The OWL Validator can only be activated if an OWL file is currently selected in the URI Explorer. Once selected, an OWL file can be validated by either right-clicking the file and selecting Validate or by pressing the Validate button, , on the toolbar.
Any validation errors or warnings returned by the OWL Validator will be added to the Tasks view and marked in the file. Some validation errors and warnings do not apply to specific statements within the document are not marked in the file.
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Creating a New OWL Document
Using the URI Explorer
Using the RDF-XML Editor for OWL