About: http://webisa.webdatacommons.org/50716680

Property	Value
http://www.w3.org/1999/02/22-rdf-syntax-ns#type	http://www.w3.org/ns/prov#Entity
http://www.w3.org/ns/prov#value	The marker is preferably formed of a radiopaque material such as gold, tantalum, platinum, iridium, or other high density metal or material or any combination thereof; such that it will be visible under fluoroscopic examination.
http://www.w3.org/ns/prov#wasQuotedFrom	google.ca