7. The system of claim 6 , wherein the set of corpora includes a set of source items of the second medium type, and wherein the performing the second-medium-type search comprises: extracting data from the set of source items; and processing the extracted data.
7. The system of claim 6 , wherein the set of corpora includes a set of source items of the second medium type, and wherein the performing the second-medium-type search comprises: extracting data from the set of source items; and processing the extracted data. 8. The system of claim 7 , wherein the extracted data includes non-textual extracted data.