I think we have to acknowledge that the Security Council is a very political place. Sometimes it votes one way, sometimes it votes another. Putting the criteria into a treaty hopefully takes some of the politics out of it. I don't think you can ever take the politics completely out, but that's our goal.
So what would then be assessed in a conflict like Libya is who were the arms being sold to, and what is their conduct? There would be this set of criteria that would interact, and that would be the judgment. So it's not merely.... An embargo often picks one side or another, sometimes both. What we're trying to do here is say look at the situation, look at what's going on, and who is the end user of whatever it is you are trying to sell? That's the fundamental difference that would happen in a treaty setting.
Ken may want to add to that.