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 provides the capability of requesting the rules and usage requirements (either all or for a specific rule category) of a rate for a specific hotel property. The request may be per room type, booking code, check in/out dates, or by confirmation number for a previously booked reservation. POS provides a mechanism to indicate the source of the message. Specifies the hotel chain and property for which booking rules are requested. Specifies the check in and check out dates, booking code, room type code, and corporate discount number for the booking rules requested. The number of rooms for this inventory type code. Specifies the number of adults and children per room. The hotel confirmation number for which the booking rules are requested. A collection of rule categories. A specific rule category. The name of the rule category. The rule category number. This element defines standard attributes that appear on the root element for all OpenTravel Messages.