About: http://webisa.webdatacommons.org/408265817

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	variable friction surfaces. Similarly, the tracks may be provided with devices such as loops or roller coasters or with obstacles. Additionally, the tracks may take circular or other non-straight linear forms.
http://www.w3.org/ns/prov#wasQuotedFrom	docstoc.com