About: http://webisa.webdatacommons.org/402226942

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	Typical anionic Z groups include CO2 H, CO2 M, SO3 H, SO3 M, OSO3 H, OSO3 M, OPO(OH)2, and OPO(OM)2, wherein M is a metallic ion, such as sodium, potassium or calcium, or is ammonium or another such nitrogen-based cation.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com