[rules-users] "not exists MyObject" - is it a valid LHS condition?

[Olenin, Vladimir (MOH)]

Hi,

 

I wonder if the combination of 'not' and 'exists' keywords is a valid one
and therefore the construct like

 

rule "myrule"

  when 

     not exist MyObject(param matches "somepattern")

  then

     System.out.println("Object for pattern 'somepattern' doesn't exisit");

End

 

Thanks.

 

Vlad

 

PS: basically I need to trigger a rule if some set of facts is NOT found and
I need to trigger it only once.

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