The TimeRelation can be one of:
| Constant | Description | 
|---|---|
Enums. | (-1) Unknown. | 
Enums. | (0) Time extent completely overlaps the other extent. | 
Enums. | (1) Time extent starts after the start but before the end of the other extent, and ends after the end of the other extent. | 
Enums. | (2) Time extent starts before the start of the other extent, and ends before the end of the other extent. |