PropertyValue
http://www.w3.org/1999/02/22-rdf-syntax-ns#type
http://www.w3.org/ns/prov#value
  • Even though it is a bit dated since I think the most recent edition is about twenty years old now, it is a really good brief explanation of historical UUism as well as pretty representative of the diversity of beliefs among UU's today.
http://www.w3.org/ns/prov#wasQuotedFrom
  • beliefnet.com