| ListOfParentRPH | Where an option is applicable only to certain passengers, this attribute will contain the ReferencePlaceHolders of the relevant passengers. |
| RuleCode | Further clarifies how this extra is applied to a group of extras.Specifies the type of linked extras allowed : OneOf (only one of the linked extras may be booked) or AnyOf (any or all of the dependants may be booked |
| SelectionType | Describes how the extra is applied to a group of extras, e.g. "Mandatory" and "Optional."Used to indicate whether an Extra must be booked (Mandatory), may be requested (Optional) or included automatically but may be removed (Removeable). |