Subject: [LC response] To Thorsten Liebig
Thank you for your comment
on the OWL 2 Web Ontology Language last call drafts.
The restriction on unnamed individuals not appearing in the axioms you mention is particular only to the OWL 2 DL variant of OWL. The structural specification, however, has been designed to capture OWL 2 ontologies beyond OWL 2 DL, and the same design principle has been applied to the OWL/XML syntax. In fact, an important design goal was to keep the two syntaxes in sync.
The OWL WG will therefore not make any changes to the OWL/XML syntax in response to this comment.
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According to the normative specification anonymous individuals cannot appear in the following axioms: SameIndividual, DifferentIndividuals, NegativeObjectPropertyAssertion, and NegativeDataPropertyAssertion. I suggest to bring this constraints into the XML Schema of OWL 2. Regards, Thorsten Liebig