About: http://webisa.webdatacommons.org/218252786

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 two optical diffraction gratings may also be present inside the waveguiding layer, e.g. beneath the surface thereof.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com