Tray		Contains modules to run.

name		Name to refer to tray.

parameters	Parameters to config tray.
modules		Modules to run in tray. See ##Module##
classes		Classes used by tray. See ##Class##
resources	Resources used by tray. See ##Resource##
iterations	Number of times to run tray. The current run index is stored in parameters.tray_iteration
data		Data used by tray. See ##Data##