Material Element	Galen Ontology	Source
http://sweet.jpl.nasa.gov/2.3/matrElement.owl#Metal	http://www.co-ode.org/ontologies/galen#Metal	LOOM
http://sweet.jpl.nasa.gov/2.3/matrElement.owl#HeavyMetal	http://www.co-ode.org/ontologies/galen#HeavyMetal	LOOM
http://sweet.jpl.nasa.gov/2.3/matrElement.owl#TransitionMetal	http://www.co-ode.org/ontologies/galen#TransitionMetal	LOOM