About: http://webisa.webdatacommons.org/292420527

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	One type of standard requires fabrication of a model heel structure, or phantom, such as an epoxy-resin matrix filled with a fluid, or an epoxy resin filled with particles of another material such as tungsten powder or glass beads.
http://www.w3.org/ns/prov#wasQuotedFrom	google.es