Wonderful! You've made my day. I'm forced to use JRules at work but I love the 
power and flexibility afforded by the more dynamic nature of JESS.

Regards,

Simon


Quoting [EMAIL PROTECTED]:

> I think [EMAIL PROTECTED] wrote:
> 
> > 
> >     if there is a (B ?a)
> >     such that ?a doesn't exist
> 
> 
> (defrule the-rule
>   (B ?a)
>   (not ?a <- (A))
>   =>)
> 
> actually works fine.
> 
> 
> 
> ---------------------------------------------------------
> Ernest Friedman-Hill  
> Science and Engineering PSEs        Phone: (925) 294-2154
> Sandia National Labs                FAX:   (925) 294-2234
> PO Box 969, MS 9012                 [EMAIL PROTECTED]
> Livermore, CA 94550         http://herzberg.ca.sandia.gov
> 
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