PropertyValue
http://www.w3.org/1999/02/22-rdf-syntax-ns#type
http://www.w3.org/ns/prov#value
  • Implementing a double opt-in process???sending those who have opted in an e-mail in response requiring them to take an action such as clicking a link embedded in said e-mail in order to confirm that they really do want to be put on the house file and didn???t just misunderstand the form???dramatically reduces the likelihood of recipients??? reporting subsequent e-mails as spam.
http://www.w3.org/ns/prov#wasQuotedFrom
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