21. The data processing system product as claimed in claim 20 , wherein the visual indication of the frequency of occurrence of the at least one query term in the first format comprises a visual indication of the frequency of occurrence of each of the query terms, and compressed visual indication of the frequency of occurrence of the at least one query term in the second format comprises a compressed visual indication of the frequency of occurrence of each of the query terms.
20. The data processing system product as claimed in claim 19 , the search query comprises multiple query terms, and each modified document surrogate in the result list comprises an indication of a frequency of occurrence of each query term of the search query in the document surrogate.