| direct-children | documentation | graph |
| Entity | 15522 | The universal class of individuals. This is the root node of the ontology. | ^ |
| Physical | 9105 | An entity that has a location in space-time. Note that locations are themselves understood to have ... | ^ |
| Object | 6092 | Corresponds roughly to the class of ordinary objects. Examples include normal physical objects, geo... | ^ |
| Collection | 714 | Collections have members like Classes, but, unlike Classes, they have a position in space-tim... | ^ |
| ContentBearingPhysical | 2049 | Any Object or Process that expresses content. This covers Objects that contain a Propositio... | ^ |
| Process | 1439 | The class of things that happen and have temporal parts or stages. Examples include extended events... | ^ |
| PhysicalSystem | 26 | PhysicalSystem is the class of complex Physical things. A PhysicalSystem may have one or more... | ^ |
| FinancialAsset | 29 | Any item of economic value owned by an individual or corporation, especially that which could be co... | ^ |
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