About: http://webisa.webdatacommons.org/120612201

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	In addition to polycrystalline and monocrystalline alpha-alumina, other ceramics may also be used, such as porcelain, glass, glass-ceramics and the like.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com