Tephra M4M Example	Ontology for Geography Markup Language (GML3.0)	Source
http://loki.cae.drexel.edu/~wbs/ontology/2004/09/ogc-gml#Surface	https://example.com/tephra/vocs/m4m-tephra/surface	LOOM
http://loki.cae.drexel.edu/~wbs/ontology/2004/09/ogc-gml#_Surface	https://example.com/tephra/vocs/m4m-tephra/surface	LOOM