PropertyValue
http://www.w3.org/1999/02/22-rdf-syntax-ns#type
http://www.w3.org/ns/prov#value
  • The electrodes can be excited by alternating current of either sine wave, square wave, or other wave shape as deemed effective, with the ???hot??? electrode being either positive or negative with respect to the ???ground??? electrode at any given instant of the alternating current cycle even though the ground electrode is always connected to electrical ???earth??? ground.
http://www.w3.org/ns/prov#wasQuotedFrom
  • google.com