2. The method of claim 1 , wherein the importance rating obtained from the particular user for each of the plurality of nodes other than the particular node is obtained by receiving input from the particular user.
2. The method of claim 1 , wherein the importance rating obtained from the particular user for each of the plurality of nodes other than the particular node is obtained by receiving input from the particular user. 4. The method of claim 2 , wherein the input received from the particular user comprises a numerical importance value for each of the plurality of nodes.