• A family of knowledge representation languages for authoring ontologies. Ontologies are a formal way to describe taxonomies and classification networks, essentially defining the structure of knowledge for various domains: the nouns representing classes of objects and the verbs representing relations between the objects. The OWL languages are characterized by formal semantics. They are built upon the World Wide Web Consortium’s standard for objects, the Resource Description Framework (RDF). ← Wikipedia ↑ w3.org/TR/owl2-overview

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