| Customer | Information on the one primary driver and, optionally, several additional drivers. This may be used to provide a frequent renter number.Information on the one primary driver and, optionally, several additional drivers. This may be used to provide a frequent renter number. |
 DriverType | Indicates the number of people of each age category associated with this request. |
| RateDistance | Information on the distance that a reserved vehicle may be driven as part of the standard rental charge. Such distance may be unlimited, or a quantity of miles or kilometers for a certain period of time. This may be repeated for situations such as an 8 day rental that has 500 miles per week and 100 miles per additional day. |
| RateQualifier | Indicates the type of rates of interest to the customer, along with any discount number or promotional codes that may affect the rate. |
| RateRestriction | Information on restrictions that may be associated with this rate. |
| SpecialEquipPrefs | Indicates the preferences for one or more specific items of additional equipment, such as ski racks, child seats, etc. |
| TotalCharge | Total cost for this reservation. |
| TPA_Extensions | A placeholder in the schema to allow for additional elements and attributes to be included per Trading Partner Agreement (TPA).Allows extensions to be added to the OpenTravel specification per trading partner agreement. |
| UniqueID | A unique identifier by which to reference the reservation. This is typically referred to as a reservation number.An identifier used to uniquely reference an object in a system (e.g. an airline reservation reference, customer profile reference, booking confirmation number, or a reference to a previous availability quote). |
| VehicleCharge | Information on the charges associated with this vehicle.The VehicleChargePurposeType complex type defines information on a specific charge associated with the rental of a vehicle along with the purpose of the charge. |
| VehPref | Indicates any preferences for the vehicle, such as type, class, transmission, air conditioning.The VehiclePrefType complex type defines the information that is used when defining a preference of a vehicle. |
| VehRentalCore | Information that is common, or core, to all requests and responses associated with the reservation of a vehicle.The VehicleRentalCoreType complex type identifies the data that is common, or core, to almost every transaction associated with the rental of a vehicle. |
| VendorPref | Indicates the preferred Vendor Company for car rental. If a company name is supplied, the rates will be supplied for the specific Vendor Company. The company name is unique amongst the vendors. The name of the company is provided in this element.Identifies a preferred company by name. |
| Action | Identifies an action (add, delete, replace, etc.) to be taken on the information in the child elements.Identifies an action to take place. |
| IndexNumber | A unique number (e.g., segment number or index number) used to further identify a booked item within a list of booked items in a multi-segment PNR. Typically not used in messages to car suppliers. |
 ModifyType | Used to specify the status of the reservation with either one of the enumerations in TransactionActionType or an UpperCaseAlphaLength1to2 such as the IATA status code. |
| OptionChangeIndicator | When true, indicates that critical options have changed since the reservation was made or modified. |
| Status | |
| TransactionType | Used to specify the action that should be taken on the customers pending reservation.To specify the type of action requested when more than one function could be handled by the message. |