PropertyValue
http://www.w3.org/1999/02/22-rdf-syntax-ns#type
http://www.w3.org/ns/prov#value
  • ???There are a lot of resource plays in the Cretaceous shales and surrounding tighter rocks that are in the oil window ??? people are drilling those because they???re shallower and there are plenty of them.???
http://www.w3.org/ns/prov#wasQuotedFrom
  • aapg.org