Hi!
I don't think it's a bug (at most a feature ;-)
With only Rule1 in place I would not expect the (not) CE to start backward
chaining, either. You can make it work by first issuing the following
statement, though:
(expand (assert (fsm-select (need-Coord))))
That statement will make the Fact Storage Provider Framework preload all
Coord records.
Thomas
Hello jess users,
I use the Fact Storage Provider Framework to connect Jess with a database.
The database contains these tables:
Table "Data"
ID integer
PathToImage String
Table "Coord"
ID integer
UpperRightX
UpperRightY
where Data.ID and Coord.ID are the same.
(fsm-do-backward-chaining Coord)
(defrule Rule1
; try to find which images have NO entry in the Coord table
(Data (ID ?id) (Path ?path) (Media ?mediaID))
(not (Coord (ID ?id)))
=>
(printout t "Pas de coordonnees pour l'image numero " ?id crlf))
Rule1 fires for all images (georefenced or not) in the Data table. It looks
like the backward chaining is not done when it is inside a (not).
This could be a design choice. But things become inconsistant when Rule2
is
added.
(defrule Rule2
; try to find which images HAVE an entry in the Coord table
(Data (ID ?id) (Path ?path) (Media ?mediaID))
(Coord (ID ?id))
=>
(printout t "Coordonnees existent pour l'image numero " ?id crlf))
If Rule2 is added, Rule1 fires for non-georeferenced images and Rule2 fires
for georeferenced images.
Is this a bug?
-Kami
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