The operations "thousandFive" and "incrementEmployeeSalaryEx" are used in demonstrating the query result export functionality in a data service. The query used in "thousandFive" operation exports the a result value with the name "increment". This increment value is taken in as a parameter by the query in the "incrementEmployeeSalaryEx" operation.
The figure below shows the dbs fragment that defines this behaviour:
The return values from the first "employeeByNumber()" call and the second have a difference of 1500, which is the amount incremented within the boxcarring session. The 1500 value is passed into "incrementEmployeeSalaryEx" operation by the "thousandFive" operation.