All Schema files in the OpenTravel Alliance specification are made available according to the terms defined by the OpenTravel License Agreement at http://www.opentravel.org/Specifications/Default.aspx. This message supports the functionality of updating other systems with reservation data. The message assumes a push model, with the originating system pushing the data to another system. The originating system would usually be a booking source, such as a Global Distribution System (GDS), a Central Reservation System (CRS) or some other agent of the hotel. The point-of-sale data, contained in the element, communicates the information that allows the receiving system to identify the trading partner that is sending the request or the response message. This represents a batch ID. A collection of hotel reservations. The time until a hold is released.