About: http://webisa.webdatacommons.org/163775940

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	Without installing anything, you can navigate to e.g. https://docs.google.com/viewer?url=www.math.harvard.edu/~seths/lecture1.pdf&embedded=TRUE where www.math.harvard.edu/~seths/lecture1.pdf is the URL of the PDF you are trying to view.
http://www.w3.org/ns/prov#wasQuotedFrom	superuser.com