About: http://webisa.webdatacommons.org/272902697

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	There are numerous geometrical systems upon which stereotactic frame coordinates could be based. [0262] The four main types of frames developed to date include: (1) polar coordinate; (2) arc-radius; (3) focal point; (4) phantom target.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com