About: http://webisa.webdatacommons.org/262379183

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 are used for certain 'saddle' connections, on bends or other fittings, and for connecting to an existing socketed system.
http://www.w3.org/ns/prov#wasQuotedFrom	pavingexpert.com