Abstract: A method includes receiving, at a device, a first file including a plurality of elements. The first file is represented in a markup language and complies with an inventory availability format. The method also includes receiving, at the device, a second file that indicates linkage between multiple elements of the first file. The method further includes generating, at the device, a graphical user interface (GUI) indicating the linkage between the multiple elements. The GUI includes at least one option that is selectable to initiate performance of an aggregate operation on the multiple elements. The method also includes providing the GUI from the device to a display. Other aspects are also disclosed.