Yuri,

   Yes, but use "memberOf" instead of "in".

not Child( this memberOf p.children )

   []s
   Edson

2007/7/25, Yuri de Wit <[EMAIL PROTECTED]>:

Is it possible to do something like this with Drools 4.0?

rule
   when
      p:Parent()
      not Child( this in p.children )
   then
      ...
end

I basically dont want to keep a reference fro Child to Parent.

thanks,
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 Edson Tirelli
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