**Individuals, Classes, Attributes, Relations, Etc** Most ontologies use the same basic set of components. The first four are the "main" ones. - Individuals - Instances of a class[^1] - Classes (or "kinds") - A kind of thing that can have properties (nouns) - Attributes - Properties that members of a class can have - Relations - How classes or individuals can relate to others - Restrictions - What must be true about something to be valid - Rules/Axioms - Logical statements describing inferences that can be made - Events - Changing of attributes or relations **** # More ## Source - [Ontology components - Wikipedia](https://en.wikipedia.org/wiki/Ontology_components) ## Related - [[Ontology]] - [[Ontology, Semantics, and Syntax]] - [[Ontology Language]] - [[Protege]] [^1]: although some research has lead me to think this isn’t well controlled; or perhaps just the usage of “individuals” within an ontology is either open for debate or I’m just not clever enough to wrap my brain around it. One source showed `Ford Broncho` as an individual of a `4-wheel drive` class. It seems likely that there isn’t just one “right” way to do things. That’s not how I would do it, though.