About: http://webisa.webdatacommons.org/140108204

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	Any observer, such as A, should have taken part in at least two distinct events, such as $\!{\mathscr J}$ and ${\mathscr Q}$. (The corresponding indications of observer A I will denote as A$\!_{\mathscr J}$ and A$\,\!_{\mathscr Q}$.)
http://www.w3.org/ns/prov#wasQuotedFrom	stackexchange.com