defining the list of valid slots for a given relation name.

Public”) (age 23) (eye-color blue) (hair-color black)) The order in which slots are specified is irrelevant.

Facts consists of a relation name followed by zero or more slots and their associated values.A “chunk” of information in CLIPS is called a fact.Expert Systems Chapter 7 Introduction to CLIPS

Multislot loop in CLIPS