Graphical Notations developed for RDF and OWL
As a modelling language, it is important for OWL to have a graphical notation.
This is not to be confused with the broader area of ontology visualization, which potentially caters for a vast array of views and graphical editing facilities.
A graphical notation is simply a graphical alternative to the other OWL syntaxes.
UML Profiles for RDF and OWL have been developed as part of OMG's Ontology Definition Meta Model (ODM).