4. The method of claim 2 , wherein the first search is performed using ranking criteria based on the query data, but not the context vector; wherein the second search is performed using ranking criteria based on at least the context vector.
4. The method of claim 2 , wherein the first search is performed using ranking criteria based on the query data, but not the context vector; wherein the second search is performed using ranking criteria based on at least the context vector. 18. One or more storage media storing instructions which, when executed by one or more processors, causes performance of the method of claim 4 .