About: http://webisa.webdatacommons.org/404921476

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	Nikon and Canon are not systems - they are camera makers that sell cameras for several systems, most of which are sorely lacking in lenses and other accessories.
http://www.w3.org/ns/prov#wasQuotedFrom	dpreview.com