About: http://webisa.webdatacommons.org/139609301

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	Is there a practical tool to modify (with eraser and pen) a pdf file whose content is a scanned document or a picture taken by a digital camera?
http://www.w3.org/ns/prov#wasQuotedFrom	stackexchange.com