EPNcore Target Classes IVOA Unified Astronomy Thesaurus (IVOA rendering) Source
http://www.ivoa.net/rdf/uat#interplanetary-medium http://voparis-ns.obspm.fr/epn/target_class#interplanetary_medium LOOM
http://www.ivoa.net/rdf/uat#calibration http://voparis-ns.obspm.fr/epn/target_class#calibration LOOM