PropertyValue
http://www.w3.org/1999/02/22-rdf-syntax-ns#type
http://www.w3.org/ns/prov#value
  • Horizontal drilling techniques and advances in hydraulic fracturing, or fracking, developed in north Texas during the past 15 years have enabled energy producers to unleash oil and gas from rock formations such as shale.
http://www.w3.org/ns/prov#wasQuotedFrom
  • junkscience.com