19. The system of claim 12 , wherein the first and second lists of query terms are represented in said computing system by an AND-OR_N tree that is processed by the software search component.
19. The system of claim 12 , wherein the first and second lists of query terms are represented in said computing system by an AND-OR_N tree that is processed by the software search component. 20. The system of claim 19 , wherein the AND-OR_N tree is traversed using an OR_N logical operation.