PropertyValue
http://www.w3.org/1999/02/22-rdf-syntax-ns#type
http://www.w3.org/ns/prov#value
  • I am now curious why your command estimates[Keys] worked when I get an error: Cannot apply Keys to an expression of the form {__Association} -- would you please check to see if e.g. titanic[Keys] works on your system, using the definition from my answer?
http://www.w3.org/ns/prov#wasQuotedFrom
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