As described in the ATG Merchandising Guide for Business Users, Oracle ATG Web Commerce Search can perform customized rankings and other adjustments to the search using rank configuration. This process can also be performed for the item results. At query time, Search can control which configuration to use with the following attribute:

<query rankConfig="name"

The name value must be the name of a ranking configuration loaded into the index. If no value is given, no ranking adjustments are made.