You are correct, the patterns in the LHS of a rule are treated as being
ANDed together. To create an OR condition, you could use two or more
separate rules. Instead of:
Jess> (defrule cantDoThis (test (or (this ?) (that ?))) => (assert
(thisandThat)))
Rete Exception in routine ReteCompiler::eval.
Message: Unbound variable found in funcall: _blank_2 at line 1: (
defrule cnatDoThis ( test ( or ( this ?_blank_2 ) ( that ?_blank_3 ) ) ) = >
( assert ( tat ) ) ) .
at java.lang.Throwable.fillInStackTrace(Native Method)
at java.lang.Throwable.fillInStackTrace(Compiled Code)
at java.lang.Throwable.<init>(Compiled Code)
....
Jess> (assert (this Z))
<Fact-0>
Jess> (assert (that V))
<Fact-1>
Jess> (facts)
f-0 (this Z)
f-1 (that V)
For a total of 2 facts.
TRUE
Jess> (defrule thisRule (this ?) => (assert (thisandThat)))
TRUE
Jess> (defrule thatRule (that ?) => (assert (thisandThat)))
TRUE
Jess> (run)
TRUE
Jess> (facts)
f-0 (this Z)
f-1 (that V)
f-2 (thisandThat)
For a total of 3 facts.
TRUE
Jess>
Opinions are strictly those of the author and
do not necessarily reflect those of GRCI.
____________________________________________
Lewis Hart GRC International
703-506-5938 1900 Gallows Rd
[EMAIL PROTECTED] Vienna, VA 22182
-----Original Message-----
From: Message UK [mailto:[EMAIL PROTECTED]]
Sent: Sunday, July 18, 1999 4:32 PM
To: [EMAIL PROTECTED]
Cc: [EMAIL PROTECTED]
Subject: JESS: OR and AND in rules
Hi all. I would like to be able to use an OR in a rule, like "if this is the
case" OR "this is the case" then fire rule X.
In some rules I have listed several conditions, which I have assumed works
as an AND:
(defrule worried_AIDS
>> ?u <- (user(hiv_status "pos"))
>> ?e <- (enquiry (type G3)(value "done"))
=>
...etc...
is that right? is it ANDed? How do I do an OR? (if it's possible)? And if
the above is in fact an OR, how do I do an AND??!!
Tres thanks. Debbie Lampon
______________________________________________________
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