2. A method as recited in claim 1 , wherein the first entity and the second entity are specified in a query issued by the user.
2. A method as recited in claim 1 , wherein the first entity and the second entity are specified in a query issued by the user. 11. A computer-readable storage medium carrying one or more sequences of instructions which, when executed by one or more processors, causes the one or more processors to perform the method recited in claim 2 .