EuroVOTech Astronomical Objects	Nature.com subject ontology	Source
http://scigraph.springernature.com/things/subjects/x-rays	http://eurovotech.org/objects-structure.owl#XRays	LOOM
http://scigraph.springernature.com/things/subjects/interstellar-medium	http://eurovotech.org/objects-structure.owl#InterStellarMedium	LOOM