PropertyValue
http://www.w3.org/1999/02/22-rdf-syntax-ns#type
http://www.w3.org/ns/prov#value
  • The set consisting of the null set -- {{ }} -- is also transitive: it has exactly one element, the null set, and that element is a subset of it because the null set is a subset of every set.
http://www.w3.org/ns/prov#wasQuotedFrom
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