4. The computer-implemented method according to claim 3 , wherein said utilizing step further comprises utilizing said third representation to update said count of information in the result set by determining individually whether the differences represented by said third representation represent additions or deletions of documents from said result set.
4. The computer-implemented method according to claim 3 , wherein said utilizing step further comprises utilizing said third representation to update said count of information in the result set by determining individually whether the differences represented by said third representation represent additions or deletions of documents from said result set. 5. The computer-implemented method according to claim 4 , wherein said utilizing step further comprises, for a difference represented by said third representation, incrementing said count of information in the result set if the difference represented by said third representation represents an addition and decrementing said result set count if the difference represented by said third representation represents a deletion.