JESS: Working with Exceptions

[Mrinal Khanvilkar]

Hi,

Does anyone know how to catch exceptions in a RULE .
I mean like

(defrule someRule
   "comment"
   (Callhome (thing1 ?a)(thing2 ?b))
   (try (< ?a ?b)catch (printout t "they need to be integers" crlf))
   (test(eq ?b TRUE))
   =>
       (printout t "done" crlf)
       )

in the above case the engine throws me an exception when ?a and ?b happen to
be strings and then it doesnt fire the remaining rules.
i dont want that. Instead i would want the engine to just ignore this rule
if ?a ?b are strings.
can this be done.?

Regards,
Mrinal