Ontology models in zAgile Teamwork are expressed here in UML. Please note that UML is not total compatible with OWL 1.1, therefore, in some cases we used UML comments in order to express additional information.
All relations (Object Properties) have a corresponding inverse relation but are not expressed in the models for brevity.
Person <inv-hasAuthor> Element
is shown in the model, therefore, you can assume that there is also a relation