| Comments | Comments pertaining to the orders. |
| Orders | Provides the details of one or more orders.Provides the details of one or more orders. |
| PaymentInformation | Payment information for the purchaser of the order.Details of payment. |
| RecipientInfos | Information about one or more recipients.Information about one or more recipients. |
| 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. |