About: http://webisa.webdatacommons.org/248635987

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	With reference back to FIG. 3, at a step S306, the boundary-extraction unit 207 extracts boundaries of document elements such as characters and other symbols based on the features around edges between adjoining polygons.
http://www.w3.org/ns/prov#wasQuotedFrom	google.co.uk