34. The computer-readable medium of claim 33 , wherein the computer-executable instructions are operable to cause the one or more machines to perform operations further comprising: receiving the query, the query including multiple keywords; wherein the determining comprises generating multiple initial rankings corresponding to the multiple keywords, each of the multiple initial rankings indicating authority of the nodes with respect to each respective keyword; and wherein the generating the keyword-specific ranking comprises combining the multiple initial rankings.
34. The computer-readable medium of claim 33 , wherein the computer-executable instructions are operable to cause the one or more machines to perform operations further comprising: receiving the query, the query including multiple keywords; wherein the determining comprises generating multiple initial rankings corresponding to the multiple keywords, each of the multiple initial rankings indicating authority of the nodes with respect to each respective keyword; and wherein the generating the keyword-specific ranking comprises combining the multiple initial rankings. 40. The computer-readable medium of claim 34 , wherein the digital information comprises a database having a structural relationship among the nodes defined by semantic contents of the database, and the generating the multiple initial rankings comprises setting initial conditions for iterative processing based on the semantic contents and stored values for a subset of the nodes.