Drools 3 will have Not built in. Not sure if that helps !
On 1/17/06, Peter Van Weert <[EMAIL PROTECTED]> wrote: > > Hi, > > I was wondering what your opinions are on the necessity of negative > conditions in production rules? The reason I am interested is that I am > currently developing a Java embedding of a rule-based programming > language myself, with similar expressive power as the current Drools > language (i.e.: forward chaining rules without negative conditions). I > am pleased to see a system as Drools became this popular and widely used > and accepted without support for negative conditions. It strengthens my > feeling that a language could do without (and without the complexities > of implementing it efficiently...). > > So, the main question for the discussion I am hoping to get started here > (probably you've had it before somewhere, in which case a summary of the > outcomes would be much appreciated): are negative conditions necessary? > Are they missed in practice a lot? > > Disclaimer: http://www.kuleuven.be/cwis/email_disclaimer.htm > >
