About: http://webisa.webdatacommons.org/273357707

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 would imagine it is because you are not just buying the e-book, but you are paying Overdrive to manage the collection, including the checking the book in and out.
http://www.w3.org/ns/prov#wasQuotedFrom	mobileread.com