26. The method of claim 1 , wherein the certain operations comprise a fourth set of one or more operations that are to be performed on a second data source; and wherein the markup language data source is separate from the second data source.
26. The method of claim 1 , wherein the certain operations comprise a fourth set of one or more operations that are to be performed on a second data source; and wherein the markup language data source is separate from the second data source. 57. A machine-readable storage medium storing 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 26 .