Let's start from a concrete example. The program below runs and
produces what I expect as output. Do you agree? Can you modify it to
produce surprising output??
(defmodule UPDATE)
(defrule UPDATE::foo
(MAIN::a)
=>
(printout t "foo" crlf))
(defrule MAIN::bar
(MAIN::b)
=>
(assert (MAIN::a))
(printout t "bar" crlf))
(defmodule CLEAN-UP)
(defrule CLEAN-UP::baz
(MAIN::c)
=>
(assert (MAIN::b))
(printout t "baz" crlf))
(reset)
(assert (MAIN::c))
(focus UPDATE)
(focus MAIN)
(focus CLEAN-UP)
(run)
I think Scott Moss wrote:
[Charset iso-8859-1 unsupported, filtering to ASCII...]
> I called, in this order,
>
> engine.setFocus("UPDATE");
> engine.setFocus("MAIN");
> engine.setFocus("CLEAN-UP");
> engine.run();
>
> from a Java program. I had understood from JIA (p.127) that I could
> push the MAIN module onto the focus stack in this way (though it would
> always be on the bottom of the stack as well). In my Jess program,
> rules firing in the MAIN module activate rules in the UPDATE module but,
> at least in some cases, the latter do not fire unless I move them to the
> MAIN module. It appears that the MAIN module ONLY gets focus last.
> This seems at odds with the JIA description -- unless, of course, I am
> doing something wrong.
>
> --
> Scott Moss
> Professor of Social Simulation
> Centre for Policy Modelling
> Manchester Metropolitan University
> Aytoun Building
> Manchester M1 3GH
>
> http://cfpm.org/~scott
>
> (t) +44 (0)161 247 3886
> (f) +44 (0)161 247 6802
> (m) +44 (0)7740 942564
>
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Advanced Software Research Phone: (925) 294-2154
Sandia National Labs FAX: (925) 294-2234
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