_:vb51205646	<http://www.w3.org/2007/05/powder-s#describedby>	<https://demo.openlinksw.com/about/id/entity/https/docs.ddialliance.org/DDI-Lifecycle/dev/output/ddi4.owl.ttl> .
_:vb51205646	<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>	<http://www.w3.org/2002/07/owl#Restriction> .
_:vb51205646	<http://www.w3.org/2002/07/owl#maxCardinality>	"1"^^<http://www.w3.org/2001/XMLSchema#integer> .
_:vb51205646	<http://www.w3.org/2002/07/owl#onProperty>	<http://rdf-vocabulary.ddialliance.org/lifecycle#effectivePeriod> .