(called "classes") and the types of relationships permitted between them. These axioms provide semantics by allowing systems to infer additional information based on the data explicitly provided. A full introduction to the expressive power of the OWL is provided in the W3C's OWL Guide.

OWL ontologies can import other ontologies, adding information from the imported ontology to the current ontology.

Example

An ontology describing families might include axioms stating that a "hasMother" property is only present between

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