A possible error in Prov-O RDF

Greetings,
On line 27 of the TTL formatted version of the Prov-O RDF I found the following line:
owl:Thing  rdf:type owl:Class ;  rdfs:subClassOf owl:Thing ;.
I believe this is an error.  If it isn't an explanatory note describing its purpose would be helpful.
Thanks in advance,
Kevin

Kevin P. Tyson | Executive Director | JPMorgan Chase | Office of Legal Obligations
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Received on Thursday, 12 October 2017 08:30:55 UTC