PropertyValue
http://www.w3.org/1999/02/22-rdf-syntax-ns#type
http://www.w3.org/ns/prov#value
  • The key is to avoid having any 'silent' clients in the first place - so contacting them regularly, even if it is just a 'hello, hows things going?' should be a high priority, especially as it is easier to sell to existing customers.
http://www.w3.org/ns/prov#wasQuotedFrom
  • sitepoint.com