7. The system of claim 1 , wherein the processor is further configured to manage priority queues for ranking the one or more documents of the document collection.
7. The system of claim 1 , wherein the processor is further configured to manage priority queues for ranking the one or more documents of the document collection. 8. The system of claim 7 , wherein the selected document is one whose score or priority queue ranking is not within a range of scores or rankings associated with a previously selected document.