About: http://webisa.webdatacommons.org/221418614

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	However, the second method has a disadvantage that the glass article contains materials other than silica and fluorine although it can realize the refractive index profile.
http://www.w3.org/ns/prov#wasQuotedFrom	google.fr