PropertyValue
http://www.w3.org/1999/02/22-rdf-syntax-ns#type
http://www.w3.org/ns/prov#value
  • Here at Google, we are getting ready to celebrate Pi Day, which culminates tomorrow, March 14 at 1:59pm, a date and time that correspond to the first six digits of pi: 3.14159. (Some people celebrate at 1:59am.) Of course, since pi is a member of a select group of irrational numbers, meaning they can not be expressed as a fraction, there are an infinite number of digits in pi.
http://www.w3.org/ns/prov#wasQuotedFrom
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