About: http://webisa.webdatacommons.org/172904740

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	Such materials are well known in the art and include, for example, hydroxyethylmethylacrylate (HEMA), a hydrogel such as polyvinyl pyrrolidone, water, contrast media or saline.
http://www.w3.org/ns/prov#wasQuotedFrom	google.co.uk