| ItemValueType | Item value type |
| NumberOfTimeSteps | Number of time steps in grid file |
| Quantity | Quantity in grid file |
| StartTime | Start time of data in grid file, for grids with calendar type time axis |
| TimeStep | Time step size in seconds in grid file, for equidistant type time axis |
| TimeType | Time step type in grid file |
| XCount | Number of elements in x direction |