Hi,
thanks for your reply Martijn. The solution should work
but is also rather inefficient because all facts would have
be stored twice. Maybe some Rete expert could argue, if such
a rule could be expressed direcly in a rete network (not considering
the specification language). If this is possible it might indicate
that just the CLIPS/JESS language is insufficient for expressing such
kind of behavior.
Kind regards,
Lars
Martijn Tromm schrieb:
Hi,
You must either keep the same data in another slot for reference like:
(C (m a b c) (m-old a b c d)) Now you can compare old and new and detect
changes between. (actually you store the mutation this way)
Or I think you have to store each object in a separate fact and keep track of
changes through activations (addition) or retractions and logical dependencies
(removal).
Regards,
Martijn
-----Original Message-----
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]
On Behalf Of Lars Braubach
Sent: dinsdag 19 februari 2008 10:34
To: [email protected]
Subject: JESS: Rules for detecting changes of a multislot
Hi,
I am trying to design a rule that is able to detect
when a single fact of a multislot is added/removed.
Given that the contained multislot values are
backed with Java objects I would also like to
know which fact has been added/removed.
(deftemplate C (multislot m))
(deffacts facts
(C (m a b c))
)
For the addition of values I could figure out
a rule that does what I want, but its unclear
to me how this could be achieved for the removal
of values. (The addition rule simply uses a pattern
(? ?fact ?) in order to generate bindings for
each element of the multislot.)
Any ideas how this could be achieved?
Kind regards,
Lars
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