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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. |
| | geometric figure | The class of all geometric figures, i.e. the class of all abstract, spatial representations. The instances of this class are GeometricPoints, TwoDimensionalFigures or ThreeDimensionalFigures. |
| | internal attribute | Any Attribute of an Entity that is an internal property of the Entity, e.g. its shape, its color, its fragility, etc. |
| | open two dimensional figure | The class of TwoDimensionalFigures that are not ClosedTwoDimensionalFigures. |
| | positional attribute | Attributes characterizing the orientation of an Object, e.g. Vertical versus Horizontal, Left versus Right etc. |
| | relational attribute | Any Attribute that an Entity has by virtue of a relationship that it bears to another Entity or set of Entities, e.g. SocialRoles and PositionalAttributes. |
| | shape attribute | Any Attribute that relates to the shape of an Object. |
| | structure attribute | Each subclass of StructureAttribute denotes some facet of the structure of physical entities. Each instance of StructureAttribute denotes some structural characteristic that may pertain to some Physical entity. |
| | two dimensional angle | Any two OneDimensionalFigures (i.e. straight lines) meeting at a single GeometricPoint. |
| | two dimensional figure | The class of GeometricFigures that have position and an extension along two dimensions, viz. plane figures like circles and polygons. |
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