The Visual Notation for OWL Ontologies (VOWL) defines a visual language for the user-oriented representation of ontologies. It provides graphical depictions for elements of the Web Ontology Language (OWL) that are combined to a force-directed graph layout visualizing the ontology.
This specification focuses on the visualization of the ontology schema (i.e. the classes, properties and datatypes, sometimes called TBox), while it also includes recommendations on how to depict individuals and data values (the ABox). Familiarity with OWL and other Semantic Web technologies is required to understand this specification.
A color-coded symbol language for diagramming OWL and RDF ontologies and vocabularies, including Classes, Properties, Literals, Dataypes, Unions, Intersections, externally-defined terms, equivalent terms, etc.