PropertyValue
http://www.w3.org/1999/02/22-rdf-syntax-ns#type
http://www.w3.org/ns/prov#value
  • it is important that implementations do not use safe methods (e.g. GET and HEAD) to perform unsafe operations (e.g. writing data). [???] since HTTP defines GET as "safe, caches and other proxies will assume (based on the spec) that it is fine to perform pre-fetch on these URIs and/or cache and replay the responses as needed.
http://www.w3.org/ns/prov#wasQuotedFrom
  • infoq.com