PropertyValue
http://www.w3.org/1999/02/22-rdf-syntax-ns#type
http://www.w3.org/ns/prov#value
  • A user interface including the tools described generally above may allow a user to restrict a search to specific content types, such as RSS, podcasts (which may be recognized, e.g., by presence of RSS with an MP3 or WAV attachment) or other OPML links within the corpus of OPML files searched.
http://www.w3.org/ns/prov#wasQuotedFrom
  • google.com