PropertyValue
http://www.w3.org/1999/02/22-rdf-syntax-ns#type
http://www.w3.org/ns/prov#value
  • Subject: This is your subject field There are a few extra additions marked on there, mainly stating from where the message was received (the mail client, when it identified itself to the mail server) and the time it was received, along with a message ID. The message ID has no human-based significance, but from an administrative standpoint, a mail administrator can use it to look up emails.
http://www.w3.org/ns/prov#wasQuotedFrom
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