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| Instances | corps astronomique | The Class of all astronomical objects of significant size. It includes SelfConnectedObjects like planets, stars, and asteroids, as well as Collections like nebulae, galaxies, and constellations. Note that the planet Earth is an AstronomicalBody, but every Region of Earth is a GeographicArea. |
| | entit� | The universal class of individuals. This is the root node of the ontology. |
| | objet | Corresponds roughly to the class of ordinary objects. Examples include normal physical objects, geographical regions, and locations of Processes, the complement of Objects in the Physical class. In a 4D ontology, an Object is something whose spatiotemporal extent is thought of as dividing into spatial parts roughly parallel to the time-axis. |
| | physique | An entity that has a location in space-time. Note that locations are themselves understood to have a location in space-time. |
| | Star | Star is the class of hot gaseous astronomical bodies. |
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