About: http://webisa.webdatacommons.org/370445230

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	So start there and then with the knowledge about that look at what others have to say about e.g. PTGui (and remember, people tend to defend their own choices, not necessarily the best product ...).
http://www.w3.org/ns/prov#wasQuotedFrom	luminous-landscape.com