PropertyValue
http://www.w3.org/1999/02/22-rdf-syntax-ns#type
http://www.w3.org/ns/prov#value
  • Companies like Postini, MessageLabs, MX Logic and Frontbridge Technologies intercept inbound e-mail on behalf of their customers, then filter out spam, viruses and other unsuitable messages before sending the remaining e-mail messages on to the customer e-mail server and the message's intended recipient.
http://www.w3.org/ns/prov#wasQuotedFrom
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