Material Element	Ontology of Consumer Health Vocabulary	Source
http://sweet.jpl.nasa.gov/2.3/matrElement.owl#Metal	http://sbmi.uth.tmc.edu/ontology/ochv#C0025552	LOOM
http://sweet.jpl.nasa.gov/2.3/matrElement.owl#HeavyMetal	http://sbmi.uth.tmc.edu/ontology/ochv#C0347988	LOOM
http://sweet.jpl.nasa.gov/2.3/matrElement.owl#Halogen	http://sbmi.uth.tmc.edu/ontology/ochv#C0018544	LOOM
http://sweet.jpl.nasa.gov/2.3/matrElement.owl#TraceMetal	http://sbmi.uth.tmc.edu/ontology/ochv#46347	LOOM