65. The machine-readable storage medium of claim 64 , wherein the one or more sequences of instructions further comprise instructions which, when executed by the one or more processors, cause the one or more processors to perform the step of determining to use the particular candidate identification technique to process the query at least in part by reading an indication that indicates which candidate identification technique, of two or more candidate identification techniques available to a query-processing unit, to use to process the query.
66. The machine-readable storage medium of claim 65 , wherein the instructions that cause reading the indication comprise instructions which, when executed by the one or more processors, cause the one or more processors to perform the step of obtaining the indication from a configuration file.