Abstract PPDN, Push-Pull Distribution Network,-- a proposalfor a novel framework for peer-to-peer collaborative research network is presented. Some requirements not ad-dressed by the currently proposed systems are discussed, and we show how these issues are addressed in our frame-work. The framework is based on a distributed approach and the concept of semantic web. The collaborative networkis represented as a graph, with push and pull edges. The nodes can act as autonomous or semi-autonomous agents,implementing different policies