2. The method of claim 1 , the method further comprising: generating a first reference to the first set identifier, generating a second reference to the fourth set identifier, and creating a targeted unrefinement comprising an unrefiner that relates a first audience to the first reference and a second audience to the second reference.
2. The method of claim 1 , the method further comprising: generating a first reference to the first set identifier, generating a second reference to the fourth set identifier, and creating a targeted unrefinement comprising an unrefiner that relates a first audience to the first reference and a second audience to the second reference. 3. The method of claim 2 , the method further comprising: characterizing a set of authors, specifying a mapping from the first and second set identifiers to the targeted unrefinement, and using an unrefinement rule that restricts the second audience to the second reference for the set of authors.