20. The computer-readable medium of claim 17 , wherein applying the priority rule comprises: identifying a priority associated with the source of each document version of the plurality of different document versions; and determining the priority value for each document version of the plurality of different document versions based on the identified priority associated with the source of each document version of the plurality of document versions.
20. The computer-readable medium of claim 17 , wherein applying the priority rule comprises: identifying a priority associated with the source of each document version of the plurality of different document versions; and determining the priority value for each document version of the plurality of different document versions based on the identified priority associated with the source of each document version of the plurality of document versions. 22. The computer-readable medium of claim 20 , wherein the priority associated with a particular one of the sources is based on a reputation of the particular one of the sources.