The Web Ontology Language OWL has no standardized visual notation in contrast to related modeling languages. However, the visual representation of individual and combined OWL elements as well as complete OWL ontologies can be very useful in many cases. We have developed the Visual Notation for OWL VOWL that defines graphical representations for most of the OWL language constructs. In contrast to related work, VOWL aims at a complete and well-specified notation that is easy to understand and implement. This paper reports on the current state of development and briefly describes the main design principles and considerations. At OWLED 2015, we conducted a special session to gather feedback on how to further improve the visual notation and to collect requirements for its future development.
['Steffen Lohmann', 'Florian Haag', 'Stefan Negru']
Towards a Visual Notation for OWL: A Brief Summary of VOWL