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Relationships
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| Instances | Abstract | Properties or qualities as distinguished from any particular embodiment of the properties/qualities in a physical medium. Instances of Abstract can be said to exist in the same sense as mathematical objects such as sets and relations, but they cannot exist at a particular place and time without some physical encoding or embodiment. |
| | Attribute | Qualities which we cannot or choose not to reify into subclasses of. |
| | Entity | The universal class of individuals. This is the root node of the ontology. |
| | InternalAttribute | Any Attribute of an Entity that is an internal property of the Entity, e.g. its shape, its color, its fragility, etc. |
| | PhysicalState | The physical state of an Object. There are three reified instances of this Class: Solid, Liquid, and Gas. Physical changes are not characterized by the transformation of one substance into another, but rather by the change of the form (physical states) of a given substance. For example, melting an iron nail yields a substance still called iron. |
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