38. The system as claimed in claim 33 , wherein the number resource clusters in each level of said hierarchy is determined by content of resources, each resource cluster determines the number of sub-clusters generated from the resource cluster in the immediately inferior level of the hierarchy.
38. The system as claimed in claim 33 , wherein the number resource clusters in each level of said hierarchy is determined by content of resources, each resource cluster determines the number of sub-clusters generated from the resource cluster in the immediately inferior level of the hierarchy. 39. The system as claimed in claim 38 , wherein the number of levels of said hierarchy is determined by content of said information resources.