JESS: Matching on a base class?

[Michael Fogus]

I have theoretcial class structure of:

interface object.Shape

object.Circle implements shape
object.Square implements shape
And I have rules:

(defrule find-square
  (object.Square)
=>
  (printout t "Square" crlf)
)
(defrule find-circle
  (object.Circle)
=>
  (printout t "Circle" crlf)
)
What I'd really like to do is:

(defrule find-shape
  ?f <-(object.Shape)=>
  (printout t (call ?f getType) crlf) )
Except that I can't seem to match on an interface.

Any help would be appreciated.

-m

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