Like an airplane route, each vendor in the DART system has an inventory of seats available for each trip that they run. By explicitly modeling this inventory of available seating as products in OFBiz with associated costs Brainfood proposed to leverage the pre-existing order and payment processing capabilities of the OFBiz system. The primary difference lies in how inventory is allocated to an order.
In the DART transit system Brainfood proposed that the main difference from a normal inventory system will be the inventory selection method. In a typical warehouse, inventory is simply allocated in a FIFO (first in, first out) or LIFO (last in, first out) manner. OFBiz already provides a method for inventory selection methods to be “pluggable”, even on a product by product basis.