16. The system of claim 13 , wherein the search server is in communication with a document index, and the document index associates search results in the document index having a known subject-version association with a subject-version tag indicative of the subject-version of the search result.
16. The system of claim 13 , wherein the search server is in communication with a document index, and the document index associates search results in the document index having a known subject-version association with a subject-version tag indicative of the subject-version of the search result. 18. The system of claim 16 , wherein the document index is configured to store keyword-based classification information about the search results.