About: http://webisa.webdatacommons.org/291602680

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	So, if you look at the carbon of an old substance and see a nitrogen atom where you would expect to see a carbon atom, then you infer that there was a carbon there once.
http://www.w3.org/ns/prov#wasQuotedFrom	fnal.gov