PropertyValue
http://www.w3.org/1999/02/22-rdf-syntax-ns#type
http://www.w3.org/ns/prov#value
  • Now, to address ???private.??? All e-mail can be forwarded, searched, and stored, so there is really no such thing as a private or confidential e-mail, no matter what high-end encryption functions your e-mail program might feature.
http://www.w3.org/ns/prov#wasQuotedFrom
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