- [4] OWL 2 Web Ontology Language Document Overview (Second Edition) () https://www.w3.org/TR/owl-overview/
- [2] OWL 2 Web Ontology Language Structural Specification and Functional-Style Syntax (Second Edition) () https://www.w3.org/TR/owl-syntax/
- [5] OWL 2 Web Ontology Language Mapping to RDF Graphs (Second Edition) () https://www.w3.org/TR/owl-mapping-to-rdf/
- [6] OWL 2 Web Ontology Language XML Serialization (Second Edition) () https://www.w3.org/TR/owl-xml-serialization/
- [7] OWL 2 Web Ontology Language Manchester Syntax (Second Edition) () https://www.w3.org/TR/owl2-manchester-syntax/
- [8] OWL 2 Web Ontology Language Direct Semantics (Second Edition) () https://www.w3.org/TR/owl-direct-semantics/
- [9] OWL 2 Web Ontology Language RDF-Based Semantics (Second Edition) () https://www.w3.org/TR/owl-rdf-based-semantics/
- [10] OWL 2 Web Ontology Language Conformance (Second Edition) () https://www.w3.org/TR/owl-conformance/
- [11] OWL 2 Web Ontology Language Profiles () https://www.w3.org/TR/owl-profiles/
- [15] OWL 2 Web Ontology Language Data Range Extension: Linear Equations (Second Edition) () https://www.w3.org/TR/owl2-dr-linear/