PropertyValue
http://www.w3.org/1999/02/22-rdf-syntax-ns#type
http://www.w3.org/ns/prov#value
  • Though the more I think of it, the more it feels like SHA hash of the empty string, if it exists, actually would be a well-defined identifier for an empty tree, unless it would be impossible to tell whether that object is a tree or a blob.
http://www.w3.org/ns/prov#wasQuotedFrom
  • stackoverflow.com