Andreas,
"Not" conditional element means "Not exists"... so just do:
not InclusionDependency ( r1 == $r, a1 != $a )
[]s
Edson
Andreas Langegger wrote:
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thank you Mark.
But how can I then negate the 3rd condition?
This would mean drools cannot handle a logical forall with field
constraints by negating applying De Morgan.
How can I say, there must not be any InclusionDependency object with r1
== $r and a1 != $a?
like "! exists ( InclusionDependency ( r1 == $r, a1 != $a ) )"
thanks,
Andy
ps: sorry for the second post
Mark Proctor wrote:
You can use bound variables in an 'exists', you can't put an 'exists'
inside of a 'not'. 'exists' and 'not' can only take Fact patterns as
their children.
Andreas Langegger wrote:
Hi,
the docs say: the not yet implemented "Existential quantifiers [...] is
supported with 'not' and 'exists' conditional elements."
Hence, I tried to formulate a rule like that:
when
$r : Relation()
$a : Attribute( relation == $r )
not ( exists ( InclusionDependency ( r1 == $r, a1 != $a ) ) )
then ...
this is equiv to "forall ( InclusionDependency ( r1 == $r, a1 == $a ) )"
However, Drools doesn't allow to use BOUND VAR CONSTRAINTS together with
EXISTS, right? Can anybody help me out?
Thank you very much,
Andy
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Dipl.-Ing.(FH) Andreas Langegger
Institute for Applied Knowledge Processing
Johannes Kepler University Linz
A-4040 Linz, Altenberger Straße 69
http://www.faw.at
http://www.langegger.at
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