About: http://webisa.webdatacommons.org/411653934

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 top and bottom layers may be composed of sapphire, Pyrex, silicon or other accommodating material.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com