Create an instance of Hybrid with ID "Prius". Give it a property called "paintColor" and assign it a value of "Red".
Validate the document. Note that two markers appear in the Problems view.
Click on the Unknown Property marker. The paintColor property is selected in the editor, indicating that it is the cause of the error. The other error indicates that a Hybrid must include a vehicle-ont#wheelCount. Delete the paintColor tag and in its place add a veh:wheelCount with a value of 4.
Validate the document again. The errors disappear from Problems view because they have been resolved.
OWL Editors and Visualizers
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Using the RDF-XML Editor
Validating OWL Content