PropertyValue
http://www.w3.org/1999/02/22-rdf-syntax-ns#type
http://www.w3.org/ns/prov#value
  • Outlook is the biggest offender, especially for business messages sent from a a Gmail address on behalf of a custom domain.Some suggested that Gmail should stop including the primary email address in the headers, but he is a major faux pas, since Gmail needs to authenticate the messages sent using its SMTP servers.
http://www.w3.org/ns/prov#wasQuotedFrom
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