About: http://webisa.webdatacommons.org/87519371

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	@JNat atlantiza's link will answer your question :) it is sort of confusing if you think about it too hard, but IMO which four reading to use is one of those things you will learn best learned by listening/getting a feel for it.
http://www.w3.org/ns/prov#wasQuotedFrom	stackexchange.com