12. The system of claim 11 , wherein the flow of authority is derived at least in part from different authority transfer rates assigned to the edges based at least in part on edge type schema information of the graph.
12. The system of claim 11 , wherein the flow of authority is derived at least in part from different authority transfer rates assigned to the edges based at least in part on edge type schema information of the graph. 17. The system of claim 12 , wherein the graph represents a database having a structural relationship among the nodes defined by semantic contents of the database, and the object rank module is configured to optimize calculation of the multiple initial rankings based at least in part on the structural relationship among the nodes.