2. Problem model
over the graph 
, a representation of cyberspace over a low-dimensional media becomes possible. Two approaches can be followed. The first is to find directly a mapping of the graph 
over the graph 
by using the local information known by each resource, i.e. the adjacency matrix. The second is to give a spatial representation of the graph 
so as to map its points in a space of a lower dimension. This mapping leads to the possibility of finding by use of a distance matrix, corresponding nodes in the graph 
.
Since we want to represent the topographical features, it is important to consider a proper scheme for representing the characteristics of the resources, defined in the graph 
, in the graph 
.