Let me be more precise in what I mean. Obviously, one can imagine all kinds of traffic conditioners, and some of them will perform flow analysis before they mark, shape or police the traffic. It's very important that we write PHB specs that require no information beyond what is contained in the DS Field and what is configured in the router by policy mechanisms. The short way to say that is that diffserv doesn't know anything about flows. That's why he made his statement.
Nothing called diffserv knows anything about per-flow anything.