Hi Wolfgang, Sure, I know de Morgan's laws, but I'm not asking how one can negate a condition... I'm asking how one can either negate or not negate, based on a test... and whether I'm going to have to split my spreadsheet/rule-template into 2, (i.e. 1 for "may not be" rules, 1 for "must be" rules). My spreadsheet has a field that in Java would be expressed as field ? !finalResult : finalResult But in DRL, it seems the lack of a ternary operator means I have to split my rule-set, and I'm just checking if this is the case. -Daniel -- View this message in context: http://n3.nabble.com/Negating-a-result-tp212559p212656.html Sent from the Drools - User mailing list archive at Nabble.com.

Well the thing is, it's not just one condition - it's the combination of all my rule's conditions. And my rules have about 7 conditions, none of which are mandatory. And that is actually the source of all my problems: that the conditions are optional. If I set up a few logical relationships, there is nothing specific I am testing on, which gives a single expression I can test in a function. In procedural programming, I check each of the 7 conditions optionally, and then I apply my ternary operator to the final result. But here I can't do that, because the condition is made up of all the little conditions that may or may not be applicable. PS. Ok, so I see from the other thread that a rule template is meant to place whatever text you give it, like a text pre-processor. I'll see if that is correct, thanks. I thought it might not be, because if you provide a blank cell, it deletes your entire condition, instead of providing a "" or a null, like you'd expect from a text pre-processor. -- View this message in context: http://n3.nabble.com/Negating-a-result-tp212559p212797.html Sent from the Drools - User mailing list archive at Nabble.com.