7. The method of claim 6 wherein the identifying of descriptions includes ranking phrases within the documents of a topic based on descriptiveness of the topic.
7. The method of claim 6 wherein the identifying of descriptions includes ranking phrases within the documents of a topic based on descriptiveness of the topic. 8. The method of claim 7 wherein the ranking of phrases includes: ranking two-word phrases within the documents; selecting high ranking two-word phrases; and repeatedly extending the selected phrases based on the ranking of the extended phrases.