| Applicability | Indicates a time or a place of reference (e.g. before pick-up, drop-off location). |
| MaxQuantity | This is used in conjunction with UnitName to specify the maximum quantity of units as defined by UnitName. |
| Percentage | Provides the ability to define a particular percentage. |
| Quantity | This is used in conjunction with UnitName to specify the quantity of units as defined by UnitName (e.g., if Quantity="5" and UnitName="day" the result is 5 days). |
| Total | The total for a specific item in a calculation. |
| UnitCharge | This is used in conjunction with UnitName to specify the charge per unit as defined by UnitName (e.g., if UnitCharge="100" and UnitName="day" the result is 100 dollars per day). |
| UnitName | The UnitName attribute provides the unit on which an item charge may be based when purchasing a round of golf. |