PDS4 Information Model Classes	Nature.com subject ontology	Source
http://ontology.pds.nasa.gov/pds/0001_nasa_pds_1/pds/product_components/pds/target_identification	http://scigraph.springernature.com/things/subjects/target-identification	LOOM
http://ontology.pds.nasa.gov/pds/0001_nasa_pds_1/pds/tndo_context/pds/agency	http://scigraph.springernature.com/things/subjects/agency	LOOM