About: http://webisa.webdatacommons.org/3559849

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 described above, one example is an empty element that is required and another example is where a number data type such as an Integer data type is required and the user does not enter data to the cell.
http://www.w3.org/ns/prov#wasQuotedFrom	google.fr