I think Michael Knapik wrote:
>
> So when does the agenda have all 5 rules in it such that it can be managed
> accordingly?
>
The agenda is a "to-do list." It is an ordered list of rules that have
been "activated" but not yet fired. Properly, it's not a list of rules
at all; it's a list of {rule, token} associations (a "token" is the
list of facts that match the complete LHS of a rule.) These
associations are called "activations."
You might define 100 rules, but the agenda could still be empty if
there are no facts that match those rules. If you then subsequently
assert some facts, then those activations that are created by matching
the facts to the rules are placed on the agenda; there will often be
fewer activations than rules, and there can be more than one
activation per rule.
When the engine runs, activations are removed from the agenda one at a
time and then "fired." Each time a rule fires, the agenda can change;
if Jess is being used in a multithreaded program, the agenda can
change at any time. The changes are driven by facts being added,
modified, or removed.
The (agenda) function lists all the activations on the agenda at the
time the function is called. If you call (agenda) on the RHS of a
rule, the current activation -- i.e., the association between the rule
that called "agenda" and the list of facts that made it fire -- will
already have been removed from the agenda, which hopefully helps you
to understand your observations. If you want to see all the
activations created based on a set of facts and a set of rules, you
can execute the (agenda) command from the Jess> prompt before calling
(run).
---------------------------------------------------------
Ernest Friedman-Hill
Science and Engineering PSEs Phone: (925) 294-2154
Sandia National Labs FAX: (925) 294-2234
PO Box 969, MS 9012 [EMAIL PROTECTED]
Livermore, CA 94550 http://herzberg.ca.sandia.gov
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