About: http://webisa.webdatacommons.org/346018658

Property	Value
http://www.w3.org/1999/02/22-rdf-syntax-ns#type	http://www.w3.org/ns/prov#Entity
http://www.w3.org/ns/prov#value	Empty strings and strings consisting of only white space need to be surrounded by quotes, so they are recognized as something other than null.
http://www.w3.org/ns/prov#wasQuotedFrom	codeproject.com