| ConfID | A confirmation number by which this reservation can be uniquely identified.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). |
| ContractID | A contract number by which this rental can be uniquely identified.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). |
| Customer | This is the rental customer's information.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. |
| Fee | Defines information on a specific charge associated with the rental of a vehicle along with the purpose of the charge (e.g. pre-paid fuel). This does not include insurance (see priced coverages).The VehicleChargePurposeType complex type defines information on a specific charge associated with the rental of a vehicle along with the purpose of the charge. |
| PickUpReturnDetails | Typically this is used to provide the actual return date, time, and location.The VehicleRentalCoreType complex type identifies the data that is common, or core, to almost every transaction associated with the rental of a vehicle. |
 POS | Describes the source of the transaction such as kiosk id or counter agent id.Point of Sale (POS) identifies the party or connection channel making the request. |
| PricedCoverage | This is used when a requestor wishes to override the published price. If the price is not known or will not be overriden, a CoveragePref is used.The CoveragePricedType complex type defines the information that is required to describe a priced coverage, that is, a coverage and a charge. |
| RateQualifier | Indicates the type of rates of interest to the customer, along with any discount number or promotional codes that may affect the rate. |
| Remarks | A collection of remarks. |
| RentalPaymentAmount | This element may reflect a charge or reserve to a form of payment. |
| RentalRate | Information on the rates associated with this vehicle. Rate information can include the distance and the base rental cost, along with information on the various factors that may infuence this rate.This describes time, mileage and other charges. |
| SpecialEquipPrefs | Collection of special equipment preferences. |
| VehDetailsOut | Details of the Vehicle that needs to be checked out for the customer who is renting the vehicle.This provides specific information regarding the milage and condition of the vehicle being rented. |
| VehIdentity | The specific identifiers of the vehicle (e.g., Motor Vehicle Asset Number). |
| VehMakeModel | The make and model of the vehicle (e.g., Ford Focus). The Code attribute may be used for the SIPP code. |
| 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. |
| VehRentalAdditionalInfo | Identifies the supplemental information associated with the request for the checkout of a rental vehicle.Identifies the supplemental information that may be included when requesting the reservation of a vehicle. |
| VendorPref | Identifies a preferred company by name.Identifies a preferred company by name. |
| AltLangID | The alternate language for a customer or message encoded as ISO 639-3. |
| CorrelationID | Allows end-to-end correlation of log messages with the corresponding Web service message throughout the processing of the Web service message. |
| EchoToken | A reference for additional message identification, assigned by the requesting host system. |
| PrimaryLangID | The primary language preference for the message encoded as ISO 639-3. |
| RetransmissionIndicator | When true, indicates the message is being re-sent after a failure. |
| SequenceNmbr | The sequence number of the transaction assigned by the sending system for ordered message processing or message resynchronization. |
| Target | Test or Production target system indicator. |
| TargetName | The name of the Test or Production system. |
| TimeStamp | ISO 8601 encoded timestamp indicating the creation date and time of the message. |
| TransactionIdentifier | Unique identifier to relate all messages within a transaction (e.g. this would be sent in all request and response messages that are part of an on-going transaction). |
| TransactionStatusCode | This indicates where this message falls within a sequence of messages. |
| Version | The OpenTravel message version indicated by a decimal value. |
| RentalActionCode | Identifies the reason for the transaction. To specify the type of action requested when more than one function could be handled by the message. |
| RentalAgreementStatusCode | This is a code that represents the status of the rental agreement. Refer to the enumerated list and annotations for additional information. |
| ReqRespVersion | Used to request the version of the payload message desired for the response. |