PropertyValue
http://www.w3.org/1999/02/22-rdf-syntax-ns#type
http://www.w3.org/ns/prov#value
  • On the second question, I think if the message handling fails in some way you should return a structured and standard error response as a JSON message; only if there is a failure to deliver the message to the backend handler for some reason should you consider an HTTP error code.
http://www.w3.org/ns/prov#wasQuotedFrom
  • stackoverflow.com