PropertyValue
http://www.w3.org/1999/02/22-rdf-syntax-ns#type
http://www.w3.org/ns/prov#value
  • Pregnancies consisting of multiples, such as twins or triplets, count as one birth for the purpose of this notation.
http://www.w3.org/ns/prov#wasQuotedFrom
  • clinicaltrials.gov