About: http://webisa.webdatacommons.org/175616435

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	Upper layer 1301 and lower layer 1303 can be made of film as described above, but are preferably made of a rigid material, such as glass or rigid plastic.
http://www.w3.org/ns/prov#wasQuotedFrom	google.es