DRC IEPAL gregory.zacharewicz@lsis.org Classes and Properties comprising the OWL Web Ontology Language DRC 2002-10-17 text/xml en ShuttleMission a Shuttle mission defined all the data about a spatial mission of a shuttle Milestone Milestone defined all the data about a spatial mission scheduling Launch Launch defined all the data about a spatial mission launch Landing Launch defined all the data about a spatial mission landing Orbit Orbit defined all the data about a spatial mission orbit