Sorry, I used the wrong terminology. I meant "facts"
trigger rules, not rules trigger rules.
Let me rephrase my question a little bit. Suppose
there are three rules:
a) (defrule rule1
?fact <- (Test (a 0))
=>
(modify ?fact (a 1)))
b) (defrule rule2
?fact <- (Test (b 0))
=>
(modify ?fact (b 1)))
c) (defrule rule3
?fact <- (Test (a 1) (b 1))
=>
(modify ?fact (c 1)))
The syntax of the above rules may have some problems,
but let's forget about the syntax and just use the
example to illustrate the problem.
At the beginning we have one fact in which the three
fields a, b, and c are equal to 0. The execution order
of the above rules will be either a) b) c) or b) a)
c). Rule c) will be placed in the agenda only when
both field a and b are set to 1. But an eventing
mechanism will only capture the last rule that cause
rule c) to be activated. In this example, if we start
from c) to trace back, we will only capture either b)
or a), not both.
This is a bit confusing but I hope the example helps
me explain the question.
p.s. If the above explanation makes it even more
confusing, could you comment on Jess's explanation
capability in general? thanks.
--- [EMAIL PROTECTED] wrote:
> Rules don't trigger rules; facts do. You can keep
> track of what rule
> asserted (or last modified) every fact, and this
> gives you the set of
> rules that contributed to activating each other
> rule. I really
> couldn't follow the whole rest of your discussion
> because it was based
> on some invalid assumptions.
>
> > When the rule that we're interested in is
> violated, it is hard to
> > backward-trace its causes at that time.
>
> If you keep track of what rule asserted what fact,
> then at any time,
> working backwards, you can generate an execution
> trace for any rule
> that fires.
>
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