About: http://webisa.webdatacommons.org/5221158

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	For PCM, the switching element may be a metal oxide, such as hafnium oxide, aluminum oxide, tantalum oxide, niobium oxide, zirconium oxide, andyttrium oxide.
http://www.w3.org/ns/prov#wasQuotedFrom	patentgenius.com