PropertyValue
http://www.w3.org/1999/02/22-rdf-syntax-ns#type
http://www.w3.org/ns/prov#value
  • Although terrestrial plants, animals, and microbes are a source for more than half of the medicinal drugs on the market today, technical difficulties and a lack of knowledge on the marine environment have prevented scientists and researchers from exploring marine life fully.
http://www.w3.org/ns/prov#wasQuotedFrom
  • nationalacademies.org