METPO	Ontology for Geography Markup Language (GML3.0)	Source
https://w3id.org/metpo/0000229	http://loki.cae.drexel.edu/~wbs/ontology/2004/09/ogc-gml#_Ring	LOOM
https://w3id.org/metpo/0000229	http://loki.cae.drexel.edu/~wbs/ontology/2004/09/ogc-gml#Ring	LOOM