About: http://webisa.webdatacommons.org/6674896

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	In a current prototype, the markers used have a diameter of about 1 mm, and for this reason there was a problem that markers of the lower layer were shielded by markers of the upper layer.
http://www.w3.org/ns/prov#wasQuotedFrom	google.de