About: http://webisa.webdatacommons.org/22751597

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	They can have any shape, and in particular a circular or polygonal (square, hexagonal or octagonal) cross section depending on the specific application envisaged.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com