Type: Sorting - Sort column and direction

Field	Meaning
descending	Specifies the sorting direction. This member does only have an effect if a sorting key (column) is provided as well. (optional) If "true", results will be sorted in descending order. If "false" they'll be sorted by ascending order
key	Specifies the column you want to sort for (optional) Possible values: age (sort by article age) artnum (sort by article number) body_colorgroup_id (sort by color) price (sort by price) fuel_id (sort by fuel) hits (sort by hits) leasingfinance (sort by leasing pirce) brand_id (sort by make) mileage (sort by mileage) kilowatt (sort by kilowatt power) pubstart (sort by insertion start) year (sort by day of registration) zip (sort by zip code)