| CruiseLinePrefs | Collection of cruise line preferences. |
 Guest | Specifies guest names and/or their transportation.Provides information regarding the guest name and the guest's mode of transportation. |
| GuestCounts | Specifies guest quantity and guest types.Specify guest numbers and types. |
| MultimodalOffer | Multimodal offer influencers.Traveler and trip information used for targeted multi-modal offers. |
 POS | Point of sale object.Point of Sale (POS) identifies the party or connection channel making the request. |
| RegionPref | Specifies geographical region to include in the response. |
| SailingDateRange | Specifies sailing availability start and end dates as well as cruise duration. |
| 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. |
| 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. |
| MaxResponses | A positive integer value that indicates the maximum number of responses desired in the return. |
| MoreDataEchoToken | A reference to the last response returned. Originally set in the response message and will be used in the next query for more details. |
| MoreIndicator | If true, this indicates more items are available. If false, no more items are available. |