About: http://webisa.webdatacommons.org/102457142

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	Although the notch is illustrated as substantially rectangular in cross-section, it is recognized that the notch may be any shape or cross-section such as semi-circular as shown in FIG. 2A.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com