13. A system for identifying queries having version-intents and presenting relevant search results in accordance with such version-intents, the system comprising: a query store; and a search server comprising a query classifier; wherein the search server: receives a search query; determines that at least a portion of the search query has a version-intent indicative of a particular subject-version associated with a subject of the search query, the determining comprising: comparing terms of the search query with information stored in the query store; determining that that the compared terms of the search query has a version-intent stored in the query store; and identifying the particular subject version for the version-intent stored in the query store; presents a plurality of search results that are ranked for presentation, at least in part, based on the particular subject-version indicated by the version-intent, the presenting comprising ranking the plurality of search results based on subject-versions tags associated with the particular subject-version; and presents a user-manipulatable tool, manipulation of which permits a user to change the version-intent to be indicative of a subject-version associated with the subject of the search query other than the particular subject-version.
13. A system for identifying queries having version-intents and presenting relevant search results in accordance with such version-intents, the system comprising: a query store; and a search server comprising a query classifier; wherein the search server: receives a search query; determines that at least a portion of the search query has a version-intent indicative of a particular subject-version associated with a subject of the search query, the determining comprising: comparing terms of the search query with information stored in the query store; determining that that the compared terms of the search query has a version-intent stored in the query store; and identifying the particular subject version for the version-intent stored in the query store; presents a plurality of search results that are ranked for presentation, at least in part, based on the particular subject-version indicated by the version-intent, the presenting comprising ranking the plurality of search results based on subject-versions tags associated with the particular subject-version; and presents a user-manipulatable tool, manipulation of which permits a user to change the version-intent to be indicative of a subject-version associated with the subject of the search query other than the particular subject-version. 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.