About: http://webisa.webdatacommons.org/28312617

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	It currently lists 495 classes, including PPAD, as you mention, and a large diagram of some of the classes. share|improve this answer edited Mar 6 '14 at 6:13
http://www.w3.org/ns/prov#wasQuotedFrom	mathoverflow.net