PropertyValue
http://www.w3.org/1999/02/22-rdf-syntax-ns#type
http://www.w3.org/ns/prov#value
  • is problems become notoriously thorny as traffic scales up: conventional databases break down at scale, and map/reduce frameworks such as Hadoop have a substantial developer and operational complexity burden.
http://www.w3.org/ns/prov#wasQuotedFrom
  • google.com