5. The method as claimed in claim 1 , wherein the computer program product further comprises executable instructions that, when read and executed by the computer, causes the computer to: perform a depth-first search in the citation network represented by the established semantic links between documents; and retrieve forward-chained and backward-chained reasons-for-citing and headnotes based on a starting reason-for-citing representing a specified citation.
6. The method as claimed in claim 5 , wherein the computer program product further comprises executable instructions that, when read and executed by the computer, causes the computer to display a digest window for allowing a user to view other issues discussed in each document and to transition the display to one of the other issues in the form of a new user-interactive sub-network.