PropertyValue
http://www.w3.org/1999/02/22-rdf-syntax-ns#type
http://www.w3.org/ns/prov#value
  • Because carbon dioxide is a green house gas and in recent times CO2 levels in the atmosphere have been increasing resulting in significant amount of carbon dioxide available for exchange into carbon sinks like our aquarium.
http://www.w3.org/ns/prov#wasQuotedFrom
  • tropicalfishkeeping.com