About: http://webisa.webdatacommons.org/79532136

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	As for the Rails application error you were encountering, Rails is a web application framework used to build websites, not the Calibre desktop app. So it is actually the website throwing an error, not the app.
http://www.w3.org/ns/prov#wasQuotedFrom	mobileread.com