メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.360480175913 43.7836888122375, 142.359799285216 43.7841898602741, 142.359149871856 43.7846592470952, 142.357509055694 43.7834759042688, 142.35757035921 43.7834307176099, 142.358169840491 43.7829888307779, 142.358853354862 43.782492311784, 142.360480175913 43.7836888122375)) ^^http://www.opengis.net/ont/geosparql#wktLiteral