メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.372829230647 43.7616188507076, 142.373171375515 43.7621921520717, 142.37161970567 43.762648337873, 142.371285194485 43.7620708584856, 142.370984156917 43.761501660063, 142.371914181901 43.7612353740285, 142.372523629582 43.7610543181537, 142.372829230647 43.7616188507076)) ^^http://www.opengis.net/ont/geosparql#wktLiteral