3. The system of claim 1 wherein the identifier/retriever is arranged to identify the one or more documents by using the identifier to locate one of the first plurality of nodes by comparing the identifier and data stored with the first plurality of nodes.
3. The system of claim 1 wherein the identifier/retriever is arranged to identify the one or more documents by using the identifier to locate one of the first plurality of nodes by comparing the identifier and data stored with the first plurality of nodes. 4. The system of claim 3 wherein the node relatedness calculator is arranged to compute the distances from the located one of the first plurality of nodes to other nodes in the graphical structure.