About: http://webisa.webdatacommons.org/300840064

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	A volume grating is a so-called thick grating in which the grating structure extends across the thickness of the grating plate and is not only provided on the surface as is the case with a thin grating.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com