About: http://webisa.webdatacommons.org/262516847

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 gaps 401 may be filled with a fluid, such as air, gas or a liquid, or with other materials, such as glasses or oxides having a desired refractive index, or they may be emptied to create vacuum thereinside.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com