About: http://webisa.webdatacommons.org/30406753

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	If the ion is hydrogen, or calcium or other polyvalent ion, the clays do not swell nearly so much in water, but are, however, considered a type of gel-forming solid for the purposes of this invention.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com