_:vb899631	<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>	<http://www.w3.org/2002/07/owl#Class> .
_:vb899631	<http://www.w3.org/2002/07/owl#unionOf>	_:vb899633 .
<http://purl.org/ontology/bibo/doi>	<http://www.w3.org/2000/01/rdf-schema#domain>	_:vb899631 .