  The Peer-to-Peer systems (P2P) were led these last years as the major
technology of access upon various resources on Internet. These systems build a
cluster witch contains a very large number of peers. As the result the
selection of peers who can answer for a given query is a very difficult
problem. The efficiency of the selection algorithms can be improved by
introducing of semantics into the process of queries routing. We present in
this paper a novel improved version of our semantic routing algorithm
LearningPeerSelection (LPS) presented in CORIA 2009, an incremental strategy of
updating knowledge bases and an advanced experimental study. To test the
proposed algorithm, we defined a layer of routing on the PeerSim simulator.
