メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.646588547047 43.9372230307277, 141.647408614038 43.9378321092657, 141.646969132195 43.9381515604042, 141.646350739906 43.9385953512825, 141.646121244713 43.9384396429949, 141.645514361213 43.9379823005717, 141.64470830336 43.9373747819783, 141.644378997223 43.9371163272831, 141.645427606669 43.9363794503752, 141.646588547047 43.9372230307277)) ^^http://www.opengis.net/ont/geosparql#wktLiteral