PropertyValue
http://www.w3.org/1999/02/22-rdf-syntax-ns#type
http://www.w3.org/ns/prov#value
  • Blockexplorer has a way to view the current balance of an address, i.e. payments to minus payments out of an address.
http://www.w3.org/ns/prov#wasQuotedFrom
  • bitcointalk.org