| FareRestriction | Identifies the type of fare restriction, such as None, Advance Purchase and Change Penalties. Refer to OpenTravel Code List Fare Restriction (FAR). |
| PreferLevel | Used to indicate a level of preference for an associated item. |
| RefundableInd | If true, refundable fares are preferred. |
| Duration | The duration datatype represents a combination of year, month, day and time values representing a single duration of time, encoded as a single string. |
| End | The ending value of the time span. |
| Start | The starting value of the time span. |