About: http://webisa.webdatacommons.org/414214300

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	It is to make sure that grouping by two columns means that in the result set both of the columns other than your aggregate functions are to be shown.
http://www.w3.org/ns/prov#wasQuotedFrom	crunchmodo.com