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. The OTA_AvailNotifRQ is the message that sends the notification of the availability status of a hotel. POS provides a mechanism to indicate the source of the message. The unique identifier element allows the trading partners to uniquely identify each AvailStatusMessageRQ, (i.e. the entire message) for tracing of transactions. Container for the individual AvailStatusMessage(s). An OTA_HotelAvailNotifRQ contains the availability statuses for a single hotel. Hotel identification information are the attributes of this element. The AvailStatusMessage. It is here that one indicates whether the inventory is opened, closed, closed on request, etc. The MinMaxLOSStatusMessage class communicates the set of minimum and maximum length-of-stay availability status changes to be synchronized with another system. The RateHurdleStatusMessage class defines the setting for rate hurdle controls to be synchronized with the central reservation system. This element defines standard attributes that appear on the root element for all OpenTravel Messages. Defines specific content of the message being sent.