To at least *detect* bad slot values consider setting up suitable rules that
throw an exception, or whatever. The task of generating these
straightforward rules can be automated with a userfunction. You might then,
for instance, write
(deftemplate SrcTemp (slot destFact))
(deftemplate
Is there a way in Jess to constrain the values of a slot of a template
to be instances of another template? For instance, consider the following
template for a city:
(deftemplate city
(slot county)
(slot population)
(slot coordinates))
We would like the values of the slot location to be
You can't *constrain* the type, but you can hold facts in the slots
of other facts. Just use the fact object (fact-id) itself:
(bind ?gl (assert (geographical-location (latitude 20) (longitude 40
(assert (city (county Middlesex) (population 10) (coordinates ?gl)))
On Aug 6, 2007, at
