About: http://webisa.webdatacommons.org/429371208

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	it is not necessary, other oxides including P2O5, Na2O, B2O3, K2O, MgO, Al2O3, TiO2,
http://www.w3.org/ns/prov#wasQuotedFrom	google.es