メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.371603457593 43.7658154927484, 142.371906406624 43.7663681985069, 142.370421032848 43.7667939392326, 142.370116523746 43.7662438531453, 142.369791716896 43.7656571853943, 142.371280341135 43.7652260287822, 142.371603457593 43.7658154927484)) ^^http://www.opengis.net/ont/geosparql#wktLiteral