About: http://webisa.webdatacommons.org/109565295

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	I agree with @Joren that one of the most important parts is that it is telling you where you are taking those deltas from, in the case of dx, with respect to x.
http://www.w3.org/ns/prov#wasQuotedFrom	stackexchange.com