About: http://webisa.webdatacommons.org/263247404

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	instead of making dates can we do something in where clause ... i think we can also use ! (NOT )operator to find missing dates and can union two - one for dates and other for missing dates
http://www.w3.org/ns/prov#wasQuotedFrom	stackoverflow.com