20. A method, comprising: determining a value for an object included in a plurality of objects in a database, the value for the object being based at least in part on that object being referenced by links from others of the plurality of objects having a keyword and on link type information associated with the links; determining another value for the object based at least in part on objects containing the keyword; and ranking, on a computing device, the objects based at least in part on the determined values; wherein the database is modeled as a labeled graph, including nodes and edges, wherein the objects comprise nodes in the labeled graph and the links comprise edges in the labeled graph, and wherein the determining the value for the object comprises determining a flow of authority among the nodes along the edges, the flow of authority being derived at least in part from different authority transfer rates assigned to the edges based at least in part on edge type schema information, wherein the authority transfer rates depend on semantic meanings of edge types.
20. A method, comprising: determining a value for an object included in a plurality of objects in a database, the value for the object being based at least in part on that object being referenced by links from others of the plurality of objects having a keyword and on link type information associated with the links; determining another value for the object based at least in part on objects containing the keyword; and ranking, on a computing device, the objects based at least in part on the determined values; wherein the database is modeled as a labeled graph, including nodes and edges, wherein the objects comprise nodes in the labeled graph and the links comprise edges in the labeled graph, and wherein the determining the value for the object comprises determining a flow of authority among the nodes along the edges, the flow of authority being derived at least in part from different authority transfer rates assigned to the edges based at least in part on edge type schema information, wherein the authority transfer rates depend on semantic meanings of edge types. 22. The method of claim 20 wherein the ranking of the objects occurs in response to a query including the keyword.