About: http://webisa.webdatacommons.org/175982633

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	Such glasses typically can contain additionally at least one alkali or alkaline earth metal oxide, such as sodium oxide, potassium oxide, calcium oxide, magnesium oxide, and the like.
http://www.w3.org/ns/prov#wasQuotedFrom	google.co.uk