| Class Summary |
| Durable | Imported. Something that last for some time. |
| Duration | Imported. An interval of time. |
| Endable | Imported. Something that have a unique start time (and optionnaly end time). |
| Event | Imported. An Event of interest, such as an ufological event (Sighting, InvestigationAct, etc.)
or a more common one (Employment, Birth, etc.).
An event can be considered as sentence stating what happened.
|
| Moment | Imported. A moment in the time.
|
| Timeable | Imported. |
| TimeLine | Imported.
A chronologicaly ordered collection of events,
with an acceptable interval of time between events.
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